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The birefringent property, known also as the double-refraction phenomenon, is used in a polarisco... more The birefringent property, known also as the double-refraction phenomenon, is used in a polariscope to study a stress field developed in a three point loading beam. The model used for this analysis was made of an epoxy resin (PLM4) and a hardener (PLMH). The stress field was locked in the model by the stress freezing technique. Photoelastic fringes obtained on the analyzer of a regular polariscope were used to determine completely the stress field. A finite elements analysis was also conducted in order to determine the stress field numerically. A whole field comparison of the experimental photoelastic fringes and the simulated ones and a local analysis using the principal stresses difference showed very good agreement between the experimental solution and the numerical one.
Applications of Computer Algebra: proceedings, 2018, ISBN 9788416954872, págs. 51-54, 2018
The stresses induced by a mechanical contact imposed on a birefringent sphere have been studied e... more The stresses induced by a mechanical contact imposed on a birefringent sphere have been studied experimentally and numerically. The birefringent sphere is machined from a birefringent parallelepiped on a high speed numerically controlled machine. The residual stresses developed in the birefringent sphere have been eliminated by a heat treatment relaxation. The technique of freezing and mechanical cutting in thin slices was used. In the case of 3D photoelasticity, the frozen stress techniques, which are very much used, may introduce residual stresses in the cut up slices. Although the means to avoid the introduction of these residual stresses are well established, these techniques remain time consuming. Slices are analyzed on a polariscope using plane polarized light and circular polarized light. The photoelastic fringes are used to determine the principal directions of the stresses as well as the values of the stresses. A numerical simulation using the finite elements made it possib...
e-ISSN: 2170-127X, Experimental and numerical analysis of the fields of the frozen stresses in an... more e-ISSN: 2170-127X, Experimental and numerical analysis of the fields of the frozen stresses in an epoxy sphere using the method of freezing mechanical cutting Kamel Touahir b, , Ali Bilek , Philippe Bocher , Mustapha Beldi b L.M.S.E Laboratory, Mechanical Engineering Department, Mouloud Mammeri University Algeria, Mechanical Engineering Department, Mouloud Mammeri University, Algeria, c LOPFA, Departement of Mecanical Engineering, Ecole de technologie supérieure. 1100Rue Notre-Dame Ouest, Montreal, H3C 1K3, Canada,
The incorporation of lubricating oil at high levels in the epoxy composite materials makes it pos... more The incorporation of lubricating oil at high levels in the epoxy composite materials makes it possible to obtain materials with low friction and wear. This article evaluates the wear behaviour of an epoxy-based composite obtained by the addition of lubricating oil and activated carbon. An oil content of up to 31wt% is trapped and maintained in the matrix by the presence of activated carbon. The wear experiments are carried out on a pin-on-disk type tribometer. The tests are carried out on pins of different compositions sliding on steel discs (XC48) under dry friction conditions. The effect of various parameters such as speed and loading has been investigated. The wear surfaces are analyzed by using a scanning electron microscope to observe the different wear mechanisms. The results show that the addition of activated carbon made it possible to trap large quantities of oil in the matrix. This decreased greatly the coefficient of friction and increased the capacity of the sample to wi...
The incorporation of lubricating oil at high levels in the epoxy composite materials makes it pos... more The incorporation of lubricating oil at high levels in the epoxy composite materials makes it possible to obtain materials with low friction and wear. This article evaluates the wear behaviour of an epoxy-based composite obtained by the addition of lubricating oil and activated carbon. An oil content of up to 31wt% is trapped and maintained in the matrix by the presence of activated carbon. The wear experiments are carried out on a pin-ondisk type tribometer. The tests are carried out on pins of different compositions sliding on steel discs (XC48) under dry friction conditions. The effect of various parameters such as speed and loading has been investigated. The wear surfaces are analyzed by using a scanning electron microscope to observe the different wear mechanisms. The results show that the addition of activated carbon made it possible to trap large quantities of oil in the matrix. This decreased greatly the coefficient of friction and increased the capacity of the sample to withstand higher values of sliding velocities and pressures.
The birefringent property, known also as the double-refraction phenomenon, is used in a polarisco... more The birefringent property, known also as the double-refraction phenomenon, is used in a polariscope to study a stress field developed in a three point loading beam. The model used for this analysis was made of an epoxy resin (PLM4) and a hardener (PLMH). The stress field was locked in the model by the stress freezing technique. Photoelastic fringes obtained on the analyzer of a regular polariscope were used to determine completely the stress field. A finite elements analysis was also conducted in order to determine the stress field numerically. A whole field comparison of the experimental photoelastic fringes and the simulated ones and a local analysis using the principal stresses difference showed very good agreement between the experimental solution and the numerical one.
Applications of Computer Algebra: proceedings, 2018, ISBN 9788416954872, págs. 51-54, 2018
The stresses induced by a mechanical contact imposed on a birefringent sphere have been studied e... more The stresses induced by a mechanical contact imposed on a birefringent sphere have been studied experimentally and numerically. The birefringent sphere is machined from a birefringent parallelepiped on a high speed numerically controlled machine. The residual stresses developed in the birefringent sphere have been eliminated by a heat treatment relaxation. The technique of freezing and mechanical cutting in thin slices was used. In the case of 3D photoelasticity, the frozen stress techniques, which are very much used, may introduce residual stresses in the cut up slices. Although the means to avoid the introduction of these residual stresses are well established, these techniques remain time consuming. Slices are analyzed on a polariscope using plane polarized light and circular polarized light. The photoelastic fringes are used to determine the principal directions of the stresses as well as the values of the stresses. A numerical simulation using the finite elements made it possib...
e-ISSN: 2170-127X, Experimental and numerical analysis of the fields of the frozen stresses in an... more e-ISSN: 2170-127X, Experimental and numerical analysis of the fields of the frozen stresses in an epoxy sphere using the method of freezing mechanical cutting Kamel Touahir b, , Ali Bilek , Philippe Bocher , Mustapha Beldi b L.M.S.E Laboratory, Mechanical Engineering Department, Mouloud Mammeri University Algeria, Mechanical Engineering Department, Mouloud Mammeri University, Algeria, c LOPFA, Departement of Mecanical Engineering, Ecole de technologie supérieure. 1100Rue Notre-Dame Ouest, Montreal, H3C 1K3, Canada,
The incorporation of lubricating oil at high levels in the epoxy composite materials makes it pos... more The incorporation of lubricating oil at high levels in the epoxy composite materials makes it possible to obtain materials with low friction and wear. This article evaluates the wear behaviour of an epoxy-based composite obtained by the addition of lubricating oil and activated carbon. An oil content of up to 31wt% is trapped and maintained in the matrix by the presence of activated carbon. The wear experiments are carried out on a pin-on-disk type tribometer. The tests are carried out on pins of different compositions sliding on steel discs (XC48) under dry friction conditions. The effect of various parameters such as speed and loading has been investigated. The wear surfaces are analyzed by using a scanning electron microscope to observe the different wear mechanisms. The results show that the addition of activated carbon made it possible to trap large quantities of oil in the matrix. This decreased greatly the coefficient of friction and increased the capacity of the sample to wi...
The incorporation of lubricating oil at high levels in the epoxy composite materials makes it pos... more The incorporation of lubricating oil at high levels in the epoxy composite materials makes it possible to obtain materials with low friction and wear. This article evaluates the wear behaviour of an epoxy-based composite obtained by the addition of lubricating oil and activated carbon. An oil content of up to 31wt% is trapped and maintained in the matrix by the presence of activated carbon. The wear experiments are carried out on a pin-ondisk type tribometer. The tests are carried out on pins of different compositions sliding on steel discs (XC48) under dry friction conditions. The effect of various parameters such as speed and loading has been investigated. The wear surfaces are analyzed by using a scanning electron microscope to observe the different wear mechanisms. The results show that the addition of activated carbon made it possible to trap large quantities of oil in the matrix. This decreased greatly the coefficient of friction and increased the capacity of the sample to withstand higher values of sliding velocities and pressures.