某航空发动机导流盘残余变形分析

The Residual Deformation Analysis of the Cooling Plate of an Aeroengine

首先用ANSYS软件对试样的力学性能曲线进行了弹塑性分析以验证分析方法,结果表明工程应力应变曲线仅适用于试样尺寸变化较小的小应变情况,真实应力应变曲线不同于工程应力应变曲线可应用于有限变形情况下,对于延性金属材料测试给出的真实应力应变曲线明显区别于工程应力应变曲线;然后采用材料真实应力应变曲线及随动强化准则对导流盘进行了弹塑性分析,并与试验结果进行了对比,结果吻合比较好。可以为后续改进设计及超转破裂试验设计提供依据。

In this paper,the elastic-plastic analysis of the stress-strain behavior of a standard test sample is performed by using finite element analysis software ANSYS to verify the analyzing method at first.Note that engineering stress and strain are most appropriate for small strains where the changes in specimen dimensions are small. True stresses and strains differ in that finite changes in area and length are specifically considered. For a ductile material,plotting true stress and strain from a tension test gives a curve that differs markedly from the engineering stress-strain curve. And then,based on the verified method,the residual deformation of the cooling plate is calculated and also compared with the results of measurement method.Furthermore,these results can provide a reference to improve the design of the cooling plate and give some technical guidance to the overspeed test as well as the burst test.