Abstract

Simulation model accuracy of quench induced residual stress in wrought magnesium alloy Mg‒Gd–Y–Zr–Ag–Er is tested by applying both isotropic and anisotropic criteria models in residual stress FEM simulation. Both hexagonal close-packed (HCP) lattice structure and asymmetry are considered in the manufacturing process. The distributions of residual stress in isotropic and anisotropic criteria models differ both in distribution and in value, which is due to stress-strain nonuniformity in extrusion direction (ED) and long transverse direction (LTD). Comparing the experimental and predicted errors of the two models, the anisotropic model improves the prediction accuracy by 8.3% in ED and 4.8% in LTD. Residual stress in LTD is always larger than that in ED by the XRD method, and the average deviation between the XRD method and the hole-drilling method is reduced through electropolishing.

中文翻译：

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镁合金淬火残余应力各向同性和各向异性屈服准则模型的比较

摘要

通过在残余应力 FEM 模拟中应用各向同性和各向异性标准模型，测试了变形镁合金 Mg-Gd-Y-Zr-Ag-Er 中淬火引起的残余应力的模拟模型精度。在制造过程中同时考虑了六方密排 (HCP) 晶格结构和不对称性。各向同性和各向异性准则模型中残余应力的分布在分布和数值上都不同，这是由于挤压方向（ED）和横向长方向（LTD）的应力应变不均匀造成的。比较两种模型的实验和预测误差，各向异性模型在 ED 中将预测精度提高了 8.3%，在 LTD 中提高了 4.8%。通过 XRD 方法，LTD 中的残余应力始终大于 ED 中的残余应力，