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本文研究了超载对16Mn疲劳裂纹扩展速率的影响。试样为中心贯穿裂纹试板,基本载荷应力比R=0,在试验中包括了超载比和超载时裂纹长度的影响,得出了与前人基本相同的结论,即迟滞效应随超载比的增加而提高、随超载时裂纹长度的增长而下降。采用Willenborg和Matsuoka两种模型,计算迟滞寿命并与实测值作了比较:按Willenborg模型计算,在超载比较小时与实测值十分接近,超载比较大时则远远偏离实测值,且偏于不安全。按Matsuoka模型计算与实测值基本接近,且(?)部分偏安全。初步证实了Matsuoka模型是估算16Mn材料超载迟滞效应的比较理想的模型。
This paper studies the effect of overloading on the fatigue crack growth rate of 16Mn. The test specimen was taken as the center through the crack test plate. The basic load stress ratio R = 0, including the influence of the overload ratio and the crack length during overload, obtained the same conclusion as the predecessors. The hysteresis effect with overload ratio Increase and increase, with the overload growth of the crack length and decline. Using Willenborg and Matsuoka models, the hysteresis life is calculated and compared with the measured value. According to the Willenborg model, it is close to the measured value when the overload is small and far from the measured value when the overload is relatively large, . According to the Matsuoka model, the calculated value is basically close to the measured value, and the (?) Part is safer. The preliminary validation of the Matsuoka model is an ideal model for estimating the hysteresis effect of 16Mn material.