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基于临界面法的三参数多轴疲劳损伤模型

Keywords: 多轴疲劳,临界平面方法,拉扭加载

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Abstract:

基于临界平面方法,提出一种能适用于拉-扭加载的多轴疲劳损伤模型.新的模型采用应力与应变的三参数相结合形式,不仅考虑了当前循环内临界面上最大剪应变范围和正应变变程对多轴疲劳损伤的贡献,还顾及了非比例附加强化效应和平均应力对多轴疲劳寿命的影响.该模型预测精度较高且本身不含有材料常数,便于实际工程应用.最后,将提出的多轴疲劳寿命估算模型结合Inconel718钢、高温GH4169合金和高温Haynes188合金等3种材料的多轴疲劳试验进行寿命预测验证,预测结果与试验结果吻合较好.

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