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Material characterization and finite element modelling of cyclic plasticity behavior for 304 stainless steel using a crystal plasticity model

机译：使用晶体塑性模型对304不锈钢循环塑性行为的材料表征和有限元建模

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Low cycle fatigue tests were carried out for a 304 stainless steel at room temperature. A series of experimental characterisations, including SEM, TEM, and XRD were conducted for the 304 stainless steel to facilitate the understanding of the mechanical responses and microstructural behaviour of the material under cyclic loading including nanostructure, crystal structure and the fractured surface. The crystal plasticity finite element method (CPFEM) is a powerful tool for studying the microstructure influence on the cyclic plasticity behaviour. This method was incorporated into the commercially available software ABAQUS by coding a UMAT user subroutine. Based on the results of fatigue tests and material characterisation, the full set of material constants for the crystal plasticity model was determined. The CPFEM framework used in this paper can be used to predict the crack initiation sites based on the local accumulated plastic deformation and local plastic dissipation energy criterion, but with limitation in predicting the crack initiation caused by precipitates.
机译：在室温下对304不锈钢进行了低循环疲劳测试。对304不锈钢进行了一系列实验表征，包括SEM，TEM和XRD，以帮助理解材料在循环载荷下的机械响应和微观结构行为，包括纳米结构，晶体结构和断裂表面。晶体可塑性有限元方法（CPFEM）是研究微观结构对循环可塑性行为影响的有力工具。通过对UMAT用户子例程进行编码，将该方法并入了商用软件ABAQUS。根据疲劳测试和材料表征的结果，确定了晶体可塑性模型的全套材料常数。本文中使用的CPFEM框架可用于基于局部累积塑性变形和局部塑性耗散能准则来预测裂纹萌生部位，但在预测由沉淀物引起的裂纹萌生方面存在局限性。

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