应变模型对薄板面外变形的影响
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摘要
在焊接数值模拟过程中,是否考虑几何非线性对计算结果有较大的影响。基于Ansys有限元软件,以5mm厚的Q550低碳钢薄板MAG对接接头为例,采用热弹塑性有限元法考虑材料的非线性及几何非线性的影响,模拟分析焊接过程中的焊接变形。同时,采用试验的方法测量焊接接头的面外变形。结果表明:考虑几何非线性的数值计算结果与实验测试结果十分吻合,验证了模型的正确性。
In the process of welding numerical simulation, whether the geometrical nonlinearity is considered has a great influence on the calculation result. Based on the finite element software Ansys, taking 5 mm thick Q550 low carbon steel sheet MAG butt joint as an example, the effect of material nonlinearity and geometric nonlinearity was considered by thermo-elastic-plastic finite element method, and the welding deformation during welding process was simulated and analyzed. Meanwhile, the actual out-of-plane deformation was measured by test method. The results show that the numerical calculation result of geometrical nonlinearity is very consistent with the test result, and the correctness of the model is verified.
In the process of welding numerical simulation, whether the geometrical nonlinearity is considered has a great influence on the calculation result. Based on the finite element software Ansys, taking 5 mm thick Q550 low carbon steel sheet MAG butt joint as an example, the effect of material nonlinearity and geometric nonlinearity was considered by thermo-elastic-plastic finite element method, and the welding deformation during welding process was simulated and analyzed. Meanwhile, the actual out-of-plane deformation was measured by test method. The results show that the numerical calculation result of geometrical nonlinearity is very consistent with the test result, and the correctness of the model is verified.
引文
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[2]方洪渊.焊接结构[M].北京:机械工业出版社,2011.
[3]Masubuchi K.Buckling type deformation of thin plate due towelding[C]//Proceedings of the 3rd Japan National Congress for Applied Mechanics.Japan:107-111.
[4]Yang Y P,Dong P.Buckling Distortions and Mitigation Techniques for Thin-Section Structures[J].Journal of Materials Engineering and Performance,2012,21(2):153-160.
[5]张建强,张国栋,赵海燕,等.铝合金薄板焊接应力三维有限元模拟[J].焊接学报,2007,28(6):5-9.
[6]Watanabe M,Satoh K.On the type of distortion in various welded joints:shrinkage distortion in welded joint(report 5)[J].Journal of Japan Welding Society,1957,26(6):399-405.
[7]周一俊,邓德安,冯可,等.低碳钢薄板单道堆焊焊接变形的数值模拟[J].焊接学报,2013,34(12):101-104.
[8]Deng Dean,Zhou Yijun,Bi Tao,et al.Experimental and numerical investigations of welding distortion induced by CO2gas arc welding in thin-plate bead-on joints[J].Materials&Design,2013,52:720-729.
[9]Deng D.Theoretical prediction of welding distortion in thin curved structure during assembly considering gap and misalignment[D].Osaka:Osaka University,2002.