In a composite material reinforced by shortudrandom fibers, damage results from differentudelementary failure mechanisms such as matrixudmicro-cracking, fiber pull out, failure ofudfiber/matrix interface, failure of fibers, etc.udThese damages have a large influence on theudmacroscopic behavior of composite materials.udTo obtain a good mechanical performance of audcomposite material, it is important to optimizeudthe fiber ratio and the quality of theudfiber/matrix interface, which have a directudinfluence on the damage mentioned above. Theudmain objective of this study is to determine theudinfluence of structural parameters on theudevolution of damage for two types of polypropyleneudglass-fiber reinforced composites. Inudparallel with a classical approach of theudmechanical theory of damage, which consists inudload-unload tensile tests, the use of acousticudemission allows one to follow in real time theudcharacter and the importance of damageudmechanisms in the course of loading. Inudaddition, fractographic analysis makes itudpossible to confirm different assumptions andudconclusions from this study.
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