长沙理工大学学报（自然科学版）2011，Vol.8Issue(1)：56-60,5.
一种新型的低周疲劳裂纹扩展速率模型
A new model of low cycle fatigue crack growth rate
摘要
Abstract
The plastic strain at crack tip of low cycle fatigue and the strain distribution on the cyclic plasticity zone of crack tip obey the HRR theoretical solution approximately were analyzed in this paper. A new low cycle fatigue crack growth mathematical model is derived by the combination of these mechanisms which include the crack tip sharpen, the passivation rev crack and crack interaction mechanics and the Ramberg-Osgood's circulation stressstrain curve and the Coffin-Manson's fatigue life curve. The experimental data of low cycle fatigue crack growth rate which belongs to the 30CrlMolV and St-4340 are contrasted. The comparison result shows that the low cycle fatigue crack growth rate model adopted in this paper is able to predict reasonably the low cycle fatigue crack growth rate of the materials used.关键词
低周疲劳/裂纹扩展/模型/塑性应变Key words
low cycle fatigue/ crack growth/ model/ plasitc strain分类
通用工业技术引用本文复制引用
吴晓松,陈荐,何建军,任延杰,高鹏..一种新型的低周疲劳裂纹扩展速率模型[J].长沙理工大学学报（自然科学版）,2011,8(1):56-60,5.基金项目
国家自然科学基金资助项目(50775015) （50775015）
