本文研究了5C钢和两种不同强度的40CrNiMo钢长、短裂纹近门槛区域的疲劳裂纹扩展性能。并测定了它们的闭合效应和断面粗糙度,结果表明:长、短裂纹的扩展速率和门槛值差别与钢强度有关,5C钢短裂纹的门槛值只是长裂纹的一半。长、短裂纹疲劳特性的差别可用闭合效应来解释。
Characteristics of tong (7mm) and short (0.2-0.4mm) fatigue crack propagation in 5C and 40CrNiMo steels with two stength levels have been studied. The fracture surface roughness and crack closure have been measured. It was found that the fatigue crack growth rate of short crack in low strength 5C steel is anomalously higher at a given stress intensity amplitude, but the threshold △K_(th) is lower. The difference in the growth behavior and threshold △K_(th) between long and short crack reduced with increasing material strength, that may be explained by crack closure effect.
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