| 一种基于累积损伤理论和裂纹尖端弹塑性应力场的裂纹扩展预测方法 |
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| 引用本文： | 钱怡,崔维成.一种基于累积损伤理论和裂纹尖端弹塑性应力场的裂纹扩展预测方法[J].船舶力学,2012(8):954-961. |
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| 作者姓名： | 钱怡 崔维成 |
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| 作者单位： | 1. 江南大学机械工程学院,江苏无锡214122;中国船舶科学研究中心,江苏无锡214082
2. 中国船舶科学研究中心,江苏无锡,214082 |
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| 基金项目： | 江苏省第四批“333高层次人才培养工程”科研项目“4500米载人潜水器载人舱用国产钛合金材料的疲劳断裂性能研究”资助 |
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| 摘 要： | 文章提出了一种预测疲劳寿命的应力循环叠加和损伤循环叠加的双重叠加方法。该方法依据累积损伤理论,通过分析变幅载荷下裂纹尖端的应力场,采用应力循环叠加的方法反映残余应力的影响;同时利用SWT应力应变和寿命的关系,循环叠加裂尖损伤。该方法能够很好地反映过载时裂纹扩展的迟滞效应,适合变幅载荷下疲劳寿命的评估分析。
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| 关 键 词： | 疲劳裂纹扩展 累积损伤 变幅载荷 疲劳寿命评估 |
An approach for predicting fatigue crack growth based on the cumulative damage theory and elasto-plastic stress field of crack tip |
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| QIAN Yi
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CUI Wei-cheng.An approach for predicting fatigue crack growth based on the cumulative damage theory and elasto-plastic stress field of crack tip[J].Journal of Ship Mechanics,2012(8):954-961. |
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| Authors: | QIAN Yi CUI Wei-cheng |
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| Institution: | 1 School of Mechanical Engineering,Jiangnan University,Wuxi 214122,China;2 China Ship Scientific Research Center,Wuxi 214082,China) |
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| Abstract: | A double accumulative approach of cyclic stress and cyclic damage accumulation for predicting fatigue crack growth is presented.The theoretical basis for calculating the fatigue crack length is damage theory.Residual stress was considered by analyzing the elasto-plastic stress field and accumulating the cyclic stress of crack tip.Using SWT equation the fatigue damage was obtained by cyclic damage accumulation of crack-tip.This method can represent the retardation of crack growth,and give a satisfactory prediction for fatigue crack growth especially for variable amplitude loading cases. |
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| Keywords: | fatigue crack propagation damage accumulation variable amplitude loading prediction of fatigue life |
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