The Experts below are selected from a list of 2295 Experts worldwide ranked by ideXlab platform
Gilles Robert - One of the best experts on this subject based on the ideXlab platform.
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in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
Composites Part B-engineering, 2014Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles RobertAbstract:Damage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (mu CT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-Matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-Matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, Matrix Microcracks appear and grow regardless the RH contents. For RH = 100%, these Microcracks are also accompanied by many Matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.
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in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
Composites Part B-engineering, 2014Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles RobertAbstract:Damage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (mu CT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-Matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-Matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, Matrix Microcracks appear and grow regardless the RH contents. For RH = 100%, these Microcracks are also accompanied by many Matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.
Muhamad Fatikul Arif - One of the best experts on this subject based on the ideXlab platform.
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in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
Composites Part B-engineering, 2014Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles RobertAbstract:Damage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (mu CT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-Matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-Matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, Matrix Microcracks appear and grow regardless the RH contents. For RH = 100%, these Microcracks are also accompanied by many Matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.
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in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
Composites Part B-engineering, 2014Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles RobertAbstract:Damage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (mu CT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-Matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-Matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, Matrix Microcracks appear and grow regardless the RH contents. For RH = 100%, these Microcracks are also accompanied by many Matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.
Gerald Camus - One of the best experts on this subject based on the ideXlab platform.
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monitoring damage evolution of sicf sibc m composites using electrical resistivity crack density based electromechanical modeling
Acta Materialia, 2017Co-Authors: Coraline Simon, Francis Rebillat, V Herb, Gerald CamusAbstract:Abstract The introduction of Ceramic Matrix Composites parts in civil aeronautical engines requires a thorough understanding of their mechanical behavior. In this respect, a SiCf/PyC/[Si B C]m composite was submitted to room temperature tensile tests with electrical resistance monitoring and acoustic emission recording. The evolution of the electrical resistance as a function of strains was modeled using a network of resistances in series and parallel, with the introduction of locally higher resistances representing potential discontinuities in the material due to Matrix Microcracks. The evolution of the effective Matrix crack density was deduced from the interposed unloading-reloading cycles. A high-quality correlation was found between the measured and predicted evolution of (i) the electrical resistance as a function of strains and (ii) their residual behavior observed upon unloading. A relationship is therefore established between the electrical resistance of the sample and the density of Matrix cracks leading to a hindering of mechanical properties.
Fodil Meraghni - One of the best experts on this subject based on the ideXlab platform.
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in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
Composites Part B-engineering, 2014Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles RobertAbstract:Damage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (mu CT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-Matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-Matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, Matrix Microcracks appear and grow regardless the RH contents. For RH = 100%, these Microcracks are also accompanied by many Matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.
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in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
Composites Part B-engineering, 2014Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles RobertAbstract:Damage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (mu CT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-Matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-Matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, Matrix Microcracks appear and grow regardless the RH contents. For RH = 100%, these Microcracks are also accompanied by many Matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.
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effect of interfacial decohesion on stiffness reduction in a random discontinuous fibre composite containing Matrix Microcracks
Composites Science and Technology, 1996Co-Authors: Fodil Meraghni, C J Blakeman, M L BenzeggaghAbstract:Abstract This work focuses on the modelling of interfacial debonding effects on the overall behaviour of randomly oriented discontinuous-fibre composites containing Matrix Microcracks. A micromechanical analysis based on Eshelby inclusion theory and the Mori-Tanaka method has been performed. It is intended to evaluate the interfacial stress tensor by considering the local perturbation due to the onset and the growth of Matrix Microcracks. However, as developed previously, the interfacial degradation effects are modelled by using the damage participation rate. The latter is determined on the basis of an experimental damage methodology. This methodology is based on the amplitude treatments and microscope observations, which lead to an identification and a schematic classification of damage mechanisms. The model developed is then used to predict stiffness reduction and to simulate the behaviour of a composite with degraded interfaces and containing Matrix Microcracks. The model simulations agree well with experimental results, notably for the materials referred to as 600 tex and 1200 tex. Indeed, the simultaneous integration of Matrix degradation and interfacial debonding has improved the numerical results because for these two materials the damage development is mainly governed by both failure processes as confirmed by the experimental findings.
Nicolas Despringre - One of the best experts on this subject based on the ideXlab platform.
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in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
Composites Part B-engineering, 2014Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles RobertAbstract:Damage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (mu CT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-Matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-Matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, Matrix Microcracks appear and grow regardless the RH contents. For RH = 100%, these Microcracks are also accompanied by many Matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.
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in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
Composites Part B-engineering, 2014Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles RobertAbstract:Damage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (mu CT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-Matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-Matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, Matrix Microcracks appear and grow regardless the RH contents. For RH = 100%, these Microcracks are also accompanied by many Matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.