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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
Author
ROLLAND, Héloise
ccSAINTIER, Nicolas
RAPHAEL, Ilan
302928 Solvay (France)
LENOIR, Nicolas
204904 Laboratoire Navier [navier umr 8205]
KING, Andrew
1744 Synchrotron SOLEIL [SSOLEIL]
ROBERT, Gilles
471759 Solvay Engineering Plastics

URI
http://hdl.handle.net/10985/16475
DOI
10.1016/j.compositesb.2017.12.051
Date
2018
Journal
Composites Part B: Engineering

Abstract

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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