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本文基于对疲劳裂纹尖端应力、应变分析,推导出一个估算疲劳裂纹扩展速率的公式 da/dN=A(△K~-K/(1-R)~2K_(IC)~2-△K~2)~ 从而建立起疲劳裂纹扩展速率和低周疲劳性能之间的关系。估算结果和四种材料的实验结果作了对比,吻合程度令人满意。
Based on the analysis of stress and strain at the tip of fatigue crack, a formula for estimating the fatigue crack growth rate is deduced: da / dN = A (△ K ~ -K / (1-R) ~ 2K ~ (IC) ~ 2- △ K ~ 2 ) ~ To establish the relationship between fatigue crack growth rate and low cycle fatigue performance. The results of the experiment are compared with the experimental results of four materials, and the degree of agreement is satisfactory.