2A14铝合金搅拌摩擦焊缝根部应力应变模拟与分析  

Simulation and Analysis of 2A14 Aluminum Alloy Friction Stir Welding Root Strain and Stress

作　　者：田志杰 刘力源 马核 颜旭 孙宇明 Tian Zhi-jie;Liu Li-yuan;Ma He;Yan Xu;Sun Yu-ming(Capital Aerospace Machinery Corporation Limited,Beijing,100076;Beijing Institute of Astronautical Systems Engineering,Beijing,100076;Beihang University,Beijing,100191)

机构地区：[1]首都航天机械有限公司,北京100076 [2]北京宇航系统工程研究所,北京100076 [3]北京航空航天大学,北京100191

出　　处：《导弹与航天运载技术》2022年第1期105-109,共5页Missiles and Space Vehicles

摘　　要：为了研究搅拌摩擦焊缝搅拌针尖端位置的行为,采用5.7 mm与6 mm长搅拌针对6.2 mm厚2A14铝合金板材进行搅拌摩擦焊试验。当焊缝根部搅拌不充分时,接头强度衰减的同时焊根处也出现了未焊合缺陷。为进一步研究焊根位置的热力行为,采用CEL方法对搅拌摩擦焊进行数值模拟分析,通过模拟得到了焊根位置的等效塑性应变场与等效应力场。综合焊根位置金相试验结果与数值模拟结果,分析了搅拌摩擦焊缝根部的机制,为搅拌摩擦焊工艺控制提供了重要参考。In order to study the behavior of pin tip in friction stir welding(FSW),the FSW test is carried out on 2A14 aluminum alloy sheet of 6.2mm thickness with the pin length of 5.7mm and 6mm.When the weld root is stirred deficiently,both the attenuated of joint and root flaw is appeared.Therefore,in order to study the thermal and flow behavior of the root materials,numerical simulation with CEL method was adopted to simulate FSW,and the equivalent plastic strain and equivalent stress field of the root are obtained by simulation,and the mechanism of the FSW root is analyzed by the metallographic test and numerical simulation research.Base on the above,an important reference of FSW process control is provided.

关 键 词：搅拌摩擦焊 应力 数值模拟 焊根 

分 类 号：TG456.9[金属学及工艺—焊接]