Deakin University
Browse

File(s) under permanent embargo

Prediction of fracture initiation in square cup drawing of DP980 using an anisotropic ductile fracture criterion

conference contribution
posted on 2017-09-27, 00:00 authored by N Park, H Huh, Jeong YoonJeong Yoon
This paper deals with the prediction of fracture initiation in square cup drawing of DP980 steel sheet with the thickness of 1.2 mm. In an attempt to consider the influence of material anisotropy on the fracture initiation, an uncoupled anisotropic ductile fracture criterion is developed based on the Lou - Huh ductile fracture criterion. Tensile tests are carried out at different loading directions of 0°, 45°, and 90° to the rolling direction of the sheet using various specimen geometries including pure shear, dog-bone, and flat grooved specimens so as to calibrate the parameters of the proposed fracture criterion. Equivalent plastic strain distribution on the specimen surface is computed using Digital Image Correlation (DIC) method until surface crack initiates. The proposed fracture criterion is implemented into the commercial finite element code ABAQUS/Explicit by developing the Vectorized User-defined MATerial (VUMAT) subroutine which features the non-associated flow rule. Simulation results of the square cup drawing test clearly show that the proposed fracture criterion is capable of predicting the fracture initiation with sufficient accuracy considering the material anisotropy.

History

Event

International Deep Drawing Research Group. Conference (36th : 2017 : Munich, Germany)

Volume

896

Series

Journal of physics: conference series v.896

Pagination

1 - 8

Publisher

IOP Publishing

Location

Munich, Germany

Start date

2017-07-02

End date

2017-07-06

ISSN

1742-6588

eISSN

1742-6596

Language

eng

Publication classification

E Conference publication; E1 Full written paper - refereed

Copyright notice

2017, IOP Publishing

Editor/Contributor(s)

Unknown

Title of proceedings

IDDRG 2017: Materials Modelling and Testing for Sheet Metal Forming : Proceedings of the International Deep Drawing Research Group