复杂受载承力机匣的强度及疲劳寿命

本文首先论述了航空发动机承力机匣应力分布计算与试验,指出这类机匣的有限元计算,一般可分为:模型估算、真实机匣应力分布计算和局邮结构的详细计算。其次介绍了圆筒机匣热应力理论与试验研究的基本方法与主要成果。最后从机匣低循环疲劳寿命预测的初步探索的角度,说明了缺口构件在常温与高温条件下的低循环疲劳寿命预测工作的一些进展。

STRENGTH ANALYSIS AND FATIGUE LIFE PREDICTION FOR LOAD-BEARING CASE OF AEROENGINE UNDER COMPLEX LOADING

The calculations and tests of stress distributions for load-bearing case of aeroengine are presented. It is noted that the stress finite element analysis of the case may be divided into three steps, namely model evaluation, stress distribution calculation of the actual case and detailed calculation of partial structures. The basic approach and major achievements of the theoretical and experimental researches on thermal stresses in cylindrical case are described. Finally, the progress in the low-cycle fatigue life, prediction of notched members at room and elevated temperatures, and the essential feactures of the finite element analysis program for elastoplastic creep are briefed.