利用位错密度法研究不锈钢断裂对三轴度系数和节点参数的敏感性

Yanis Rassoul, L. Benabou, M. Ould Ouali
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引用次数: 0

摘要

本研究致力于分析三轴系数和洛德参数对不锈钢管韧性断裂的影响。选择了一个基于微机械的模型,该模型包含多种变形机制,并在位错密度理论的框架内制定,用于模拟 316L 不锈钢的粘塑性行为。在将该模型实施到有限元代码 Abaqus 2020 中并根据现有实验结果校准模型参数后,对健康和有缺口的管状试样进行了模拟。为了改变三轴度和洛德角,我们使用了不同尺寸和缺口形状的试样。结果表明,模型能够再现管状结构的实验结果。结果发现,试样的强度和延展性取决于三轴系数和 Lode 参数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sensitivity of Stainless Steel Fracture to Triaxiality Factor and Lode Parameter Using Dislocation Density Approach
This work is devoted to the analysis of the influence of the triaxiality factor and the Lode parameter on the ductile fracture of a stainless steel tube. A micromechanical-based model incorporating several deformation mechanisms and formulated in the framework of the dislocation density theory is chosen to model the viscoplastic behavior of the 316L stainless steel. After adaptation of the implementation of the model into the finite element code Abaqus 2020 and the calibration of the model parameters with experimental available results, simulations of healthy and notched tubular specimens were carried out. In order to vary the triaxiality and Lode angle, we used specimens of different sizes and notch shapes. The results showed the capacity of the model to reproduce the experimental results of tubular structures. It was found that the strength and ductility of the specimens depend on the Triaxiality Factor and Lode Parameter.
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