缝纫复合材料层合板面内弹性模量分析

基于对缝纫孔附近局部细观结构的分析，提出了一种预测缝纫复合材料层合板面内力学性能的理论模型．从分析缝孔单胞的纤维弯曲几何特征入手，最终得到单向板及层合板的弹性常数．通过有限元分析研究了缝纫参数对复合材料层合板面内等效模量的影响．研究结果表明，缝纫造成单向板及层合板面内材料性质的不均匀，随着缝纫密度和缝纫线直径的增加，层合板的等效模量逐渐降低．

ON IN-PLANE ELASTIC MODULUS OF STITCHED COMPOSITE LAMINATES

A theoretical approach is presented for analyzing the in-plane mechanical properties of the stitched composite laminates based on the microstructures of fibers near the stitch holes. The geometrical characteristics of the distorted fibers in the stitch unit cells are considered. The elastic constants and stiffness matrices of lamina and laminate are obtained finally. The effects of stitching parameters on the equivalent elastic modulus of the laminates are studied using the finite element analysis. The results show that the material properties of stitched composite laminates are inhomogeneous due to stitching, and the equivalent elastic modulus of the laminates decreases with the increase of the stitch density and thread diameter.