Evaluation of effect of flow stress characteristics of tubular material on forming limit in tube hydroforming process |
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| Authors: | Woo-Jin Song Seong-Chan Heo Tae-Wan Ku Jeong Kim Beom-Soo Kang |
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| Affiliation: | 1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China;2. Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China;3. Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;4. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China;5. Department of Precision manufacturing engineering, Suzhou Vocational Institute of Industrial Technology, Suzhou 215104, PR China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;3. Department of Mechanical Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | The material properties for the analytical and numerical simulation in sheet metal processes, especially in tube hydroforming process, are generally obtained from the uniaxial tensile test of raw sheet material. However, the validation of the formability and reliability of the numerical simulation for the tube hydroforming process arises from the fact that the material characteristics of tubes are different from those of the raw sheet materials. In order to determine the most suitable material property of the tubular material for the evaluation of forming limit on the THF process, the uniaxial tensile test for the specimens of the raw sheet metal and the roll-formed tube and the free bulge test for the roll-formed tubular material are carried out in this paper. The forming limit curves are also derived using plastic instability based on three kinds of necking criteria, which are Hill’s local necking criterion for sheet and Swift’s diffuse necking criteria for sheet and tube, to describe and explain the forming limits for the roll-formed tubular material in the THF process. In order to acquire the informative data on the forming limit curves in the THF process, the loading condition of the free bulge test is controlled. The proper band from nearly necking initiation to nearly bursting initiation has been defined for the roll-formed tubular material in the THF process. It can be concluded that the flow stress of the tubular material should be determined from the actual free bulge test to find the practically valuable forming limit curve for the THF process. |
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