DAMAGE TOLERANCE OF GLASS MAT EPOXY LAMINATES HYBRIDIZED WITH FLEXIBLE RESIN UNDER STATIC AND IMPACT LOADING/

This study deals with the impact property and damage tolerance of matr ix hybrid composite laminates with different laminate constitution. Th e matrix hybrid composite laminates consisted of the laminae with a co nventional epoxy resin and the laminae with a flexible epoxy resin mod ified from the conventional resin to avoid the interlaminar delaminati on. The impact energy absorption ratio greatly depended on the matrix resin placed at the impact face. The energy absorption was almost cons tant if the conventional resin was placed at the impact surface layer, while it increased exponentially with the increasing fraction of the flexible resin if the flexible resin was placed at the impact face. Th e impact energy was absorbed by the damage development and propagation in the laminate with conventional resin laminae as the impacted face, while it was absorbed by both the recoverable deformation of the flex ible resin and the damage propagation in the laminate with flexible re sin laminae as the impacted face.