Fracture modelling of DP780 sheets using a hybrid experimental-numerical method and two-dimensional digital image correlation

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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.
Publisher
INDERSCIENCE ENTERPRISES LTD
Issue Date
2014
Language
English
Article Type
Article
Keywords

DUCTILE FRACTURE; PREDICTION; WORKABILITY; METALS

Citation

INTERNATIONAL JOURNAL OF MATERIALS & PRODUCT TECHNOLOGY, v.48, no.1-4, pp.34 - 46

ISSN
0268-1900
DOI
10.1504/IJMPT.2014.059029
URI
http://hdl.handle.net/10203/189242
Appears in Collection
ME-Journal Papers(저널논문)
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