复合材料层板冲击损伤响应的能量和接触力研究

摘 要：本文以复合材料层压板标准冲击试样，用落锤试验、冲击后压缩试验的手段研究了三种不同铺层的低速冲击特性。分析了冲击响应接触力、能量的基本特性和变化规律，发现冲击能量相对于板阻抗水平的不同会导致接触力-时间曲线形状的差异。从冲击总能量、吸收能量和损伤耗散能量的角度阐释了能量和接触力与层压板损伤、变形、压缩剩余强度的关系，损伤直接取决于吸收能量，与冲击总能量有较好的正相关关系，但与接触力无明显联系。最大接触力是仅取决于板损伤阻抗性能的一个门槛值。同时，进行了冲击过程动态有限元模拟，得到了冲击响应参数曲线和损伤结果，与试验结果有较好的对应关系。

ENERGY AND CONTACT FORCE STUDY OF COMPOSITE LAMINATE IMPACT DAMAGE RESPONSE

Abstract： Three layups of Composite laminate are tested about dropping weight and CAI. The impact response is recorded, and parameters like contact force and energy are analyzed on their characteristics and diversity. It is discovered that the shape of contact force versus time curve apparently changes while the energy level increases, relative to the laminate’s damage resistant ability. Impact energy, absorbed energy and damage dissipated energy are obtained and their relationships with dent, delamination and CAI strength are analyzed and discussed. Results show that damage is more linearly relevant to impact energy than absorbed energy, although the latter seems to be more account theoretically. Maximum contact force is no way to characterize damage, for the test data tell that it is only a threshold due to the laminate’s resistant ability. Additionally, the impact is simulated via ABAQUS. Response curves are obtained and damage is predicted, both of which fit the testing results.