GFRP MECHANICAL BEHAVIOUR INDUCED BY A MESOSCOPIC SHAPING DEFECT
Résumé
The aim of this study is to evaluate the effect of the "buckles" mesoscopic defects on the composites mechanical properties. For this purpose, an analysis was made on the kinematics involved during the appearance of these defects on complex shapes. Then, a device and a protocol were developed in order to realize calibrated specimens. "Buckles" defects have been generated on glass plane weave fabric layers taking care to reproduce the amplitudes observed on a complex preforms. Composites plates with seven stacked layers were then injected and specimens were cut in different areas before mechanically testing them under static and fatigue tensile tests. The results showed that the "buckles" defects have an effect on the s static and fatigue behavior of the specimens with defects. The measured strain using DIC method showed the presence of damage in the specimen's areas with defects, which induced a loss of rigidity and a decrease of the ultimate stress. The specimen with transverse defects showed a more significant loss of mechanical performances.
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