Deakin University
Browse
zhang-newstrain-2018.pdf (977.86 kB)

A new strain-based method to determine GTN parameters for thin stainless steel foil

Download (977.86 kB)
conference contribution
posted on 2018-08-06, 00:00 authored by Peng Zhang, Michael PereiraMichael Pereira, Bernard RolfeBernard Rolfe, Daniel Wilkosz, Buddhika Abeyrathna, Matthias WeissMatthias Weiss
In this work, tensile tests were carried out on the 316L foil with a thickness of 0.1mm to calibrate the Gurson–Tvergaard–Needleman (GTN) model. Two calibration methods were compared for calibrating the same test data. The common approach is to use iterative finite element simulations to fit the experimental load-displacement curve. A new strain-based approach, which uses strain data obtained by a Digital Image Correlation (DIC) system, is presented here. It uses a stress-return-mapping algorithm to reconstruct the fracture related state variable, i.e., the accumulated void volume fraction. Fracture is predicted when the critical void fraction is reached at the measured fracture moment. The study shows that the new approach gives similar fracture model parameters compared to the common method, but with significantly higher computational efficiency.

History

Event

Numerical Simulation of 3D Sheet Metal Forming Processes. Conference and Workshop (11th : 2018 : Tokyo, Japan)

Volume

1063

Issue

1

Pagination

1 - 6

Publisher

IOP Publishing

Location

Tokyo, Japan

Place of publication

Bristol, Eng

Start date

2018-07-30

End date

2018-08-03

ISSN

1742-6588

eISSN

1742-6596

Language

eng

Publication classification

E Conference publication; E1 Full written paper - refereed

Title of proceedings

NUMISHEET 2018: Proceedings of the 11th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes