关键词: 缝纫, 复合材料, 层合板, 弹性模量

Abstract: 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.

Key words: stitch, composite, laminates, elastic modulus