球锥组合体在热外压作用下的稳定性

球锥组合体作为飞行器头部,热外压稳定性是结构设计的主要问题。本文对薄壳结构进行稳定性分析,将临界外压的有限元计算值与试验修正的理论值进行对比,获得有限元分析的修正系数为0.8;然后采用数值和试验相结合的方法、并考虑材料力学性能的温度效应,对复合材料球锥组合体在热外压载荷下的稳定性进行研究,高温下材料性能退化对临界载荷的影响显著,加热不均匀对临界载荷也有一定影响,线胀系数对临界载荷的影响很小。

Stability Research of Blunted Cone-FlareUnder Thermal Load and External Pressure

As the head of an aircraft, the blunted cone-flare undergoes thermal load, external pressure in supersonic
flow, and the stability are most important issues in the structural design. In the paper, the stability of thinwalled
structure is researched. First, the correction factor of FEM simulation is 0. 8, which is obtained by comparing
the FEM critical load and the test-corrected theoretical solutions. Then, the thermo-stability of composite blunted
cone-flare under thermal load and external pressure is analyzed by combining FEM and test, and considering the material
mechanical characters under different temperatures.