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摘要：
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为了分析实际成形过程中AZ31B镁合金产生破裂的原因，并为改善工艺条件提供实用可靠的判据，采用实验和有限元模拟相结合的方法研究AZ31B镁合金的成形极限。分别对沿轧制方向、垂直于轧制方向、与轧制方向成45°的3种方向的试件进行单向拉伸实验，获得AZ31B镁合金的工程应力-工程应变曲线，获得材料的真实应力-真实应变曲线和塑性变形阶段的塑性应变。采用十字形试件进行了不同加载路径下的双向拉伸实验，并进行了相应的有限元模拟仿真，提取实验和模拟结果绘制成形极限图，对有限元模拟和实验结果进行对比分析，发现实验和有限元模拟结果基本吻合，左侧成形极限图高于右侧。
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The forming limit of AZ31B magnesium alloy was obtained by combining experiment and finite element simulation to analyze the causes of cracks in the actual forming process and provide practical and reliable criteria for improving process conditions. Then, the uniaxial tensile tests were conducted on the specimens along the rolling direction, perpendicular to the rolling direction, and 45° from the rolling direction to obtain the engineering stress-engineering strain curve of AZ31B magnesium alloy, the true stress-true strain curve of materials and the plastic strain at the plastic deformation stage. Furthermore, the biaxial tensile tests under different loading paths were performed by using the cross-shaped specimens, and the corresponding finite element simulation was carried out. Finally, the experimental and simulation results were extracted to draw the forming limit diagram, and the finite element simulation and experimental results were compared and analyzed. The result shows that the experiment and finite element simulation results are basically consistent, and the forming limit curve on the left is higher than that on the right.
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基金项目：
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国家自然科学基金资助项目(51475003)；北京市自然科学基金委员会-北京市教育委员会联合资助项目（KZ200010009041）
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作者简介：
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阎昱（1983-），女，博士，副教授，E-mail：anneyan@126.com；通讯作者：李嘉欣（1995-），女，硕士研究生，E-mail：448634002@qq.com
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