锻压技术

变形镁合金非弹性回复精准表征

英文标题：Accurate characterization on inelastic recovery for deformation magnesium alloy

单位：1.燕山大学机械工程学院 2. 燕山大学国家冷轧板带装备及工艺工程技术研究中心

分类号：TG386

出版年,卷(期):页码：2021,46(9):85-89

摘要：

与FCC和BCC金属相比，HCP结构的镁合金卸载后具有大的非弹性回复应变。这种非弹性回复行为是制约镁合金板材回弹预测精度的重要因素。研究表明，弦模量法和Yoshida2020模型均无法准确表征AZ31变形镁合金板材卸载后的非弹性回复应变。为精准表征镁合金的非弹性回复，引入应力因子，结合指数函数形式提出了一种与应力相关的变弹性模量模型，即SDE（Stress Dependent Exponential）模型。与实验结果相比，该模型可以精准计算变形镁合金卸载的力学响应。卸载后的非弹性回复使得残余应变小于线弹性卸载。通过有限元软件，模拟了常弹性模量和应力相关的变弹性模量单轴拉伸卸载后的残余应变。研究结果表明，常模量卸载后的残余应变最大值为1.08%，而变模量卸载后的残余应变最大值为0.94%。

Compared with FCC and BCC metals, a large inelastic recovery strain is produced after unloading for magnesium alloy with HCP structure, which is the key factor restricting the springback prediction accuracy of magnesium alloy sheet. The results show that both Chord modulus and Yoshida2020 models are invalid to predict the inelastic recovery strain of AZ31 deformation magnesium alloy sheet after unloading. In order to accurately predict the inelastic recovery of magnesium alloy, a stress dependent variable elastic modulus model was proposed by introducing a stress factor and exponential function, that is SDE (Stress Dependent Exponential) model. Compared with the experimental results, the model accurately calculated the unloading mechanical response of wrought magnesium alloy, and the inelastic recovery after unloading made the residual strain less than the residual strain after linear elastic unloading. Then, the residual strain after uniaxial tensile unloading with constant modulus and stress dependent variable elastic modulus was simulated by finite element software. The results show that the maximum residual strain value after unloading with constant modulus is 1.08%, and the maximum residual strain value after unloading with variable modulus is 0.94%.

基金项目：

国家自然科学基金资助项目（51771166）；河北省杰出青年基金资助项目（E2019203452）；河北省高层次人才资助项目（A202002002）；华中科技大学材料成形与模具技术国家重点实验室（P2020-013）；河北省研究生创新资助项目（CXZZBS2020053）

杨冲（1993-），男，博士研究生 E-mail：1750796646@qq.com 通信作者：石宝东（1982-），男，博士，教授 E-mail： baodong.shi@ysu.edu.cn

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