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Gilles Robert - One of the best experts on this subject based on the ideXlab platform.

  • in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
    Composites Part B-engineering, 2014
    Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles Robert
    Abstract:

    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.

  • in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
    Composites Part B-engineering, 2014
    Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles Robert
    Abstract:

    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.

  • in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
    Composites Part B-engineering, 2014
    Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles Robert
    Abstract:

    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.

  • in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
    Composites Part B-engineering, 2014
    Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles Robert
    Abstract:

    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.

Li Longbiao - One of the best experts on this subject based on the ideXlab platform.

  • modeling thermomechanical fatigue hysteresis loops of long fiber reinforced ceramic Matrix composites under out of phase cyclic loading condition
    International Journal of Fatigue, 2017
    Co-Authors: Li Longbiao
    Abstract:

    Abstract In this paper, the thermomechanical fatigue hysteresis loops of long-fiber-reinforced ceramic-Matrix composites (CMCs) subjected to out-of-phase (OP) cyclic loading have been investigated using the micromechanical approach. The fiber/Matrix interface shear Stress is determined as a function of the testing temperature and material properties, which affects the Matrix multicracking and fiber/Matrix interface debonding and sliding upon unloading and reloading. The relationships between the cyclic temperature and Stress level, Matrix multicracking, interface debonding and sliding, and the shape, location and the area of the thermomechanical fatigue hysteresis loops have been established. The effects of the fiber volume fraction, fatigue peak Stress, Matrix cracking space, fiber/Matrix interface debonded energy and cyclic temperature range on the thermomechanical fatigue hysteresis loops subjected to out-of-phase cyclic loading have been analyzed. The differences of the thermomechanical fatigue hysteresis loops, interface debonding and sliding between the out-of-phase (OP) and in-phase (IP) thermomechanical cyclic loading have been analyzed. The thermomechanical fatigue hysteresis loops of cross-ply SiC/MAS composite under out-of-phase tension-tension cyclic loading have been predicted.

Fodil Meraghni - One of the best experts on this subject based on the ideXlab platform.

  • in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
    Composites Part B-engineering, 2014
    Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles Robert
    Abstract:

    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.

  • in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
    Composites Part B-engineering, 2014
    Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles Robert
    Abstract:

    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.

Nicolas Despringre - One of the best experts on this subject based on the ideXlab platform.

  • in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
    Composites Part B-engineering, 2014
    Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles Robert
    Abstract:

    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.

  • in situ damage mechanisms investigation of pa66 gf30 composite effect of relative humidity
    Composites Part B-engineering, 2014
    Co-Authors: Muhamad Fatikul Arif, Fodil Meraghni, Yves Chemisky, Nicolas Despringre, Gilles Robert
    Abstract:

    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.