电阻法检测金属构件损伤及预测疲劳寿命

基金项目:

国家自然科学基金资助项目(50539090)；引进人才科研启动基金资助项目；河海大学自然科学基金资助项目(2007418311)

详细信息

Damage Measurement and Fatigue Life Prediction for Metallic Components by Electrical Resistance Method

摘要: 基于非线性连续疲劳损伤理论，考虑应力幅带来的非线性累积效应，以电阻值定义金属构件损伤参量，提出基于电阻变化的金属高周疲劳损伤累积模型及疲劳载荷应力幅对损伤参量的影响函数，给出通过测量电阻来检测金属构件疲劳损伤状态的方法及预测高周疲劳剩余寿命的理论公式，并通过45号钢高周疲劳试验进行验证。
- 金属构件 /
- 疲劳损伤 /
- 电阻法 /
- 寿命预测
Abstract: Presented is a life prediction model based on the variation of electrical resistance for metallic components experiencing high cycle fatigue load. Combining nonlinear continual fatigue damage accumulation theories with calculation formula for electrical resistance of metals, and taking into account the nonlinear effects of cycle stress on damage accumulation, a promising damage measuring method and a fatigue life prediction model concerned only with variation of electrical resistance are then proposed. The effect of cycle stress on nonlinear damage factor is analyzed as well. Experimental data from 45# steel agree well with the theoretical results adopting the proposed model in this paper.
- Metallic components /
- Fatigue damage /
- Electrical resistance method /
- Life prediction

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