| 摘要: |
| 根据搅拌摩擦连接特点,充分考虑搅拌摩擦连接过程中搅拌针各部位与连接板材之间的摩擦生热及在连接过程中连接板材摩擦系数随温度变化规律,建立了适合搅拌摩擦连接自身特点的动态热元模型,并利用此模型进行了航空铝合金板材搅拌摩擦连接过程的有限元分析模拟.通过模拟结果和试验结果对比验证了所建立的动态热源模型和有限元分析过程是合理的.模拟结果显示搅拌摩擦连接残余拉应力主要集中在连接区,且在连接区中间位置出现最大残余拉应力区,连接区两端及其它部位出现残余压应力. |
| 关键词: 搅拌摩擦连接 残余应力 航空铝合金 热源模型 有限元分析 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51305199,51175255);安徽省高校优秀青年人才基金重点资助项目(2013SQRL089ZD);江苏省博士后基金资助项目(1201007C);黄山学院人才启动基金资助项目(2012xkjq003) |
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| Finite element analysis on friction stir welding of aviation aluminum alloy plate |
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WANG Hongfeng1,2, WANG Jianli1, ZUO Dunwen2, SONG Weiwei1, DUAN Xinglin1,2
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1.School of Mechanical Electronic & Information Engineering, Huangshan University, Huangshan 245041, China;2.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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| Abstract: |
| According to characteristics of friction stir welding,the dynamic heat source model for characteristics of friction stir welding process has been established based on fully considering the friction generating heat between the each parts of the tool and the joining plate,and joining plate friction coefficient with the temperature changing law in the friction stir welding process. By which finite element simulation has been studied for friction stir welding of aviation aluminum alloy sheet. By comparison with simulation results and test results,it could be verified that the established dynamic heat source model and finite element analysis process are reasonable. The simulation results show that the friction stir welding residual tensile stress is concentrated in the joint region,the maximum residual tensile stress appears in the middle of the joint region,and the residual compressive stress appears at the both ends in the joint region and other areas. |
| Key words: friction stir welding residual stress aviation aluminum alloy heat source model FEM |
