论文标题
氢辅助疲劳裂纹生长的凝聚区建模：捕获的作用
Cohesive zone modelling of hydrogen assisted fatigue crack growth: the role of trapping
论文作者
论文摘要
我们研究了微观结构陷阱在氢辅助疲劳裂纹生长中的影响。为此，提出并实施了一种新的配方，结合了多陷阱应力辅助扩散，基于机制的应变梯度可塑性以及氢和疲劳依赖性的内聚区模型。结果表明，加载频率与有效扩散率的比率控制疲劳裂纹生长行为。 \ emph {有益}陷阱的密度不参与断裂过程，导致疲劳裂纹的生长速率较低。鉴定出最大程度地减少抗植物敏感性的加载频率和碳化物陷阱密度的组合为合理的耐氢合金设计奠定了基础。
We investigate the influence of microstructural traps in hydrogen-assisted fatigue crack growth. To this end, a new formulation combining multi-trap stress-assisted diffusion, mechanism-based strain gradient plasticity and a hydrogen- and fatigue-dependent cohesive zone model is presented and numerically implemented. The results show that the ratio of loading frequency to effective diffusivity governs fatigue crack growth behaviour. Increasing the density of \emph{beneficial} traps, not involved in the fracture process, results in lower fatigue crack growth rates. The combinations of loading frequency and carbide trap densities that minimise embrittlement susceptibility are identified, providing the foundation for a rational design of hydrogen-resistant alloys.
