三维应力状态下高温低周疲劳寿命分析

Analysis of Low Cycle Fatigue Life at Elevated Temperature under Three- Dimensional Stress State

通过带缺口的圆柱形 L D8铝合金试样的高温低周疲劳试验 ,并应用 TMF程序 ,进行了轴对称问题的循环应力应变计算 ,探讨了应用当量应变范围评价三维低周疲劳特性。研究结果表明 ,三维应力状态下 ,当量应变范围可以作为三维高温低周疲劳的有效力学参量。

In this paper,low cycle fatigue experiments at elevated temperature are finished in aluminum alloy LD8specimens with two kinds of notches.The cyclic strain and stress is cal- culated by means of the program TMF.The results of experiments and calculations show that e- quivalent strain range can be as the parameters of low cycle fatigue life.