(1. 燕山大学 国家冷轧板带装备及工艺工程技术研究中心，秦皇岛 066004;
2. 燕山大学 先进锻压成形技术与科学教育部重点实验室，秦皇岛 066004)
摘 要: 对AZ31B镁合金复杂截面零件固体颗粒介质成形过程进行研究。结合镁合金热态单向拉伸试验和有限元逆向法，确定预测热态下镁合金成形极限的Gurson-Tvergaard-Needleman(GTN)模型损伤参数。以镁合金异形件为研究对象，基于镁合金GTN损伤模型，采用有限元软件ABAQUS模拟该异形件的成形过程，分析不同工艺参数对工件壁厚和孔洞体积分数的影响，确定了该异形件的最佳成形工艺参数。设计了镁合金异形件固体颗粒介质成形模具并展开了相关试验，试验结果与基于GTN损伤模型的仿真结果基本吻合，并基于最佳模拟参数获得了合格的零件。
关键字: 镁合金；异形件；GTN模型；颗粒介质
（1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China;
2. Key Laboratory of Advanced Forging and Stamping Technology and Science, Ministry of Education, Yanshan University, Qinhuangdao 066004, China）
Abstract:The magnesium alloy part with complex section was researched based on solid granule medium forming (SGMF). Combined with magnesium alloy tensile test at high temperature and inverse finite element method, Gurson-Tvergaard-Needleman(GTN) parameters of magnesium alloy were obtained which can predict magnesium alloy forming limit. Based on magnesium alloy GTN model, magnesium alloy special shaped part forming process was simulated by ABAQUS. Wall thickness and void volume fraction of workpiece were analyzed with different technological parameters, and the optimum technological parameter was identified. Experimental dies of special shaped part were designed, and corresponding forming experiments were carried out. The experiment results are in good agreement with that of magnesium alloy by predicted GTN model, and qualified part is obtained with optimum technological parameter.
Key words: magnesium alloy; special shaped part; GTN model; granule medium
