T300/QY8911层合板低速冲击试验及有限元模拟

Experiment and Finite Element Simulation in T300/QY8911 Laminate under Low Velocity Impact

对T300/QY8911复合材料层合板进行了低速冲击试验研究及数值仿真模拟。通过自由落体装置对层板进行冲击,并使用超声C扫描技术检测了层板冲击后的损伤状态,获得了不同能量下层板内部的损伤面积。建立了用于预测复合材料层合板在低速冲击作用下损伤演化的3D有限元模型,模型包含了用于模拟分层损伤的界面元和用于模拟纤维断裂、纤维挤压、基体开裂、基体挤裂等面内损伤形式的3D实体单元。该模型考虑了面内基体损伤对层间强度的影响。本文中的数值仿真结果和试验结果的对比验证了模型的合理性和有效性,文中还分析了影响低速冲击后层板内部分层面积的主要因素。

Experiment researches and numerical simulations were conducted to predict low velocity impact damage of T300/QY8911 composite laminates. Post-impact delamination areas resulting from a drop weighting testing equipment under various energy levels were obtained by a C-scan machine. A 3D finite element model was proposed to investigate the damage evolution of composite laminates under low velocity impacts. In the finite element analyses, interface element was used to model the delamination and 3D solid element was employed to simulate the fiber tensile failure, fiber compressive failure, matrix crushing, matrix cracking and etc. Furthermore, effects of in-plane matrix damages on the inter-laminar strength were also considered. illustrated by comparing the simulating results with experimental interior delamination after low velocity impacts were discussed as Reasonability and effectiveness of the model were data and the dominant factors influencing the area of well.