MOHAMED Slamani

Korichi Leila , Zouak Anfal

DEVELOPPEMENT D’UN PROTOCOLE METROLOGIQUE SUR MMT POUR L’ANALYSE DES SPECIFICATIONS GEOMETRIQUES DES PIECES MECANIQUES

BIDI Tarek

RETROCONCEPTION DES PIECES DE FORMES COMPLEXES

OGBI AYMEN , SALAMANI LAID

Etude de l'usinabilité des composites à fibres naturelles

SAADALLAH Aboubakr , FAID Hadj

ANALYSE & RETRO-INGENIERIE DU NUAGE DE POINTS

ARSLANE Mustapha

CONTRIBUTION A L’USINAGE DES PIECES DE FORMES COMPLEXES SUR MACHINE-OUTIL A COMMANDE NUMERIQUE

Ahlem Mechta

Contribution à l’amélioration de la performance des machines-outils à commande numérique

BOURAS Youcef , KORICHI Farid

Développement d'un matériau composite à base de fibres d'Alfa

DJAHEL Elaid , ABBOU Abdallah

Modélisation des erreurs de positionnement induites thermiquement d’une articulation prismatique d’une machine-outil à commande numérique.

AZZOUZ Saliha

Étude de la relation entre les écarts angulaires et les écarts de rectitudes d’un axe prismatique d’une machine-outil à commande numérique.

BRIK Mounir , LAZIRI Lakhdar

OPTIMISATION DU PLACEMENT DES ELEMENTS D'APPUI SUR LES PIECES A USINER POUR MINIMISER LES ERREURS DE MONTAGE ET DE MAINTIEN

SALAMANI Messaoud , BELAID Soufiane

EVALUATION DE LA QUALITE ET DE LA REPETABILITE DE POSAGE D’UN MONTAGE D'USINAGE DEDIE A LA FABRICATION DES AILETTES MOBILES D'UNE TURBINE A GAZ

MAHDADI Mohamed , BOUAFIA Hichem

ETUDE COMPARATIVE DES INDICES D’OBSERVABILITE POUR L’ETALONNAGE DES ROBOTS

CHIKH Aissa

Etalonnage Géométrique d’un Robot

This study presents a method for modelling, predicting, and evaluating the impact of drill materials on the drilling process of hybrid palm/jute polyester composites, with the aim of enhancing hole quality regarding delamination, circularity, and cylindricity. Three drill materials, including High-Speed Steel (HSS), 5% Cobalt-coated High-Speed Steel (HSS-Co5), and Solid Carbide drills were tested, and their impacts on drilling performance were assessed. Through thorough experimentation and statistical analysis, significant differences in results were observed between HSS drills and both HSS-Co5 and Solid Carbide drills. However, the variation in results between HSS-Co5 and Solid Carbide drill results was minimal. Additionally, the findings highlight notable disparities among drill types concerning uncertainty. The results also indicate that feed rate, drill material, and their interaction play crucial roles in determining drilling efficiency. Specifically, HSS drills consistently outperformed HSS-Co5 and Solid carbide drills, demonstrating superior performance in minimizing delamination, improving circularity, and enhancing cylindricity along with lower uncertainty. Keywords Composite drilling Hybrid palm/jute polyester composites Drill materials Hole quality Uncertainty analysis

Citation

Mohamed SLAMANI , ARSLANE Mustapha , , (2024-08-26), Investigating the Impact of Drill Material on Hole Quality in Jute/Palm Fiber Reinforced Hybrid Composite Drilling with Uncertainty Analysis, Heliyon, Vol:2, Issue:3, pages:22222-333222, ELSEVIER

In the manufacturing industry, Mastercam X5 is a widely used CNC simulation and programming suite that offers high efficiency. It can be easily integrated with the Mastercam model, providing full associativity and seamless single-window integration. The iMachining technology, which uses patented algorithms for specific operations, is a breakthrough in CNC milling tool path technology. It optimizes the tool path, reduces machining time, and minimizes tool wear. The suite enables a wide range of machining operations on various stock objects, making it flexible and versatile. The simulation process allows real-time observation of operations and ensures error-free G-code for physical operation. This paper details the procedures of machining a spur gear from stock material using Mastercam 2D iMachining technology. The simulation process generates automatic Gcodes for practical use in CNC machines. Mastercam simplifies the concept, operation, and importance of using CAM software in modern-day manufacturing industries. It also enables optimization of operational steps and parameter details to save time, cost, and tool lives, improving overall efficiency.

Citation

Mohamed SLAMANI , SAID Zergane , SALAH Amroune , Moussa ZAOUI , Chouki FARSI , , (2023-11-24), G-CODE GENERATION FOR MACHININING SPUR GEAR IN CNC MACHINES USING THE IMACHINING STRATEGY, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING, Vol:21, Issue:4, pages:49-57, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING

This study is a mathematical and geometric proof of the expression of the micro- and nanohardness of thin coating resulting from the indentation of a needle form of a cone tip. It is geometric and mathematical modeling of the indentation of the monolayer solid material, where approaches to the coefficients of the model of surfaces mixture are presented. Firstly, formulations of hardness indentations of the composite and the substrate of the mono-layer-coated material have been established. Then, the hardness formula of the thin film of the coating material was derived from the additive law of mixtures. The project imprint result from the indentation of the cone tip on a plane surface is considered as a disk form and the coefficients ߙ and ߚ are ratios of circle surfaces. The hardness of the composite and the substrate of the coating material are expressed as functions of the imprint projected dimensions and the applied load. The contribution of the film to the composite hardness is determined by the model of the surfaces – low mixture of the area – low mixture model. Finally, the expression of the hardness film becomes a function of the composite hardness, the indenter dimension, the imprint dimension, and the film thickness.

Citation

Mohamed SLAMANI , Aissa BOUDILMI , Messaoud TITOUM , KHALED Bouchareb , K. Loucif, , (2023-10-13), NEW METHOD FOR THE MICRO- AND NANOHARDNESS MEASUREMENT OF THIN FILM OF MONOLAYER SOLID BY THE INDENTATION OF A SHARP NEEDLE OF A CONE TIP, Strength of Materials, Vol:55, Issue:4, pages:800-813, Springer

Components and sub-assemblies of machinery and equipment will wear out over time and leads to their destruction and hence production downtime. The easiest and fastest way to overcome this problem is to replace these elements with a new one. However, the problem arises when the desired element is not available on the market, the technical documentation is not available or the costs of obtaining a new item are too high. A good example of this situation is the industrial problem related to the halt in the spare parts caused by the closure due to the global spread of the Corona virus. To overcome these problems, reverse engineering can be used. The best solution is to replicate the desired part digitally. The purpose of this paper is to solve an industrial problem related to lack of spare parts such as tram transmission gear. The CAD model of this component is not available, but the finished part (physical part) is available for reverse engineering. The 3D scanning of the gear was carried out using a FARO LASER ARM (Non-contact scan) and the obtained point cloud was processed using CAM2 MEASURE 10, CATIA V5.R20 and MATLAB software for surface approximation and geometrical modeling of scanned part. The CAD model built and the digital version obtained could be used to continue the reconstruction process and also allows improvements to be made to the part without generating any additional cost.

Citation

Mohamed SLAMANI , Aboubakr Saadallah, Hadj Faid, Jean-François Chatelain, , (2023-10-01), REVERSE ENGINEERING OF TRAM TRANSMISSION GEAR, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING, Vol:21, Issue:3, pages:110-117, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING

The accuracy of a machine tool can be significantly impacted by thermal deformation, which is a type of thermal error. Thermally induced positioning errors can occur due to temperature variations that cause the materials in a machine tool to expand or contract, leading to dimensional changes that affect the accuracy of position measurements. Laser interferometer measurements can be used to detect these errors by comparing the actual position of a component to its expected position based on a reference measurement. To control the thermally induced positioning error of machine tools, a mathematical model that describes the relationship between temperature and positioning errors is proposed in this paper. The proposed model is based on empirical data collected from laser interferometer measurements and then used to predict the magnitude of the errors under different thermal conditions. A set of tests was conducted to confirm the thermal model's validity. The excellent match between the experimental data and the calculated values provides evidence supporting the possibility of using the suggested approach for estimating the thermal performance of CNC machine tools.

Citation

Mohamed SLAMANI , SALAH Amroune , , (2023-10-01), ANALYSIS AND MODELING OF THERMALLY INDUCED POSITIONING ERRORS BASED ON LASER INTERFEROMETER MEASUREMENTS, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING, Vol:21, Issue:3, pages:27-33, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING

In this paper, the effect of the winding angle and the number of folds on the delamination behavior of vinyl ester resin-fiberglass composites under mode-I loading was investigated experimentally. Accordingly, double cantilever beam samples with 8 and 12 folds and with different winding angles (±45°, ±55° and ±65°) were cut out of industrial pipes and subjected to mechanical tests. Furthermore, thick films were introduced during the winding process to create initial cracks of 50mm. The Mode-I fracture tests were conducted according to ASTM D5528-94a standards. Results show that the [±65°] winding angle provides the best delamination behavior and greater resistance to cracking compared to the [±55°] and [±45°] winding angles. Results also show that the number of folds has no effect on the initiation of the crack stage, but it significantly affects the propagation stage.

Citation

Mohamed SLAMANI , Hocine MAKRI , SELMA Baali , , (2023-10-01), COMPREHENSIVE STUDY OF THE DELAMINATION OF GLASS-FIBER BASED COMPOSITES, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING, Vol:21, Issue:3, pages:61-68, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING

The aim of this work to explore the absorption behavior of bio composites reinforced with date palm fibers. RSM and ANOVA were utilized to evaluate the impact and interdependence of input variables (Time: from 24 h to 672 h, Fiber content: 15 %, 20 %, and 25 %, and types of water: seawater, distilled water, and rainwater) on the output variables (Mass of CDPF) during a water absorption process that lasted more than 670 h at 23 ◦C. The findings revealed that the bio composites with the above-mentioned filler content absorbed more water as the amount of fibers increased, with absorption rates of 14.03 %, 19.39 %, 30.94 % for seawater, 15.42 %, 20.64 %, and 36.08 % for distilled water, and 16.37 %, 21.98 %, and 42.10 % for rainwater, respectively. Additionally, the study measured the diffusion coefficient of bio composites, which had a minimum value of about 2.11 × 10− 6mm2/s and a maximum value of about 3.99 × 10− 6mm2/s. The results of RSM model analysis showed that this model is accurate and reliable. Where the values of R2 and adjusted R2 coefficients for the Mass of CDPF were 99.63 % and 99.61 %, respectively, indicating an ideal match between experimental and predicted values. These findings provide valuable information for engineers interested in incorporating date palm fiber bio composites during development and implementation.

Citation

Mohamed SLAMANI , , (2023-08-22), Modelling and optimization of the absorption rate of date palm fiber reinforced composite using response surface methodology, Alexandria Engineering Journal, Vol:79, Issue:, pages:545-555, Elsevier

Nowadays, with regard to many environmental problems, the development of environmentally friendly materials such as natural fiber composites is a real alternative to synthetic fibers. They have many interesting advantages such as their availability, their low cost, their low density, their biodegradable character, their specific resistance properties and their low impact on the environment. The present paper is aimed at fabricating and machining of an epoxy composite material reinforced with Alfa (Stipa tenacissima L.) fibers. The full factorial analysis was used to assess the effect of cutting parameters such as cutting velocity and feed rate on the arithmetic roughness Ra of machined surfaces obtained by down milling and up milling operations. For this purpose, a two flutes high-speed steel (HSS) cutting tool was used. The results showed that the up milling mode provides better surface roughness than down milling mode for almost all machined specimens. The feed rate is the main factor affecting the surface roughness, with a contribution of about 90%. The worst values of arithmetic roughness were observed, at low feed rate (0.05 mm/rev) regardless of the cutting velocity. The results also showed that machining parallel to fibers direction (0°) offers better surface roughness than machining perpendicular to fibers direction (90°). Microscopic and SEM images show some defects such as matrix cracking, cavity, fibers breakage, loss of matrix, fluffing, and thermal damage.

Citation

MADANI Grine , Mohamed SLAMANI , ARSLANE Mustapha , MANSOUR Rokbi , , (2023-08-16), Investigation of the machining behavior of unidirectional Alfa (Stipa tenacissima L.)/epoxy composite material, The International Journal of Advanced Manufacturing Technology, Vol:128, Issue:, pages:3183–3196, Springer

Composite material consumption is booming and is expected to increase exponentially in many industrial applications such as aerospace, automotive, marine and defense. However, in most cases, composite products require further processing before they can be used or assembled. Machining of composite materials is extremely difcult due to their anisotropic and non-homogeneous structure. This paper provides a comprehensive review of the literature on composite materials and their machining processes, such as turning, milling and drilling. Damage related to these processes is also discussed. The paper is divided into seven main parts; the frst, second and third parts give a brief overview of composite materials, reinforcements used in composite materials and composite manufacturing methods, respectively. The fourth part deals with post-processing machining operations, while the ffth, sixth and seventh parts are devoted to the machining of carbon fber reinforced polymer composite, glass fber reinforced polymer and natural fber reinforced polymer composites, respectively. An analysis of the factors that infuence the machining and the machinability criteria used for these materials is also presented, with particular emphasis on cutting forces, tool wear, delamination and surface fnish. Non-traditional manufacturing methods are not discussed in this paper.

Citation

Mohamed SLAMANI , Jean‑François Chatelain, , (2023-04-03), A review on the machining of polymer composites reinforced with carbon (CFRP), glass (GFRP), and natural fbers (NFRP), Discover Mechanical Engineering, Vol:2, Issue:4, pages:24, Springer

The This work studies the drilling performance of bio composites reinforced with cellulosic fibres. The drilling was carried out at three spindle speeds and at three feed rates using three dissimilar drills namely: HSS-TITAN, HSS-CARBIDE, and HSS-SUPER. The drilling performance was evaluated in terms of the delamination factor which was determined using the free software image J. The results showed that the value of this factor decreased with increasing spindle speed and increased with increasing feed rate. On the other hand, the HSSSUPER drill causes less delamination than the other two drills. To predict the delamination value, the artificial neural network (ANN) method was used. The best hole quality was obtained when using the HSS-SUPER drill, with a spindle speed of 2200 rpm and a feed rate of 40 mm/rev. The worst case was brought when using an HSS-carbide drill, with a spindle speed of 500 rpm and a feed rate of 120 mm/ rev

Citation

Mohamed SLAMANI , SALAH Amroune , Riyadh benyettou , Ali KILIÇ, , (2023-01-15), INVESTIGATION OF MACHINABILITY OF BIOCOMPOSITES: MODELING AND ANN OPTIMIZATION, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING, Vol:21, Issue:1, pages:97-104, ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING

The present article attempts to study absorption properties of bio-composites reinforced with date palm fibers. The effect of fiber loading on water absorption at room temperature 25°C was investigated. The weight gain was measured of bio-composites immersed in distilled water, seawater and rainwater, for more than 670 hours, until reaching the saturation with a measurement interval between 24 and 48 hours. To understand absorption phenomenon, scanning electron microscopy was used. Porosity rate was determined using image J software. It was noted the water absorption rate of the bio composites reached 16.20%, 16.33%, 21.94%, 41.99% for seawater, 16.41%, 16.52%, 20.84%, 30.08% for distilled water, and 14.00%, 14.04%, 19.30%, 36.94% for rainwater, respectively. The absorption increases when increasing fiber content. The diffusion coefficient of bio-composites has minimum and maximum values of about 1.94 × 10−6mm2/s and 3.99 × 10−6mm2/s, respectively. Palm fibers are highly porous. The porosity value was higher than 51%. To predict the absorption rate, artificial neural network method was used. The ANN models obtained are very well correlated with the experimental data where the values of the correlation coefficient of the datasets are all beyond 0.99 and the average error value was estimated at 3 × 10−5.

Citation

Mohamed SLAMANI , Riyadh benyettou , SALAH Amroune , Yasemin Seki, Alain Dufresne, , (2022-10-25), Experimental Investigation of the Absorption Behavior of Date Palm Fiber Reinforced Iso-Polyester Composites: Artificial Neuron Network (ANN) Modeling, Journal of Natural Fibers, Vol:19, Issue:17, pages:15902-15918, Taylor & Francis

This paper presents an experimental study conducted to assess the correlation between the intra-axis errors of prismatic axes for CNC machine tools. The validity and reliability of parametric models for the modeling of intra-axis errors (IAEs) of CNC machine tools in the context of indirect calibration are also assessed in this work. Three CNC machine tools with various controllers and guidance technologies were tested using two diferent measuring instruments. Two predictive models, namely Bézier and B-spline curves, are described and compared for the frst time in this work. Both models are experimentally evaluated for accuracy and predictive efciency using four evaluation criteria and new data sets from the three tested CNC machine tools. Results show a strong correlation between the positioning errors and the pitch and yaw errors for all the tested machines. The results also show that both proposed models are appropriate for the modeling of intra-axis errors, with the B-spline curves coming slightly on top in terms of performance. Moreover, with the same number of control points (n=5), the two models provide residuals that are lower than the repeatability of the machine for most intra-axis errors tested. This experimental study thus confrms that a Bézier model of degree four and a B-spline model of degree two, both with fve control points, are sufcient to represent the intra-axis errors for the tested CNC machine tools.

Citation

ahlem MECHTA , Mohamed SLAMANI , , (2022), Correlation assessment and modeling of intra axis errors of prismatic axes for CNC machine tools, The International Journal of Advanced Manufacturing Technology, Vol:120, Issue:, pages:5093–5115, Springer

Flax fiber-reinforced polymer composites are an interesting alternative to synthetic fiber-reinforced polymer composites for many engineering applications. When machining flax fiber-reinforced composite materials that are by definition heterogeneous, the matrix and the fibers react differently and hence many sorts of damage may occur such as poor surface roughness, delamination, and fluffing. The novelty of the current work lies in identifying the major factors that affect the quality of the milled surface of composites reinforced with flax fibers and provides recommendations and collaborative solutions to the composite machining community. In this study, the impact of cutting conditions (cutting speed, feed rate, and fiber orientation) on the cutting forces and surface roughness during milling of the flax/epoxy composite is investigated. For this purpose, slotting tests are performed on flax fiber-reinforced polymer plates using a carbide end mill tool based on a full factorial design of experiment. Furthermore, a randomization in the order in which experimental runs are done is used to reduce bias by balancing the effect of uncontrolled variables that have not been accounted for in the experimental design. It is concluded that the feed rate has the most influence on the cutting forces and roughness parameters. Moreover, the fibers orientation also has a significant effect on the outputs, and the cutting speed has less effect but it remains significant.

Citation

Mohamed SLAMANI , , (2022), Effect of milling parameters on the surface quality of a flax fiber-reinforced polymer composite, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING, Vol:0, Issue:, pages:1-8, SAGE PUBLICATIONS LTD

This work focuses on the study of the drilling performance of bio composites reinforced with date palm fibers (CDPF). It is a new fiber that is characterized in terms of piercing behavior for the first time. The experimental study was carried out with three types of drills, with a diameter of 10 mm and feed and spindle speeds of the order of (40, 80 and 200 mm/min) and (560, 1120 and 2240 rpm), respectively. The drilling performance was assessed in terms of delamination and surface quality, such as circularity and cylindricity of the drilled holes. Using the CMM machine, the value of the delamination factor was determined using Image J software. The results showed that the value of the latter increased with the increase in feed rate and decreased with the increase in spindle speed. The delamination factor has maximum and minimum values of approximately 1.98 and 1.01 respectively. For the first time, RSM and ANOVA were used to assess the influence and interaction of input parameters (cutting conditions) on the output parameters (delamination factor Fd) during drilling of CDPF. The results obtained help manufacturers, to choose the most appropriate machining conditions to achieve better machinability for other newly developed NFRCs in the aeronautical and defense industry where the substitution of the synthetic fibers by the natural fibers becomes inevitable for economic reasons.

Citation

SALAH Amroune , Mohamed SLAMANI , Riyadh Benyettou, , (2022), Assessment of induced delamination drilling of natural fiber reinforced composites: a statistical analysis, Journal of Materials Research and Technology, Vol:21, Issue:, pages:131-152, Elsevier

Surface roughness plays an important role in the performance of finished components. Hemispherical milling is usually used to achieve high surface quality, especially in components with complex geometries. However, the surface quality produced is strongly affected by the milling strategy chosen. Different milling strategies can be applied depending on the cutting conditions chosen for hemispherical milling. This paper investigates the effect of the milling direction on the surface roughness of a nickel-based superalloy. A single sweep finish milling parameter is tested using a hemispherical carbide tool. This milling operation was applied to a cylindrical surface segment of a support for horizontal positioning of a gas turbine blade in two distinct directions. A longitudinal direction parallel to the axis of rotation of the cylinder is first tested followed by a test in the transverse direction which covering the entire perimeter of the cylinder. In order to carry out a sufficient number of experiments to draw meaningful conclusions, a certain number of cutting parameters are tested including the extra thickness, the axial and radial pitch of the cut, the feed rate and tool diameters. The two milling strategies are considered and a mathematical model of the surface roughness is established and experimentally validated. Results show that milling along the longitudinal direction provides better roughness values compared to the transverse direction.

Citation

Mohamed SLAMANI , ,(2022), Effect of the machining strategy on the surface roughness in hemispherical milling of nickel-based superalloys (IN 718),1st International Conference on Innovative Academic Studies,Konya/Turkey

Machining fixtures are used to securely place and maintain parts in the appropriate position and support them during machining, while ensuring that the parts produced remain compliant and interchangeable. For machining fixtures intended for complex shaped parts, the optimization of positioning supports and clamping elements is the first design step that must be completed. This ensures correct holding and positioning and reduces geometric errors of the workpiece during the machining process. This paper addresses an industrial problem, related to the design and manufacture of a machining fixture for turbine blades. The purpose of this paper is to present, an optimization approach based on a genetic algorithm (GA) to select the optimal positions of the locating supports. The Plückerian coordinates concept was used to build the objective function. The determinant of the information matrix (objective function), is used as a criteria for optimizing the positioning of the machining fixtures locator. Parts with different shapes have been considered to evaluate the proposed methodology. First, cubic and cylindrical parts which are considered as classic regular shapes are chosen to test the tendency of the proposed algorithm to converge to an acceptable solution. After confirming the efficiency of the proposed algorithm, the approach was then used to optimize the fixture layout for a turbine blade. Results show that the proposed approach is a useful technique for the research and industrial communities in providing them indispensable and automated tools for the rapid development of fixture layouts.

Citation

Mohamed SLAMANI , ,(2022), Locator Placement Optimization during Machining Turbine Blades Using Genetic Algorithm,3rd International Conference on Applied Engineering and Natural Sciences,Konya, Turkey

Hole making in composite materials is one of the most expensive and time-consuming processes in the industry. The quality of holes produced is a critical criterion in all machining methods, whether traditional or modern. Drill geometry and cutting parameters directly affect holes quality. This quality can be characterized based on a few criteria, including delamination factor, ovality, surface roughness, damaged surface layer, fiber breakage, burr formation, and cracking. However, damage due to delamination is a big concern when drilling composite laminates. The purpose of this paper is therefore to investigate delamination during drilling of Alfa fiber (Stipa tenacissima) reinforced laminated composites using a factorial experimental design. A total of 20 tests were carried out covering a spindle speed varying from 500 to 2500 rpm and a feed from 10 to 40 mm/min under dry conditions and using a high speed steel (H.S.S.) drill. Based on the tests carried out, the defects created during drilling are analyzed. First, a defect location analysis is performed followed by fine-tuned microscopic observation to identify the different types of defects. It is well known that hole quality issues during drilling composite materials is usually related to the exit side of the hole, however, results of this research show that hole entry defects are also of a concern. This study is a contribution to a better understanding of the quality of drilled holes in composite structures reinforced with Alfa fibers, which should lead to improved quality and production costs.

Citation

Mohamed SLAMANI , ,(2022), Assessment of the Hole Quality During Drilling Alfa Fiber (Stipa tenacissima) Reinforced Composites,3rd International Conference on Applied Engineering and Natural Sciences,Konya, Turkey

Due to their economical, technical and environmental advantages natural fibers composites are expected to replace synthetic and hazardous materials in many industrial applications. Understanding the mechanical properties of natural fibers is therefore very important to determine the optimal intended uses of this material. Furthermore, tensile strength is one of the most important characteristic that determines the quality of composite. This paper focuses on the development of a new eco-friendly composite material based on polyester resin reinforced with long Alfa (Stipa tenacissima L) fibers. The effect of alkali treatments on the tensile properties of Alfa fibers is also investigated in this paper. The fibers have subjected to alkaline treatment with 5% NaOH concentration. All treatments were carried out under mild conditions without heating for 24 h. Results show that the alkali treatment enhances the tensile strength and Young's modulus significantly with an increase of around 60% compared to raw fibers. Furthermore, the strength-elongation curves of treated and untreated specimens have the same appearance. The results of this work suggest that local Alfa fibers are comparable to other natural fibers used as reinforcements in polymer matrix composites.

Citation

Mohamed SLAMANI , ,(2022), EFFECT OF ALKALI TREATMENT ON THE TENSILE PROPERTIES OF ALFA FIBERS (STIPA TENACISSIMA L) REINFORCED POLYMER COMPOSITES,1st International Conference on Innovative Academic Studies,Konya/Turkey

Recently, high performance machining has attracted significant attention from both academia and industry. Machine tool is the key factor to achieve the required quality for high performance machining. One of the main performance criteria for a machine tool is its ability to manufacture dimensionally and geometrically accurate parts. The machine tool is generally affected by various sources of errors that affect its performance and reliability throughout its life cycle. In this context, evaluating the performance of machine tools is important to achieve high precision. The purpose of this paper is to present a technique for assessing and comparing the performance of three different machines tools using two measurement systems. Specific tests methods are used in this work to measure the intra-axes errors of each prismatic axis of the three tested machines. Each machine tool has been measured in a similar area of its working envelope. It is found that the tested machines behave differently, in terms of accuracy, repeatability and backlash errors. On the other hand, although the six intra-axis errors of an axis of a CNC machine tool are defined individually in the literature and in standards, and are usually modeled separately in the literature, it was discovered in this work the presence of a strong correlation between the linear positioning error and the angular error. This finding was confirmed for the three tested machines. The method proposed in this work for performance verification can also be used for solving the machine tool selection problem for high performance machining.

Citation

Mohamed SLAMANI , ,(2022), A Comparative Evaluation of the Performance of Three CNC Machine Tools,3rd International Conference on Applied Engineering and Natural Sciences,Konya, Turkey

In design and manufacturing, tolerancing of parts plays a crucial role due to the incapability of manufacturing process to produce parts with exact sizes and shapes. Furthermore, designing and manufacturing complex shaped parts require optimum tolerance allocation for each part for proper assembly that meets function, cost and quality requirements. Three-dimensional (3D) tolerance analysis methods are important tools for increasingly stringent and complex requirements. The purpose of this paper is to propose a three dimensional (3D) tolerance analysis method for tolerance representation and propagation for mechanical assemblies based on the Jacobian-torsor model. The Jacobian matrix is used for tolerance propagation while the small displacement torsor (SDT) model is used for tolerance representation. The small displacement torsor concept is used as a mathematical tool for analyzing and representing the tolerance information and the geometrical deviations in six degrees of freedom, three translational vectors and three rotational vectors. The method is first applied on an assembly containing two parts, one inserted into the other. The results show that the Jacobian-torsor model is easy to use and allows a great precision over a tolerance zone. The proposed approach presents a useful technique for enhancing the accuracy and reliability of tolerance analysis models for complex shaped parts.

Citation

Mohamed SLAMANI , ,(2022), Tolerance Analysis Using the Small Displacement Torsor Concept,3rd International Conference on Applied Engineering and Natural Sciences,Konya, Turkey

This work focuses on studying the drilling performance of bio-composites with a palm fiber reinforcement fraction of 40 wt%. The drilling was carried out under dry cutting conditions at three spindle speeds of 500,1100 and 2200rpm and three feed rates of 40, 80, and 120 mm/rev using three 10 mm diameter drills: T1: HSS-TITAN, T2: HSS-CARBIDE, and T3: HSS-SUPER. The drilling performance was evaluated in terms of the circularity and cylindricity of holes that were determined using a CMM device applying the technique of contact scanning. The results showed that the effect of feed rate was greater than spindle speed. It is found that an increase in the feed rate value results in a degradation of circularity and cylindricity: For holes drilled under the following cutting conditions (N=500rpm, ƒ=40mm/rev, and T=T1). The circularity and cylindrical values was 0.0301 and 0.0475 respectively. On the other hand these values rise to 0.0740 and 0.1717, respectively, when drilling under cutting conditions (N = 500 rpm, ƒ = 120 mm/rev and T = T1). It was observed that holes drilled using coated tools (T1 and T2) produced fewer errors than the uncoated tool (T3). The circularity and cylindricity have minimum and maximum values of approximately 0.0180, 0.0852 for circularity, and 0.0475, 0.554 for cylindricity.

Citation

Riyadh benyettou , SALAH Amroune , Mohamed SLAMANI , Hocine Heraiz, khalissa.saada@univ-msila.dz, ,(2022), Analysis of the effect of cutting conditions for circularity and cylindricity errors for drilling bio composites,2nd International Conference on Engineering and Applied Natural Sciences on 15-18 October in 2022 at Konya/Turkey,Turkey

This work presents a study of the determination of the temperature at the interface in the dry friction of the low alloy steel pin against a medium-hard carbon steel disk. The parameters: Normal load applied, sliding speed, hardness of the material and coefficient of friction resulting during the tribological tests carried out play a very important role on the thermal effects of the opposing surfaces. The Archard model was used to determine the temperature at the tribological couple interface, using the parameters mentioned above.

Citation

Abdelmalek ELHADI , Hocine MAKRI , Mohamed SLAMANI , ,(2022), Evaluation of Temperature at the Interface of Pairs of Steels in Dry Sliding as a function of Hardness,1st International Conference on Scientific and Academic Research,Turkey

In the manufacturing industry, there are several types of parts of complex shapes owning various functions. The turbine blades (buckets and vanes) are one of the most important components in gas turbines. However, these blades have complex shapes and irregular surface curvature which make them difficult to machine. Production of such kind of parts is so complicated and requires a high control of machining process, advanced CNC programming, innovative tools, and special fixtures allowing to maintain exactly and rigidly in a unique position of the part during machining. In order to enhance productivity and reduce operation time, thereby increasing parts quality, the machining fixture has to fulfill several requirements such as allowing a correct location with security and repeatability of the workpiece as well as maintaining conformity and interchangeability of the machined parts. This paper addresses the challenge of machining complex geometry parts by development and realization of a dedicated machining fixture (MF) for holding a mobile blade of a gas turbine. The first novelty of this work is in the application of the Plückerian coordinates method for choosing the locator’s placement of complex-shaped parts. The choice of the locator’s placement during the design process of the fixture is performed based on the maximization of the determinant and minimization of the condition number of the locator matrix (information matrix). The second novelty is in the optimization approach used. The last novelty is in the developed and fabricated machining fixture. The performance of the developed fixture in terms of localization repeatability is evaluated based on the small displacement torsor (SDT) concept. Results show the validity of the developed fixture.

Citation

Mohamed SLAMANI , Jean-François Chatelain, , (2021), Development and validation of a machining fixture for complex-shaped components based on Plückerian matrix approach and SDT concept, The International Journal of Advanced Manufacturing Technology, Vol:114, Issue:, pages:1697–1716, Springer

This paper attempts to highlight some of the most common problems facing the machining of flax fiber composite. The essential aspects of modeling surface roughness of flax-fiber composite are also covered in this work. The most appropriate model for predicting surface roughness is then selected. The trimming experiments were conducted based on the Split-Split Plot randomized complete block design, varying the cutting velocity, feed, cutting tool geometry and fiber orientation as cutting parameters against surface roughness and delamination as responses. Accordingly, two cutting tools were tested and the most suitable tool was selected. Results show that the two-flute uncoated carbide end mill tool with cutting profiles of 70° (tool # 2) provides more accurate and repeatable results than the two-flute polycrystalline Diamond end mill (tool # 1). Results also show that the B-spline model provides more accurate estimates of the surface roughness than the two other proposed models.

Citation

Mohamed SLAMANI , , (2021), Statistical analysis of surface roughness during high speed edge trimming of flax-fiber composite based on the Split-Split plot randomized complete block design, Measurement, Vol:184, Issue:, pages:109921, Elsevier

Replacing glass fiber reinforced composites is the current challenge for flax fiber reinforced composites to reduce cost and weight of structural components. However, the quality of the machined flax fibers must be comparable to that of glass fiber. Machining a composite material means before every other consideration cutting the fibers of this material and therefore entails a risk of damage in the vicinity of the machined zone. The aim of this paper is therefore to compare experimentally the machining quality of the flax fiber reinforced polymers composite (FFRP) with that of the glass fiber reinforced polymers composite (GFRP) based on the Split-Split Plot randomized complete block design. Thus, two cutting tools were tested and the most suitable tool for each material was selected. Based on the experimental results, it was observed that the type of the cutting tool has a significant effect on the delamination behavior. Furthermore, results show that flax fiber composites can be easily machined, hence no tool wear was observed. Results also show that a two-flute uncoated carbide end mill tool is more suitable for trimming flax fiber composite while a two-flute polycrystalline Diamond end mill (PCD) tool is better suited for trimming GFRP. The lowest delamination (uncut fiber) was observed at 0º and 45º ply orientation for both materials.

Citation

Mohamed SLAMANI , , (2021), Edge trimming of flax fibers and glass fibers reinforced polymers composite – An experimental comparative evaluation, International Journal of Material Forming, Vol:14, Issue:, pages:1497–1510, Springer

Skin panels are one of the most important components constituting the aircraft structures such as wing and fuselage sections. These thin-walled components were produced from 2024-T3 aluminum alloys and many pockets were usually created in these panels by chemical milling process for weight reduction purpose. However, this process is time consuming due to its slow metal removal rate, its health hazard and its severe significant environmental impact. End-milling could provide an excellent base for creating the panel pockets and maintain the required precision. Nevertheless, maintaining a comparable quality between the two processes is quite challenging due to the dynamic nature of the cutting process and the heat generating during machining. Furthermore, an overheating in the cutting zone generally induces structural variations of the material texture, involving residual stresses and reduces stiffness which leads to damages in the machined panels. In this paper, the effect of cutting conditions on heat generation was investigated experimentally based on Taguchi and full factorial design techniques. A quantitative and qualitative statistical analysis is used to identify relationships among heat generation and process parameters, heat generation and cutting region and finally, heat generation and machining operation. The results showed that the proposed approach can successfully detects the significance or non-significance of the temperature variation between different cutting zones and machining operations.

Citation

Mohamed SLAMANI , , (2021), Statistical analysis and modeling of temperature distribution during various milling operations of thin walled aircraft parts, Physica A: Statistical Mechanics and its Applications, Vol:570, Issue:, pages:125842, Elsevier

Although CFRP materials are gaining popularity, their processing is still poorly understood. Accurate and repeatable models related to the cutting mechanism of CFRPs remains challenging. This work represents an investigation into the use of parametric models as an alternative approximation technique for modeling cutting force and surface roughness during high speed edge trimming of CFRP. Three predictive models were described and compared, some of which have been rarely used in this application. The three developed models were evaluated in terms of their accuracy and efficiency using new set of data (external data) and four evaluation indices. Result shows that Bezier models outperform regression models and can be used as alternative for modeling and prediction of machining responses. Although kriging model predict the internal data accurately, it breaks down when using external data. The new selected model can help the manufacturing industries for monitoring the cutting process of CFRPs.

Citation

Mohamed SLAMANI , Jean-François Chatelain, , (2020), Kriging versus Bezier and regression methods for modeling and prediction of cutting force and surface roughness during high speed edge trimming of Carbon fiber reinforced polymers, Measurement, Vol:152, Issue:, pages:107370, Elsevier

In this paper, an experimental approach has been developed and implemented to assess the capability of a heavyduty six-axis robot to machine CFRP parts. A simple technique based on fast Fourier transformation (FFT) analysis is devised and applied to identify the relevant sources of errors during high speed robotic trimming. A strategy based on statistical tests was investigated to quantify and predict the relative contribution of the cutting parameters and machining strategy on the cutting force components, path deviation and heat dissipation during machining. Machining quality was quantified in terms of surface damage, delamination and workpiece form errors. Statistical analysis of the experimental results reveals a strong dependence between parts accuracy, cutting direction, and robot position. An experimental model was developed to represent and predict the cutting force and the path deviation during machining. An excellent error prediction capability was observed. Results show also that the temperature in the cutting zone increased with the increase in feed rate. It was found that at high feed rate and high cutting velocity, delamination and workpiece form errors were the most sources of error affecting the accuracy of the machined parts. Results show also that the surface quality was significantly affected by the presence of many empties grooves due to fibers pull out.

Citation

Mohamed SLAMANI , Jean-François Chatelain, , (2019), Assessment of the suitability of industrial robots for the machining of carbon-fiber reinforced polymers (CFRPs), Journal of Manufacturing Processes, Vol:37, Issue:, pages:177–195, Elsevier

C V D d i a m o n d - c o a t e d c a r b i d e t o o l s c o u l d p r o v i d e a n e c o n o m i c al alternative for trimming CFRPs components compared to their PCD tools counterpart. Nevertheless, there are still some technical issues to understand related to wear resistance and surface quality. In this work, a CVD tool with six straight flutes was used to investigate the relationship between surface roughness, surface damage, tool wear, cutting force and cutting parameters during the high speed trimming of CFRPs. Statistical techniques for identifying and selecting the best cutting conditions for CVD tool are developed. In terms of tool wear, results show that the best operational condition to minimize the tool wear is achieved at lower feed rates and higher cutting speeds. Experimental results show also that a 0° ply orientation represents the worst case and produces the maximum tool wear. Furthermore, a strong correlation between the feed force and the tool wear was observed. It was found that the surface roughness decreases as a reciprocal function of cutting length. This decrease was due to the matrix burning/sticking and the thermal damage related to the low thermal conductivity of CFRP. In such situation, Ra becomes inappropriate indicator for roughness evaluation. On the other hand, it wasn’t seen any type of delamination or fiber pull-out on the trimmed surface of all coupons for the three tool life tests. Accordingly, delamination can be avoided using high fixture rigidity, high quality of CFRP laminates, a suitable cutting tool and stable operational conditions.

Citation

Mohamed SLAMANI , Jean-François Chatelain, Hossein Hamedanianpour, , (2019), Influence of machining parameters on surface quality during high speed edge trimming of carbon fiber reinforced polymers, International Journal of Material Forming, Vol:12, Issue:, pages:331–353, Springer