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首页> 外文期刊>Journal of Materials Engineering and Performance >Biaxial Fatigue Life Predicted by Crack Growth Analysis in Various Material Microstructures Modeled by Voronoi-Polygons
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Biaxial Fatigue Life Predicted by Crack Growth Analysis in Various Material Microstructures Modeled by Voronoi-Polygons

机译：通过Voronoi-Polygons建模的各种材料微结构中的裂纹扩展分析预测双轴疲劳寿命

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Fatigue life is affected by the crack growth behavior that depends on the material microstructure as well as the stress biaxiality. By considering such effects on crack growth, a numerical procedure for predicting failure life in biaxial fatigue of materials with different microstructures was proposed in this study. Such a procedure will be helpful in the material design for higher performance of fatigue resistance in a material. The microstructure of a material was first modeled using Voronoi-polygons, and the crack initiation was analyzed as the result of slip-band formation in individual grains in the modeled microstructure. In the analysis, stress states in individual grains were randomized so that the average stress state should be equivalent to the bulk stress state. An algorithm for the crack growth analysis was established as a competition between the crack-coalescence growth and the propagation as a single crack. The failure life was statistically predicted based on the crack growth behavior simulated for 40 distinct microstructural configurations, which were generated by randomizing shapes of Voronoi-polygons for the same material. By applying the proposed procedure, simulations were conducted for experimental conditions of fatigue tests, which had been conducted under axial, torsional, and combined loading modes using circumferentially notched specimens of pure copper, medium carbon steel, and (α + β) and β titanium alloys. In this case, 40 different failure-lives were obtained for each combination of material and loading mode. It was revealed that the failure lives observed in experiments were almost covered by the life-ranges between the minimum and the maximum lives given in simulation. Statistical characteristics in simulated life-distributions were investigated using Weibull distribution function and its related statistical parameters.
机译：疲劳寿命受裂纹扩展行为的影响，裂纹扩展行为取决于材料的微观结构以及应力双轴性。考虑到这种对裂纹扩展的影响，本研究提出了一种预测具有不同微观结构的材料双轴疲劳失效寿命的数值程序。这样的程序将有助于材料设计中材料的更高抗疲劳性能。首先使用Voronoi多边形对材料的微观结构进行建模，并在建模的微观结构中对裂纹萌生进行了分析，作为单个晶粒中滑带形成的结果。在分析中，单个晶粒中的应力状态是随机的，因此平均应力状态应等于体应力状态。建立了裂纹扩展分析算法，将其作为裂纹凝聚生长与单个裂纹扩展之间的竞争。基于模拟的40种不同的微观结构构型的裂纹扩展行为，从统计学上预测了失效寿命，这些构型是通过将相同材料的Voronoi多边形形状随机化而生成的。通过采用建议的程序，对疲劳试验的实验条件进行了模拟，该试验是在轴向，扭转和组合载荷模式下进行的，使用的是纯铜，中碳钢以及（α+β）和β钛的周向缺口试样合金。在这种情况下，每种材料和加载方式的组合都可获得40种不同的失效寿命。结果表明，在实验中观察到的失效寿命几乎被模拟给出的最小和最大寿命之间的寿命范围所覆盖。利用威布尔分布函数及其相关的统计参数研究了模拟生命分布中的统计特征。

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