| 预测低周疲劳寿命的一种新方法 |
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| 引用本文： | 刘康林,黄小平.预测低周疲劳寿命的一种新方法[J].船舶力学,2010(Z1). |
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| 作者姓名： | 刘康林 黄小平 |
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| 作者单位： | 福州大学;上海交通大学海洋工程国家重点实验室; |
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| 摘 要： | 从低周疲劳损伤可由疲劳过程中的非弹性响应来反映的理念出发,以循环弹性余应变能密度来表征循环应力应变曲线的非线性部分偏离线性的程度,建立了基于循环弹性余应变能密度为基本参量预测低周疲劳寿命的新方法。采用30CrNiMo8钢的疲劳试验结果和文献中对某高温合金的疲劳试验结果,对该预测模型的预测结果和Manson-Coffin公式、三参数幂函数模型预测结果进行了对比分析,结果表明,文中提出的预测模型的预测结果与试验结果吻合良好,预测精度高于Manson-Coffin公式的预测精度,并接近或高于三参数幂函数模型的预测精度。
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| 关 键 词： | 低周疲劳 寿命预测 缺陷 余应变能密度 损伤 |
A new method for low cycle fatigue life prediction |
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| LIU Kang-lin,HUANG Xiao-ping.A new method for low cycle fatigue life prediction[J].Journal of Ship Mechanics,2010(Z1). |
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| Authors: | LIU Kang-lin HUANG Xiao-ping |
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| Institution: | 1 Fuzhou University;Fuzhou 350002;China;2 State key Lab of Ocean Engineering;Shanghai Jiao Tong University;Shanghai 200030;China |
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| Abstract: | Owing to the fact that low cycle fatigue(LCF) of material is a process of energy dissipation and re-lates to inelastic response of material in the process of fatigue,area between the inelastic part of cyclic stress-strain curve and its tangential line at a slope of E(elastic modulus of material),which is similar to the in-elastic part of complementary strain energy density in the figure of stress-strain curve of material,is used to describe the process of fatigue damage.A new approach to determine LCF life ... |
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