Fracture modelling of DP780 sheets using a hybrid experimental-numerical method and two-dimensional digital image correlation
by Keunhwan Pack; Kwanghyun Ahn; Hoon Huh; Yanshan Lou
International Journal of Materials and Product Technology (IJMPT), Vol. 48, No. 1/2/3/4, 2014

Abstract: This paper is concerned with the construction of fracture envelopes of DP780 sheets using two methods: a hybrid experimental-numerical method; two-dimensional digital image correlation (2D-DIC). For the hybrid method, four types of ductile fracture tests were carried out covering a wide range of stress states on specimens: with a central hole; two symmetric circular notches; flat grooved; and diagonally double-notched. Based on the fracture strain and loading paths identified with finite element simulation, a fracture envelope was obtained by employing the three-parameter modified Mohr-Coulomb fracture model. In addition, the fracture surface strain was directly measured using 2D-DIC. Loading histories of each test were extracted from a surface element of a three dimensional finite element model. The comparison of fracture envelopes constructed by the two methods reveals that there is little difference. Thus, it can be concluded that 2D-DIC is applicable to fracture modelling of DP780 sheets despite the assumption of the plane stress condition even after necking.

Online publication date: Fri, 30-May-2014

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