Delamination Resistance of Laminates with Various Stacking Sequences against Low Velocity Impacts

摘要

Effects of low-velocity-low-energy impacts on interlaminar damage extent in Glass/Epoxy laminate panels of [0°/90°]_(10), [0°_(10)/90°_(10)], [0°_5/90°_5]_2, [0°_5/-45°_5/90°_5/+45°_5] layups were experimentally investigated. The tests were carried out at room temperature with the help of INSTRON CEAST9350 impact system. The initial impact energy was 18J, impactor mass equaled 4kg and the corresponding contact speed was 3 m/s. During the impacts panels were simply supported with a circular steel rings of inner diameters d=80mm. It was found that the amounts of dissipated energy substantially varied depending on the reinforcement sequence and that the lowest amount of energy was dissipated by the laminate panel of [0°/90°]_(10) reinforcement stacking sequence while the highest one by the panel of [0°_(10)/90°_(10)] reinforcement stacking sequence. Such results suggested that clustering reinforcement layers of the same reinforcement orientation produced negative effects with the regard to the resistance of laminates against impact induced damage.