FEM Modeling of Crack Propagation in a Model Multiphase Alloy

在这篇论文，几个广泛地应用的破裂标准数字地首先被检验， crack-tip-region J 积分标准被证实更适用在有弹性塑料的多相的材料预言破裂角度。然后，在理想化的树枝状的二阶段的 Al-7 百分比 Si 合金的裂缝繁殖用 anelastic 塑料的有限元素方法被建模。有裂缝扩展的裂缝生长驱动力的变化也被表明。裂缝路径被 alpha 阶段的存在显著地在裂缝尖端附近影响，这被发现，并且裂缝生长驱动力到处急速地变化。最后，在二阶段的模型合金的模仿的破裂路径与试验性地观察的破裂路径相比。

In this paper, several widely applied fracture criteria were first numerically examined and the crack-tip-region Jntegral criterion was confirmed to be more applicable to predict fracture angle in an elastic-plastic multiphase material. Then, the crack propagation in an idealized an elastic-plastic finite element method. The variation dendritic two-phase AI-7%Si alloy was modeled using of crack growth driving force with crack extension was also demonstrated. It is found that the crack path is significantly influenced by the presence of α-phase near the crack tip, and the crack growth driving force varies drastically from place to place. Lastly, the simulated fracture path in the two-phase model alloy was compared with the experimentally observed fracture path.