FEM‐BEM Code for the Multiscale Modeling and Computer Aided Design of Wire Drawing Technology for Magnesium Alloys
FEM‐BEM Code for the Multiscale Modeling and Computer Aided Design of Wire Drawing Technology for Magnesium Alloys
复制标题
镁合金拉丝技术多尺度建模和计算机辅助设计的 FEM-BEM 代码
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
D. Byrska
中科院分区：
文献类型：
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作者：
A. Milenin;P. Kustra;D. Byrska
研究了生物相容性镁合金超细拉丝工艺参数的确定问题。所考虑的合金的独创性是在宏观尺度上与小应变（0.07-0.09）相关的晶间断裂机制。从退火恢复塑性的角度出发，证明了细观裂纹出现前的材料状态是材料的最佳状态。为了预测拉伸过程中材料的这种状态，需要建立晶间断裂模型。在此基础上，提出了细观尺度下裂纹起裂的边界元模型。现场试验允许观察变形过程中的微观结构，用于本模型的校准和验证。通过拉伸试验和份额试验，获得了MgCa0.8和Ax30镁合金微观断裂模型的经验参数。将所建立的模型在Drawing 2d软件中实现。采用实验拉伸工艺对直径70µm的超细金属丝进行了中尺度模拟，验证了中尺度模拟的结果。
The purpose of the paper is the problem of determination of parameters of hyperfine wire drawing process of biocompatible magnesium alloys. The originality of the considered alloys is the intergranular fracture mechanism associated with small strains (0.07–0.09) in macro‐scale. It was proven that the material state just before appearance of the meso‐cracks is the optimal state of material from the point of view of the restoration of the plasticity by annealing. The forecasting of this material state during drawing process requires the development of the model of intergranular fracture. In this case, new BEM model of the cracks initiation in meso‐scale is proposed. The in situ tests, which allowed observation of the microstructure during deformation, are used for the calibration and validation of the present model. The empirical parameters of the fracture model in micro‐scale for MgCa0.8 and Ax30 magnesium alloys are obtained using tensile and share tests. The developed model was implemented to the Drawing 2d software. The results of meso‐scale simulation were verified by using the experimental drawing process of the hyperfine wires (diameter 70 µm) according to developed technology.