渐近均匀化理论预报缝纫复合材料弹性性能  

Asymptotic Homogenization Theory for Predicting Effective Elastic Properties of stitched composite laminates

作　　者：谢顺利[1] 张俊乾[1] 

机构地区：[1]上海大学,上海200072

出　　处：《应用力学学报》2009年第3期473-479,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(10772105)

摘　　要：基于缝纫复合材料的结构特征,假定其具有周期性细观结构。利用渐近均匀化方法并结合摄动技术建立一系列控制方程,考虑由于缝纫扰动造成的材料的非均匀分布,由此确定缝纫复合材料的宏观等效性能。已有的试验结果相比较,本文预报结果与试验吻合较好。研究发现,缝纫造成了层合板刚度的下降,在面内方向缝纫密度越大,刚度降低越明显。缝纫产生的纤维变形区的宽度增加对刚度有利,纤维变形区的长度对拉伸刚度影响不大。并对缝纫参数对缝合板性能的影响进行了预报,为实际工程问题提供了预测材料性能的方法。asymptotic homogenization theory, effective elastic properties of stitched composite laminates with periodic stitching threads are predicted with emphasizing upon inhomogeneous distribution of material properties at ply-level caused by stitch. The model prediction coincides cvell with the experiments. The effect of stitching parameters on elastic properties of stitched composite laminates is illustrated. The results show that stitching reduces the stiffness of composite laminates, the higher the stitch density, the greater the reduction of stiffness. And the length of fiber distortion region almost has no effect on tension stiffness.

关 键 词：均匀化理论 缝纫层合板 非均匀材料 等效刚度 

分 类 号：TB330.1[一般工业技术—材料科学与工程]