焊管2024，Vol.47Issue(11)：39-45,7.DOI:10.19291/j.cnki.1001-3938.2024.11.006
基于CEL模型的AZ91D镁合金搅拌摩擦焊材料流动行为数值模拟
Numerical Simulation of Material Flow Behavior of AZ91D Magnesium Alloy Friction Stir Welding Based on Coupled Euler-Lagrange Model
摘要
Abstract
Thermal-mechanical coupling finite element model of AZ91D magnesium alloy friction stir welding was established based on the Coupled Euler-Lagrange(CEL)method and Johnson-Cook constitutive model.The material flow behavior during the welding process was investigated by using tracer particles technique and combining temperature field,strain field and Euler field.The results show that the high temperature zone is located behind the stirring pin on the retreating side,and the temperature at the retreating side of the weld nugget is about 40℃higher than the advancing side.The peak temperature increases with increasing rotation speed and decreasing of welding speed.The area of high temperature region increases accordingly.The effect of welding speed on peak temperature is less than that of rotation speed.The distribution law of the equivalent strain field and temperature field is basically the same,and the plastic strain is correspondingly larger in the high temperature region.The material in the shoulder affected zone forms flash on the retreating side under the joint action of extrusion and shear of the shoulder.The material in the weld nugget moves from the front of the stirring pin to the retreating side and completes the backfill behind the stirring pin on the advancing side.When the rotation speed is increased to 950 rpm,the heat input is too high and material is lost,and the tunnel defects will be formed at the bottom of the advancing side.关键词
搅拌摩擦焊/AZ91D镁合金/耦合欧拉-拉格朗日模型/温度场/材料流动行为Key words
friction stir welding/AZ91D magnesium alloy/Coupled Euler-Lagrange model/temperature field/material flow behavior分类
矿业与冶金引用本文复制引用
刘澳,曹岳,华鹏,李先芬..基于CEL模型的AZ91D镁合金搅拌摩擦焊材料流动行为数值模拟[J].焊管,2024,47(11):39-45,7.基金项目
安徽省自然科学基金资助项目"铁素体耐热钢搅拌摩擦焊接接头组织演变和性能特征研究"(项目编号1808085ME150). （项目编号1808085ME150）
