Réponse à l'impact de plaques composites épaisses préchargées en tension uniaxiale.

Abstract

This study concerns Carbon / epoxy composite plates. Three di erent thickness were investigated ([0°=45°=90°=45°]i)S for i = 2, 3 or 4 (5, 10 and 15mm thick). An instrumented falling-weight-impact test machine was used for test in this work. Impact energies were 30 J to 214 J. Tensile preloadings were de ned according to the ultimate tensile strength of the plates (300 to 3000 micro strain). Tests were de ned using Doelhert design of experiments for which parameters were thickness, tensile preloading and impact energy and were performed on a drop tower. Impact behavior were characterized from impact force and displacement measurements. The strain state of back sheet was determined using digital correlation. Damage was characterized using non destructive control technique and deply technique.Post impact tension are carried to characterize the residual strength and to see the dammage evolution.