The main objective of this study is to predict initiation of delamination in carbon/polyphenylenesulfide (PPS) composite material during fatigue testing. In transportation engineering fields such as aeronautics or aerospace, composite materials have many applications because of their high strength/weight ratio. Thermoplastic matrix as PPS offer a number of advantages, like recycling, compared to conventional thermosetting resins such as epoxies. Because this material can exhibit a high crystallinity rate and high glass transition temperature. And so have very good thermomechanical properties. Nevertheless, before making structural parts in thermoplastics composites, an accurate and global knowledge of the mechanical behaviour is needed as well in static, in fatigue and aging effects. When during fatigue testing delamination, defined as the debonding between two adjacent layers occurs, very often that means a rapid and detrimental failure for the structure. Therefore, in order to establish a criterion able to predict delamination onset, fatigue tests at different stress levels and Arcan-Mines tests have been performed. This study presents a procedure to evaluate the interface strength of laminated composites when submitted to fatigue loadings. Finally we propose a reliable delamination initiation criterion and its validation for the considered material.
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