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本文在塑性增量理论的基础上,利用有限元素法求解了某两型发动机涡轮叶根一榫槽的弹塑性应力分析问题.数值计算是在复旦大学719机上进行的.计算结果表明:叶根-榫槽部位的弹塑性应力分布显著地不同于纯弹性解;由于考虑了弹塑性影响,应力水平显著降低.为了考虑加载-卸载过程的影响,我们还计算了在一次加载后卸载造成的残余应力,这对分析涡轮盘的工作状况及断裂特性是甚为重要的。
Based on the plastic incremental theory, the finite element method is used to solve the elasto-plastic stress analysis of a mortise-and-tenoned groove of turbine blades in a two-type engine. The numerical calculation is carried out on 719 Fudan University. The calculation results show that: - The elastic-plastic stress distribution at the tongue-and-groove section is significantly different from the pure elastic solution; the stress level is significantly reduced due to the elastic-plastic effect considered. To account for the effect of the loading-unloading process, we also calculated the residuals caused by unloading after a single loading Stress, which is important to analyze the working conditions and fracture characteristics of the turbine disk.