胶接修复工艺的复合材料外涵机匣强度分析

航空发动机结构复材化是发动机减轻质量的主要途径。针对复合材料外涵机匣服役后的损伤特点，选用胶接修复工艺进行机匣修补。研究了不同胶接修复方法的修复效果和适用范围。基于三维渐进损伤方法，使用Abaqus软件建立了复合材料外涵机匣典型件胶接修复模型，对机匣危险区域损伤孔边和翻边处模拟了复合材料损伤的产生和演化，预测了使用填胶修复和预浸料修复的典型件模型静拉伸强度和实际机匣模型的静压缩强度。结果表明：损伤深度不超过厚度的10%时采用填胶修复以恢复气动外形，损伤深于厚度的10%至贯穿时预浸料修复能同时恢复机匣的强度和刚度。

Strength analysis of composite bypass casing of aero-engine in adhesive bonded repair

The application of composite materials is the main way to reduce aero-engine mass. Adhesive bonded repair was used to repair the damage of composite bypass casing of aero-engine, which was caused by different load cases and environmental conditions. A finite element model based on three-dimensional progressive damage method was constructed by Abaqus for the composite bypass casing of aero-engine of adhesive bonded repair, which simulated the propagation and evolution of composite material damage near holes and flanges, and predicted the static tensile and compression strength of resin-injection repair and scarf repair. Results showed that resin-injection was applied to repair the aerodynamic shape when the damage did not exceed 10% of the thickness while scarf repair was used to regain the static strength when the damage exceeded 10% of the thickness to penetration.