Fatigue damage mechanisms of short fiber reinforced PA66 as observed by in-situ synchrotron X-ray microtomography
Article dans une revue avec comité de lecture
The understanding of fatigue damage mechanisms of short fiber reinforced thermoplastics are a key issue in order to optimize material processing and propose physically based multiscale fatigue damage models. The presented work aims at a fine description of 3D damage development as observed by synchrotron X-ray microtomography. Damage processes at the micro and mesoscale are fully described in order to extract the elementary damage mechanisms, their sequence and kinetics. The effects of local fiber configuration and orientation are particularly detailed. From observations it is clearly evidenced that cavitation plays a major role in the fatigue damage process as it triggers all elementary damage mechanisms observed at the microscale. It is also shown that a characteristic length appears in the fatigue damage development. This internal length is in the order of magnitude of the spherulite size, suggesting a strong impact of the spherulite size on the fatigue damage development. Finally the effect of local fiber orientation on the micro and meso crack orientation is presented.
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Article dans une revue avec comité de lectureRAPHAEL, Ilan; SAINTIER, Nicolas; ROLLAND, Heloise; ROBERT, Gilles; LAIARINANDRASANA, Lucien (Elsevier, 2019)Multiple parameters influence the durability of reinforced thermoplastics under fatigue loading. Having models unifying as many of these parameters, while providing an accurate estimation of the fatigue lifetime, is thus ...
Damage mechanisms in short glass fibre reinforced thermoplastic during in situ microtomography tensile tests Article dans une revue avec comité de lectureROLLAND, Héloise; SAINTIER, Nicolas; ROBERT, Gilles (Elsevier, 2016)Micromechanical modelling of short fibre reinforced thermoplastics requires identification of damage mechanisms and their kinetics as a function of their microstructure. A compact tensile machine has been designed to observe ...
In situ X-ray tomography investigation on damage mechanisms in short glass fibre reinforced thermoplastics: Effects of fibre orientation and relative humidity Article dans une revue avec comité de lectureROLLAND, Héloise; SAINTIER, Nicolas; WILSON, Pablo; MERZEAU, Jonathan; ROBERT, Gilles (Elsevier, 2017)Damage mechanisms of reinforced polyamide 6,6 have been studied in 3D through in situ X-ray tomography tensile tests. 3D pictures of the microstructure have been taken during tensile tests to catch damage evolution in the ...
On the role of the spherulitic microstructure in fatigue damage of pure polymer and glass-fiber reinforced semi-crystalline polyamide 6.6 Article dans une revue avec comité de lectureRAPHAEL, Ilan; SAINTIER, Nicolas; ROBERT, Gilles; BEGA, Jéremy; LAIARINANDRASANA, Lucien (ELSEVIER, 2019)Understanding fatigue damage mechanisms in short fiber reinforced thermoplastics is a key issue in order to optimize material processing and propose physically based multiscale fatigue damage models. The present work aims ...
In situ synchrotron ultrasonic fatigue testing device for 3D characterisation of internal crack initiation and growth Article dans une revue avec comité de lectureMESSAGER, Alexandre; JUNET, Arnaud; PALIN-LUC, Thierry; BUFFIÉRE, Jean Yves; SAINTIER, Nicolas; RANC, Nicolas; EL MAY, Mohamed; GAILLARD, Yves; KING, Andrew; BONNIN, Anne; NADOT, Yves (Wiley-Blackwell, 2020)This work presents a new ultrasonic fatigue testing device for studying the initiation and propagation mechanisms of internal microstructurally short fatigue cracks using in situ synchrotron tomography. Its principle is ...