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Influence of Stress Re-distribution on Hydrogen-induced Fatigue Crack Propagation

机译：应力再分布对氢致疲劳裂纹扩展的影响

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In order to clarify influence of stress re-distribution effect on hydrogen-induced fatigue crack propagation, we investigated fatigue crack propagation rates and brittle-like fracture ratio. The experiments were conducted in nitrogen and hydrogen gas atmosphere with ferrite-pearlite steels having different pearlite ratio, respectively. The crack propagation rates and the brittle-like fracture ratio decreased as pearlite ratio increased. To explain the changes of crack propagation rates and fracture ratio, we proposed that the stress re-distribution effect causing stress and strain relaxation at a crack tip contributes to suppression of the hydrogen-induced fatigue crack propagation. As a verification, finite element methods were operated with models having different width of the hard phase and different distance between a crack tip and a hard phase in plane stress and strain conditions, respectively. The finite element method analysis showed that stress re-distribution effect was smaller in plane strain condition than that in plane stress condition, indicating that a large hardness difference is crucial in plane stress condition to suppress the hydrogen-induced fatigue crack propagation.
机译：为了弄清楚应力再分布效应对氢致疲劳裂纹扩展的影响，我们研究了疲劳裂纹扩展速率和脆性断裂率。实验分别在氮气和氢气气氛中用珠光体比率不同的铁素体-珠光体钢进行。随着珠光体比的增加，裂纹扩展速率和脆性断裂率降低。为了解释裂纹扩展速率和断裂率的变化，我们提出了导致裂纹尖端处的应力和应变松弛的应力再分布效应，有助于抑制氢引起的疲劳裂纹扩展。作为验证，在平面应力和应变条件下，分别使用具有不同硬相宽度和不同裂纹尖端与硬相距离的模型来操作有限元方法。有限元分析表明，平面应变条件下的应力再分布效果小于平面应力条件下的应力再分布效果，表明在平面应力条件下较大的硬度差对于抑制氢引起的疲劳裂纹扩展至关重要。

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