含任意分层缝纫正交层合板压缩屈曲分析

建立了分析含任意形状分层的缝纫增强复合材料层合板压缩屈曲问题的连续分析模型。该模型允许缝纫层合板含有一个或多个形状不同的分层。分析结果表明,缝纫针脚在分层区域的分布、缝纫密度和缝线的等效刚度系数对分层子板的压缩屈曲应变均有较大影响。 

ANALYSIS ON COMPRESSION BUCKLING OF STITCHED ORTHOTROPIC LAMINATES INCLUDING ARBITRARY DELAMINATION

A continuous model for determining the buckling strains of stitched laminates including arbitrary embedded delamination is developed. The analysis allows stitched laminates to have a multiple number of delminations of various shapes and sizes, and at any locations. The method treats the discontinuous laminates as a body without delamination but with a force system added at a number of discrete points in the delaminated region so as to make the net interfacial tractions to vanish at these points. Hence, the procedure solves problems of delaminated stitched laminates directly as a continuous system. Numerical results accounting for the effects of location of stitches in the delamination region, stitching density, and equivalent stiffness coefficient of stitching thread on buckling strains are presented.