저자명 M.K. Choi, H. Huh, and N. Park 
Journal Journal of Materials Processing Technology 
Volume 244 
Number  
Pages 331-343 
year 2017 
This paper introduces combined deep drawing and electromagnetic sharp edge forming to improve the formability of advanced high strength steels. It includes a feasibility study of combined deep drawing and electromagnetic sharp edge forming of DP980 steel sheet with a thickness of 1.2 mm. A feasible approach of the combined forming process is investigated with numerical analysis which consists of pre-forming and electromagnetic sharp edge forming using the pre-formed sheet. Pre-forming analyses are conducted to check the formability of the material by utilizing a fracture forming limit diagram developed. Then electromagnetic forming is applied to the pre-formed workpiece to obtain a sharp edge that fails to format the conventional pre-forming. In electromagnetic sharp edge forming, process parameters related to the forming force are optimized so that the desired shape is formed as close as possible. The optimization of the forming force is carried out satisfying the objective function and constraint functions established to minimize the deviation of a deformed shape from the desired shape without exceeding the forming limits. In order to induce the optimized forming force, the electromagnetic tool coil is designed with topology optimization. A new electromagnetic topology optimization formulation is developed for the design of an efficient tool coil. Numerical results and conclusions demonstrate the applicability of this combined forming process.
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123 Evaluation of the effect of the strain rate on the tensile properties of carbon–epoxy composite laminates file J. Kwon, J. Choi, H. ...  2017.06.07 95
122 Material properties of the nugget zone in resistance spot-welded DP980 steel joint at various strain rates file N. Park, M. Park, J.B...  2017.06.07 105
121 Fracture-based Forming Limit Criteria for Anisotropic Materials in Sheet Metal Forming file N. Park, H. Huh, S.J....  2017.06.07 88
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118 Tensile Properties of Sheet Metals at Intermediate Strain Rates with Pre-Strain file S. B. Kim and H. Huh  2015.11.18 1180
117 Anisotropy Effect on the Fracture Model of DP980 Sheets Considering the Loading Path file N. PARK, H. HUH, J. B...  2015.06.15 1682
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