复合材料层合板斜接式挖补修理稳定性分析

Analysis on Buckling Behavior of Composite Laminates With Scarf Repair Joint

对复合材料层合板挖补修理模型进行了参数化的有限元计算，分析了挖补修理结构失稳栽荷与挖补角、胶层厚度以及铺层方式之间的关系，得到了最优挖补修理模型。结果表明，异种材料补片会显著提高挖补修理结构的稳定性，在一定范围内，减小胶层也会改善挖补修理结构的稳定性。当胶层厚度在0．15～0．25mm变化时，随着胶层厚度减小，挖补修理结构的稳定性增强；当铺层方式为[03／±45／±45／90]。时，挖补修理结构稳定性最强。

In this paper, a parametric finite element （FE） model has been developed to allow a broad study into the effect of various parameters on the performance of a scarf joint. The buckling load of scarf repair composite struc ture has been investigated and determined with respect to changes in scarf angle, adhesive thickness and layup se quence. Furthermore, the best scarf repair model was developed. Dissimilar material joint improves the stability of scarf repair composite structure extraordinarily. The adhesive thickness varying between 0.15 mm and 0.25 mm, reducing the adhesive thickness also improves the stability of scarf repair composite structure. The scarf repair model with [ 03/ ±45/±45/90 Is has the best stability. The results of this investigation provide further insight into the failure that devel ops in scarf repairs of composite structures under compressive load.