摘要
利用搅拌摩擦焊及变薄旋压复合工艺获得2024铝合金管材,通过胀形实验研究退火处理后不同焊接匹配系数铝合金焊管的胀形性能及环向壁厚分布。利用数值模拟分析不同焊接匹配系数焊管胀形时焊缝与母材的变形差异及应力、应变发展过程。结果表明:高焊接匹配系数焊管较低焊接匹配系数焊管表现出更高的膨胀率和更均匀的环向壁厚分布。利用数值模拟结合力学分析得出,高焊接匹配系数的焊管,焊缝等效应力高于母材,焊缝处于双拉的应变状态;而低焊接匹配系数的焊管焊缝的等效应力稍低于母材,焊缝处于环向受拉,而轴向先受压后受拉的应变状态。高焊接匹配系数利于焊缝协调母材变形,从而使焊管获得较好的胀形能力。
A 2024 aluminum alloy tube was prepared by friction stir welding and spinning. The bulging performance and circumferential thickness distribution of the welded tube with different strength matching coefficients were investigated by the hydro bulging experiment. The deformation behaviors and the stress and strain history of the welded tube during hydro-bulging were investigated by finite element analysis （FEA） and mechanics analysis. The results indicate that the welded tube with high strength matching coefficient shows higher bulge ratio and more uniform circumferential thickness distribution than that with low strength matching coefficient. The results of FEA and mechanics analysis show that the equivalent stress on the weld is higher than that of the base material and the strain state of the weld is biaxial tension for the welded tube with high strength matching coefficient. On the contrary, the equivalent stress on the weld is lower than that of the base material for the welded tube with low strength matching coefficient, and the tensile strain occurs in the circumferential of the weld, while the compressive strain firstly occurs in the axial direction of the weld and then gradually transforms to tensile strain. The welded tubes with high strength matching coefficient possess high formability during hydro bulging for that the welds with high strength promote the deformation of the base material.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2012年第12期2113-2117,共5页
Rare Metal Materials and Engineering
关键词
液压胀形
搅拌摩擦焊
铝合金焊管
塑性变形
hydro bulging
friction stir welding
aluminum alloy welded tube
plastic deformation
