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장윤주(Yun Ju Jang),김흥규(Heung Kyu Kim),김형종(Hyung Jong Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
This study aims to investigate quantitatively the springback characteristics of the several steel sheets including high-strength steel (HSS) sheets through experiment and finite element analysis (FEA). Some of the materials used are coated and the others not. The geometric springback parameters in the U-draw bending test, one of the NUMISHEET '93 benchmark problems, are measured or calculated for various levels of the blank-holding force.
장욱경,장윤주,김형종 江原大學校 産業技術硏究所 2010 産業技術硏究 Vol.30 No.A
A forming limit diagram (FLD) defines the extent to which specific sheet material can be deformed by drawing, stretching or any combination of those two. To determine the forming limit curve (FLC) accurately, it is necessary to perform the tests under well-organized conditions. In this study, the influence of several geometric or process parameters such as the blank shape and dimensions, strain measuring equipments, test termination time, forming speed and lubricants on the FLC is investigated.