缝合复合材料弹性常数细观力学模型的分析比较

Comparison of Micro-Mechanical Model for Elastic Constants Analysis of Stitched Composites

对近几年来公开发表的缝合复合材料弹性常数的细观力学模型进行了分析比较。通过计算对比了铺层纤维面内弯折、正弦波状弯曲、多项式描述纤维弯曲三个典型的缝合复合材料弹性常数的细观力学分析模型。结果表明,采用面内纤维弯折假设的弹性常数分析模型对缝纫参数的改变不敏感;采用面内纤维弯曲假设的模型对缝纫参数改变敏感,不同模型得到的弹性常数随缝纫参数变化趋势几乎是相同的。但是,假设纤维在针脚附近只有部分纤维发生弯曲比假设纤维全部发生弯曲得到的结论更合理。

A comparison of micro-mechanical models for the elastic constants of stitched composites reported in recent years is carried out. Three typical micro-mechanical models for the elastic constants analysis of stitched composites are compared by calculating, wihch are in-plane fiber bend model, sine waviness model and polynomially described fiber waviness model. It is shown that the result of in-plane fiber bend model is much more sensitive for the in-plane elastic constants than the in-plane waviness model when stitch parameter changes, and different models have similar tendency. However, it is more reasonable to resume that only a part but not all of the in-plane fiber is deformed.