【摘要】 为了研究高温两级和多级疲劳蠕变载荷作用下计及载荷历程效应的寿命预测方法,文中首先基于韧性耗竭理论提出一种非线性疲劳蠕变损伤演化模型,并通过316L不锈钢高温单级应力、温度疲劳蠕变试验,确定模型中的损伤指数,以该损伤模型结合多级加载的损伤破坏准则对高温两级应力、温度疲劳蠕变载荷作用下316L钢的寿命进行预测,得出与试验较为一致的结果。更多还原

【Abstract】 In order to investigate high temperature 2-step and multi-step fatigue creep life prediction method considering the load history effect, a nonlinear fatigue creep damage evolution model was presented based on the toughness exhaustion theory.The damage exponent was obtained by the high temperature 1-step stress and temperature fatigue creep test of 316L stainless steel.High temperature fatigue creep life under 2-step stress and temperature load was predicted by the damage evolution model and the failure rule under multi-step load.The predicted results were in good agreement with the experimental ones.更多还原