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|저자명||N. Park and H. Huh|
|Name||2015 KSTP fall conference|
This paper is concerned with modeling of a ductile fracture model considering the anisotropy of sheet metal to predict the sudden fracture of advanced high strength steel (AHSS) sheets in complicated forming processes. The Lou−Huh ductile fracture criterion is modified using the Hill’s 48 anisotropic plastic potential instead of the von Mises isotropic plastic potential to take account of the influence of anisotropy on the equivalent plastic strain at the onset of fracture. Two dimensional digital image correlation (2D-DIC) method is utilized to measure the strain histories on the surface of three different types of specimens during deformation. For the derivation of an anisotropic ductile fracture model, principal stresses are expressed in terms of the stress triaxiality, the Lode parameter, and the equivalent stress based on the Hill’s 48 anisotropic plastic potential. It is quantitatively verified that the anisotropic ductile fracture suggested can predict the onset of the fracture over a wide range of loading paths based on the confirmation of damage accumulation, such that it can be utilized for complicated sheet metal forming processes to evaluate the forming limit of advanced high strength steel (AHSS) sheets.