三维层层正交复合材料冲后压缩有限元仿真

Finite Element Simulation of Three-Dimensional Layer-to-Layer Orthogonal Composites Compression after Impact

摘要: 为了了解三维层层正交织物复合材料冲后压缩的损伤起始和发展，本文建立有限元模型并将有限元仿真结果与冲击及压缩实验结果进行对比进而验证所建立模型的有效性。通过对复合材料进行12 J能量低速冲击及冲后压缩实验获取损伤形貌与响应曲线。基于计算效率和损伤细节的考虑，本文建立了介观尺度下的有限元模型，并采用二步法分别模拟两个实验过程。模型包含两个部分：树脂基体和浸渍增强纱线。两部分选用不同的损伤准则模拟其损伤的起始和发展。最后将仿真结果得到的力–时间曲线、载荷–位移、复合材料表明损伤形貌、浸渍增强纱线断裂情况与实验结果进行对比，验证了有限元的模型的可靠性。

Abstract: In order to understand the damage initiation and development of three-dimensional layer-to-layer fabric composites after impact compression, this paper establishes a finite element model and compares the finite element simulation results with experiments to verify the effectiveness of the model. The damage morphology and response curve of the composite were obtained by 12 J energy low-speed impact and post-impact compression tests. Based on the consideration of computational efficiency and damage details, a mesoscopic finite element model is established and the two-step method is used to simulate the two experimental processes. The model consists of two parts: resin matrix and impregnated reinforced yarn. The two parts use different damage criteria to simulate the initiation and development of damage. Finally, the force-time curve, load-displacement, damage morphology of composite material, and the fracture of impregnated reinforced yarn obtained from the simulation results are compared with the experimental results, which verifies the reliability of the finite element model.