Impact response of thick composite plates under uniaxial tensile preloading

摘要

This work focuses on the impact response of composite plates 5 mm thick subjected to uniaxial tension preload. Laminated carbon/epoxy with quasi-isotropic stacking sequence ([0/45/90/ - 45](2))(S) samples were used. Doehlert-type design of experiments was proposed to investigate the influence of both preload and impact energy on impact composite responses. Deformation, varying from 300 to 3000 micro-strain, was imposed thanks to a preload device designed for this purpose. Impacts were generated using a home made drop tower. Imposed impact energy was varying from 30 to 214J. Post-impact damage was characterized by both non-destructive (ultrasound) and destructive (deply) techniqtres. Influence of the preloading on delamination areas (total and projected) was quantified and found sensitive to the preloading. (C) 2014 Elsevier Ltd. All rights reserved.