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| ESTABLISHMENT OF MOVING TEMPERATURE FUNCTION METHOD AND ITS APPLICATION ON WELDING DISTORTION PREDICTION OF CYLINDRICAL AND CONICAL ALUMINUM ALLOY STRUCTURES |
| SUN Yanjun1), LI Dengcheng2), ZHANG Zenglei1), YAN Dongyang3), SHI Qingyu1) |
1) Advanced Materials Processing Technology, Ministry of Education Key Laboratory, Department of Mechanical Engineering, Tsinghua University, Beijing 100084
2) China Academy of Launch Vehicle Technology, Capital Aerospace Machinery Corporation, Beijing 100076
3) Beijing Institute of Astronautical Systems Engineering, Beijing 100076 |
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Cite this article:
SUN Yanjun LI Dengcheng ZHANG Zenglei YAN Dongyang SHI Qingyu. ESTABLISHMENT OF MOVING TEMPERATURE FUNCTION METHOD AND ITS APPLICATION ON WELDING DISTORTION PREDICTION OF CYLINDRICAL AND CONICAL ALUMINUM ALLOY STRUCTURES. Acta Metall Sin, 2011, 47(11): 1403-1407.
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Abstract Long computational time for thermo-mechanical simulation of welding distortion and residual stresses hinders the application of this technique in large welded structure. It is of urgent need to develop a high efficiency numerical simulation strategy for welding process. The traveling temperature function method, in which the quasi--steady state character of welding process was exploited, was applied in the present study to improve the efficiency of welding simulation. Also the temperature and temperature history dependent material property models were established and applied. The finite elements analysis (FEA) models of 4 types of cylindrical and conical aluminum alloy structures, with different geometric shapes and dimensions, were built to analyze. Traditional moving heat source models were also established for these 4 structures to compare with the traveling temperature function method. The welding induced distortions were predicted by both methods for all the structures. The time cost of the traveling temperature function method is less than 40% of that of the traditional moving heat source method. While the computed distortion trends and values of two simulation methods were consistent. Finally the validation experiments were carried out and the distortions were measured. The measured distortions were compared with the numerical simulation results of two methods. The comparison show goods agreement. The errors between computed results from the two methods and the experimental results
are no more than 10% for all types of structures. This indicates that the numerical simulation models are not only
highly efficient, but also suitable for different types of cylindrical and conical aluminum alloy structures. So the traveling temperature function method is a high efficiency numerical simulation method with abroad applicability. This is a beneficial attempt and a novel idea to driving numerical simulation method in application of the large welded structures.
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Received: 20 May 2011
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| Fund: Supported by High Technology Research and Development Program of China (No.2006AA04Z139) |
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