| 基于疲劳累积损伤的弹塑性裂纹扩展分析 |
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| 引用本文： | 戴振羽.基于疲劳累积损伤的弹塑性裂纹扩展分析[J].西南交通大学学报,1992,5(6):12-18. |
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| 作者姓名： | 戴振羽 |
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| 作者单位： | 西安交通大学应用力学研究所 |
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| 摘 要： | 根据裂尖疲劳损伤累积导致材料破坏的观点，发展了一个弹塑性疲劳裂纹扩展模型.
假设在裂纹前缘HRR场内存在一个高应变区，该区长度x*等于材料常数D、其塑性
变程是△尹，由N区朋on公式求出对应于△a*的疲劳破坏循环数N白，则疲劳裂纹扩
展速率就是x‘/N，。新模型建立了材料低周疲劳特性与弹塑性裂纹扩展规律之间的
联系。由模型计算得到的弹塑性裂纹扩展速率与实验结果的比较表明，二者吻合良
好。
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| 关 键 词： | 低周疲劳 累积损伤 裂纹扩展 |
Analysis of Elastoplastic Crack Growth Based on Cumulative Fatigue Damage |
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| Dai Zhenyu Res.Inst.of Appl.Mech..Analysis of Elastoplastic Crack Growth Based on Cumulative Fatigue Damage[J].Journal of Southwest Jiaotong University,1992,5(6):12-18. |
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| Authors: | Dai Zhenyu ResInstof ApplMech |
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| Affiliation: | Dai Zhenyu Res.Inst.of Appl.Mech. |
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| Abstract: | A model of elastoplastic fatigue crack growth based on cumulative damage analysis near crack tip is developed. It is assumed that at the crack tip there exists a small highly strained area, the width of which X~* is equal to D defined by Hutchinson. Musuva's plane stress solution is used to calculate the plastic strain range in this area. For the known strain range the number of cycles N~* necessary for material failure is obtained from Manson's relation. Then the fatigue crack growth rate is calculated by the ratio X~*/N~*. The results are in good agreement with those from experiments. |
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| Keywords: | low cycle fatigue cumulative damage crack growth |
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