一个用于低周疲劳寿命预测的损伤函数

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A Damage Function Used for Prediction of Low Cyclic Fatigue Life

摘要: 选择循环塑性应变能作为损伤变量,建立了它的瞬态响应数字模型,采用损伤力学分析方法,导出了计及循环相关的非线性疲劳损伤函数,得到了用于低周疲劳寿命预测的数学公式。利用该损伤函数预测的低周疲劳寿命与试验结果符合较好。
- 循环塑性应变能 /
- 疲劳损伤 /
- 寿命预测
Abstract: In this paper,the cyclic plastic strain energy is acted as damage variable and its mathematical model of transient response is established.The nonlinear fatigue damage function is given by means of the damage mechanical method.The formula used for prediction of low cyclic fatigue life is obtained from this damage function which takes into account the cyclic relativity of cyclic plastic strain energy.The low cyclic fatigue life predicted by this formula is in correspondence with the experimental result.
- cyclic plastic strain energy /
- fatigue damage /
- life prediction

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