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首页> 外文期刊>Materials Science and Engineering >Microstructure modeling and crystal plasticity simulations for the evaluation of fatigue crack initiation in α-iron specimen including an elliptic defect
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Microstructure modeling and crystal plasticity simulations for the evaluation of fatigue crack initiation in α-iron specimen including an elliptic defect

机译：用于评估包括椭圆缺陷的α-铁试样疲劳裂纹萌生的微观结构建模和晶体可塑性模拟

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In this study, fatigue crack initiation in pure α-iron is investigated through a microstructure-sensitive framework. At first, synthetic microstructures are modeled based on an anisotropic tessellation that accounts for the information of the grains morphology extracted from electron backscatter diffraction (EBSD) analysis. Low-cycle fatigue experiments under strain-controlled conditions are conducted in order to calibrate a crystal plasticity model and a J_2 model including isotropic and kinematic hardening. A critical plane fatigue indicator parameter (FIP) based on the Tanaka-Mura model is then presented to evaluate the location and quantify the driving force for the formation of a crack. The FIP is averaged over several potential crack paths within each grain defined by the intersection between a given slip plane and the plane of the model thus accounting for both the lattice orientation and morphology of the grain. Several fatigue simulations at various stress amplitudes are conducted using a sub-modeling technique for the attribution of boundary conditions on the polycrystalline aggregate models including an elliptic defect. The influence of the microstructure attributes and stress level on the location and amplitude of the FIP are then quantified and discussed.
机译：在这项研究中，通过对微观结构敏感的框架研究了纯α-铁中的疲劳裂纹萌生。首先，基于各向异性镶嵌细分对合成微结构进行建模，该镶嵌细分考虑了从电子背散射衍射（EBSD）分析中提取的晶粒形态信息。为了校准晶体可塑性模型和包括各向同性和运动学硬化的J_2模型，进行了在应变控制条件下的低周疲劳实验。然后提出了基于Tanaka-Mura模型的临界平面疲劳指标参数（FIP），以评估位置并量化形成裂纹的驱动力。 FIP在给定滑移面和模型平面之间的交点定义的每个晶粒内的几个潜在裂纹路径上取平均值，因此考虑了晶粒的晶格取向和形态。使用子建模技术对边界条件归因于包括椭圆形缺陷的多晶聚集体模型进行了几种不同应力振幅下的疲劳模拟。然后，量化和讨论了微观结构属性和应力水平对FIP的位置和幅度的影响。

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