Comparison of two CDM-based models for necking and fracture limits of metal sheets under hot stamping conditions
File(s)
Author(s)
Zhang, R
Lin, J
Type
Conference Paper
Abstract
A unified viscoplastic constitutive model based on continuum damage mechanics (CDM) has been recently developed for the prediction of forming limit curves (FLCs) and fracture forming limit curves (FFLCs). In this CDM model, two damage variables which are strain path dependent (so called strain-based model) have been introduced to model the necking and fracture limits in sheet metal forming. In this study, the two damage variables have been modified by replacing the strain components with stress components to model stress path dependence (so called stress-based model). Then the two sets of CDM models have been analysed and compared in respect to their computational accuracy and efficiency. For this purpose, all the material constants in the models have been calibrated using the recently published data of 22MnB5 boron steel sheet under hot stamping conditions. Subsequently, the two models together with the calibrated material constants have been implemented into the commercial software ABAQUS using a user subroutine VUMAT, and applied to biaxial tests for the computation of both the necking and the fracture limit strains at hot stamping temperatures. Computational results show that there is little difference between the two CDM models with respect to the computed limit strain values, but the strain-based CDM model is more time-efficient.
Editor(s)
Huang, Q
Zhao, G
Liu, G
Jin, H
Date Issued
2022-12-19
Date Acceptance
2022-11-10
Citation
IOP Conference Series: Materials Science and Engineering, 2022, 1270, pp.1-7
ISSN
1757-8981
Publisher
IOP Publishing
Start Page
1
End Page
7
Journal / Book Title
IOP Conference Series: Materials Science and Engineering
Volume
1270
Issue
1
Copyright Statement
© 2022 The Author(s). Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd
License URL
Identifier
10.1088/1757-899X/1270/1/012115
Source
19th International Conference on Metal Forming (MF 2022)
Subjects
constitutive model
damage mechanics
Electrochemistry
Engineering
Engineering, Manufacturing
forming limit curve (flc)
fracture forming limit curve (fflc)
hot stamping
Materials Science
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Physical Sciences
Science & Technology
Technology
Publication Status
Published
Start Date
2022-09-11
Finish Date
2022-09-14
Coverage Spatial
online
Date Publish Online
2022-12-19