蜂窝夹层结构反推力装置移动外罩外壳体铺层优化设计与失效分析

Stacking Optimization and Failure Analysis of the Honeycomb Sandwich Structure Translating Sleeve Outer Skin for Thrust Reverser

为减轻大涵道比涡轮风扇发动机反推力装置的质量,对反推力装置蜂窝夹层结构移动外罩外壳体进行了铺层的优化设计和失效分析。整个研究过程分为以下3个步骤:(1)利用数值计算得到移动外罩外壳体的气动载荷;(2)利用有限元分析软件Nastran和复合材料结构分析与优化软件Hyper Sizer对数值计算得到的载荷下的反推力装置移动外罩外壳体进行铺层的优化设计,得到质量比原始方案降低35%的反推力装置移动外罩外壳体铺层优化方案;(3)基于剪切皱曲失效理论对优化后的反推力装置移动外罩外壳体进行失效分析。结果表明:质量降低35%的反推力装置移动外罩外壳体可以承受反推力装置的工作载荷,当载荷超过711.9 N/mm时,外壳体首先出现剪切皱曲失效。

In order to reducing the weight of the thrust reverser,which is used for high bypass ratio turbofan engine, a stacking optimization and failure analysis of the honeycomb sandwich structure translating sleeve outer skin for thrust rever- ser is carried out. The work process was part.itioned into three phase： （ 1 ） Computing the pressure load of the translating sleeve outer skin with numerical computation; （2） Stacking optimization of the honeycomb sandwich structure was carried out and the new translating sleeve outer skin was 35% weight drops than the old one. Two commercial software, which named Nastran and Hypersizer,were used in this study; （3） The failure analysis for the translating sleeve outer skin based on the failure theory of sandwich panel shear crimping. The results of the study shows that the weight drops by 35% can be achieved by stacking optimization and it can work well under the work environment of the thrust reverser. Further more, the failure of shear crimping occurs on the translating sleeve outer skin when the load is more than 711.9 N/mm.