Sheet metal forming limit prediction based on plastic deformation energy |
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| Authors: | Jieshi Chen Xianbin Zhou Jun Chen |
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| Affiliation: | 1. National Engineering Research Center of Die & Mold CAD, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, China;2. Sheet Metal Forming Research Center, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;1. Department of Mechanical Engineering, University of Isfahan, Isfahan 81746-73441, Iran;2. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 8415683111, Iran;1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, People?s Republic of China;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;1. School of Mechanical, Aerospace and Systems Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;2. Institute for Forming Technology and Lightweight Construction (IUL), TU Dortmund University, Baroper Str. 303, Dortmund 44227, Germany;3. POSCO Global R&D Center, 180-1, Songdo-dong, Yeonsu-gu, Incheon 406-840, Republic of Korea;1. Tianjin Key Laboratory of Equipment Design and Manufacturing Technology, Tianjin University, Tianjin 300072, China;2. General Motors Global Research and Development Center, Warren, MI 48090, USA;3. Department of Mechanical Engineering, University of Hawai‘i at Mānoa, Honolulu, HI 96822, USA |
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| Abstract: | For sheet metals, the endurance to fracture under different strain paths may be different. Based on plastic deformation energy, the sheet metal forming limit is calculated, and the relationship model between maximum allowable integral value of the general plastic work criterion and the strain path is built. In addition, the strain-hardening exponent, anisotropy coefficient and the initial thickness of the material are also taken into account to consider their effects on forming limit. In order to simplify the process of parameter determination, only uniaxial tension test is used to calculate the material property parameters and necessary limit strain, and the expression of the criterion is determined finally. Then the limit strains under other strain paths between uniaxial tension to equi-biaxial tension are predicted by the criterion combined with numerical simulation of the forming process. The criterion is also applied to limit strain prediction under bilinear strain path. |
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