大尺寸6056铝合金薄板经过搅拌摩擦焊接实验后出现了严重的面外变形,虽然变形程度小于熔化焊结果, 但已经影响到被焊薄 板的装配和使用.为详细研究和预测铝合金薄板在搅拌摩擦焊后的残余变形, 以焊接实验条件为基础, 建立了搅拌摩擦焊接三维有限元 热力耦合分析模型. 模型中涉及了利用搅拌头工作转矩计算热输入量、工件和卡具之间的接触热传导、随温度变化的材料模型, 以及综合 考虑搅拌头机械作用等工作.利用该模型可以得到不对称的纵向残余应力结果, 残余变形的趋势在整块板上都与实验结果相同, 而且变形量和实验测量值之间的误差在20%以内.
Although the residual distortion of 6056 Al alloy sheet after friction stir welding (FSW) is smaller than that after fusion welding, it is still a significant defect for the assembly and application of welded structure. In order to investigate and predict the residual distortion of Al alloy sheet after FSW, a 3D thermo–mechanical model was established based on experimental conditions to simulate the FSW process. In the model, heat input was computed based on the torque data measured during experiment, and heat transfer between welded sheet and fixtures was simplified in the way of convection, and the properties of 6056 Al alloy were considered as temperature function, and tool loads were taken into account during the mechanical analysis. The simulation results show that the distribution of longitudinal residual stress along the width of sheet is asymmetrical, and the residual distortion corresponds well with experimental results both in distortion pattern and deformation values on the whole sheet.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%