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Anisotropic fracture forming limit diagram considering non-directionality of the equi-biaxial fracture strain

journal contribution
posted on 2018-10-15, 00:00 authored by Namsu Park, H Huh, Jeong YoonJeong Yoon
This paper is concerned with modeling of anisotropic fracture forming limit diagram considering non. -directionality of the equi. -biaxial fracture strain. A new anisotropic ductile fracture criterion is developed based on the Lou-Huh ductile fracture criterion (Lou et al., 2012). In an attempt to predict the forming severity of advanced high. -strength steel (AHSS) sheets, the proposed fracture criterion is converted into a Fracture Forming Limit Diagram (FFLD) and anisotropic fracture locus considering the sheet metal orientation. Tensile tests of the DP980 steel sheet with the thickness of 1.2 mm are conducted using various specimen geometries including pure shear, dog. -bone, and flat grooved specimens. With Digital Image Correlation (DIC) method, equivalent plastic strain distribution on the specimen surface is computed until surface crack initiates. The fracture predictability of the proposed fracture criterion is evaluated with the experimental results which cover a wide range of stress states in various loading directions. By comparing fracture strains obtained from the experiments with the ones predicted from the proposed fracture criterion, it is clearly confirmed that the fracture criterion proposed is capable of predicting the equivalent plastic strain at the onset of fracture with great accuracy over a wide range of stress states while keeping non-directionality of the equi. -biaxial fracture strain.

History

Journal

International journal of solids and structures

Volume

151

Pagination

181-194

Location

Amsterdam, The Netherlands

Open access

  • Yes

ISSN

0020-7683

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, Elsevier

Publisher

Elsevier

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