缝线粗细对复合材料面内弹性模量的损伤分析

建立了以碳纤维八枚五飞经面缎为基布,以不同粗细缝线的三维有限元模型。分别预报了缝线植入处基布全部损伤和部分损伤两种状况的弹性模量,较粗的缝线使得复合材料的拉剪弹性模量降低,较细的缝线对面内弹性模量影响较小;与未缝合相比,不同直径的缝线的模量变化在9.6%之内。此外,实验结果比有限元预报值大,但缝线粗细对复合材料面内弹性模量影响规律两者结果一致。

Damage Analysis of Elastic Modulus of Composites by Stitching Diameter

A three-dimensional finite element model with different stitching diameter was established based on carbon fabric with 8/5 warp satin weave. The elastic modulus of the composites was predicted by the total damage and partial damage. The thicker stitch thread make the tensile modulus of the composites decrease, and the thinner stitch thread had little effect on the internal elastic modulus.Compared with unstitching,modulus variation of the different diameter is within 9.6%.The elastic modulus of the composites was verified.The results show that the experimental results were larger than the finite element prediction, and the experimental result agrees with prediction.