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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 effect of vacuum conditions and temperature on the initiation and propagation of short fatigue cracks in 316L steel under the control of symmetrical constant amplitude plastic strain (R = -1, △ εP = 2 × 10-3) was studied. By observing the length of the primary crack And the quantitative analysis of crack density on the surface of the material with the development of the cycle are given.According to the analysis of the length and depth of the main crack on the surface, the frontal expansion rate and cyclic J-integral of fatigue crack and the equivalent stress intensity under the plastic strain control The relationship between factors.