碳纤维平纹与斜纹编织复合材料低速冲击多尺度分析与对比

Multi-scale analysis and comparison of low-speed impact of carbon fiber plain and twill woven composite materials

为了探究平纹与斜纹编织复合材料的冲击响应,构建了多尺度框架来进行二者的分析与比较。首先构造出介观下的平纹与斜纹编织结构几何模型来探究二者的力学性能,然后将平纹与斜纹编织几何模型进行局部均匀化从而转化为等效交叉层合板模型,最后把二者的等效交叉模型拓展为宏观下的低速冲击仿真模型,在6 J能量下做了冲击仿真模拟并与实验结果做了对比。仿真和实验结果显示,二者仿真下的冲击力变化趋势与实验下的冲击力变化趋势相似,说明了该多尺度框架的可行性。斜纹编织复合材料的冲击力峰值、冲击力震荡时间以及吸收能量都要高于平纹编织复合材料。

To explore the impact response of the plain and twill woven composites, a multi-scale framework was constructed to analyze and compare. First, the mesoscale representative volume element(RVE) of plain and twill woven composites were established to explore their mechanical properties, then locally homogeneous the mesoscale representative volume element(RVE) of pain and twill woven composites were transformed into equivalent cross lamination(equivalent cross-ply laminate, ECPL) model. Finally, the ECPL model of both was expanded into a macroscopic low-speed impact model, with numerical simulations at 6 J impact energy and compared with the experimental results. The results show that the impact time curves of plain and twill woven composite are similar to the experiments, verifying the effectiveness of the macroscopic model. The impact peak of twill woven composite, impact shock time and energy absorption are higher than the plain woven composite.