摘要
研究在对称恒幅塑性应变（Ｒ＝－１，△εＰ＝２×１０－３控制下，真空条件及温度效应对３１６Ｌ钢的塑性疲劳短裂纹萌生和扩展行为的影响。通过观测表面主裂纹长度及裂纹密度随循环周次发展规律给出材料表面损伤的定量分析。结合对表面主裂纹长度与深度的分析建立起疲劳短裂纹前沿扩展速率与循环Ｊ积分及基于塑性应变控制下等效应力强度因子的关系。
The influences of temperature and environment on the initiation and growth of small fatigue cracks in a steel 316L were studied using smooth specimens under plastic strain-controlled condition(R=-1,△εP=2×10-3).A quantitative analysis of surface domage was given by measuring the variation in the microcrack density and the length of the primary cracks as a function of the cycle number.Analyses of the length and depth of surface cracks in the tested specimens were performed.As a result the crack tip growth rate as a function of cyclic J-integral or strain-based intensity factor was established.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
1996年第4期28-33,共6页
Journal of Iron and Steel Research
关键词
奥氏体
不锈钢
低周疲劳
裂纹萌生
裂纹扩展
austenic stainless steel,low-cycle fatigue,crack initiation, crack growth
