本文根据三点弯曲试样的J积分计算式及da/dN=C_1(ΔJ)~r的实验事实,导出了三点弯曲试样用ΔJ表征的从线弹性直至全面屈服范围内疲劳裂纹亚临界扩展速率表达式其中高周疲劳近似为它和Paris关系是一致的;而高应变疲劳则为它和Coffin-Manson关系相当。16Mn钢在空气和饱和H_2S水溶液介质中的实验结果表明上述公式是正确的,饱和H_2S水溶液明显加速了疲劳裂纹的亚临界扩展。
Based on both the calculating formula for J-integral determined by means of TPB type specimen and the experimental evidence of da/dN=C_1(ΔJ)~r ,an expression of subcritical fatigue crack growth rate characterized by AJ from TPB specimen from the linear elastic to complete yielding region has been derived as follows: For high-cycle fatigue crack, its approximate growth rate will be which seems to be identical with the Paris' relation. For high-stain fatigue crack, it may be which is analogous to the Coffin-Manson's relation.These formulae are confirmed by the experimental results for steel 16Mn specimens in the environment of atmosphere or aqueous H_2S saturated solution. It is also indicated that the aqueous H_2S saturated solution may aggravate the subcritical growth rate of fatigue cracking.
参考文献
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