纤维/金属网增强层板低速冲击损伤机理和演化

本文首先通过落锤低速冲击实验测试了纯玻璃纤维增强环氧树脂复合材料和304不锈钢丝网(SSWM)/玻璃纤维混杂复合材料的力学性能，探究了SSWM嵌入数量对混杂复合材料抗冲击性能的影响．随后采用Abaqus有限元软件建立了混杂复合材料的低速冲击模型，分别采用三维Hashin失效准则和Jason-Cook破坏准则模拟了纤维/基体和SSWM的损伤；建立了基于表面接触的内聚力模型来模拟界面分层；编写了VUMAT用户子程序定义混杂复合材料层合板的渐进失效过程．结果表明：相较于纯玻璃纤维增强环氧树脂层合板，SSWM/玻璃纤维混杂增强环氧树脂层合板的抗冲击性能更优，其中铺层形式为铺层III的混杂复合材料抗冲击性能最佳．通过对比发现有限元仿真结果与实验结果吻合良好，表明建立的模型适用于SSWM/玻璃纤维混杂增强环氧树脂复合材料低速冲击损伤的评估．通过分析仿真结果发现混杂复合材料的低速冲击损伤主要是冲击区域的纤维断裂、基体破坏和层间分层；SSWM通过吸收和传递冲击能量从而提升了混杂复合材料的抗冲击性能．

Damage Mechanism and Evolution of Fiber/Metal Wire Reinforced Plastic Laminate Under Low-Velocity Impact

In this paper, the mechanical properties of pure glass fiber reinforced epoxy resin composites and Stainless Steel Wire Mesh (SSWM)/glass fiber hybrid composites were investigated through drop weight low-speed impact tests, and the influence of the number of SSWM embeddings on the impact resistance of hybrid composites was explored. Then the finite element software Abaqus was used to establish the low-velocity impact model of hybrid composites, and three-dimensional Hashin failure criterion and Jason-Cook failure criterion were used to simulate the damage of fiber/matrix and SSWM, respectively. The cohesive force behavior based on surface contact was established to simulate the interface stratification. The user subroutine of VUMAT was written to define the progressive failure process of hybrid composite laminates. The results show that compared with the pure glass fiber reinforced epoxy resin laminates, SSWM/ glass fiber reinforced epoxy resin hybrid laminates have better impact resistance, and Ply III hybrid composite has the best impact resistance. By comparison, it is found that the finite element simulation results are in good agreement with the experimental results, indicating that the established model is suitable for the low-velocity impact damage assessment of SSWM/ glass fiber reinforced epoxy resin hybrid composites. The simulation results show that the low-velocity impact damage of hybrid composites is mainly represented as fiber fracture, matrix failure and interlayer delamination in the impact area. SSWM improves the impact resistance of hybrid composites by absorbing and transferring the impact energy.