Analysis of Forming Limit of Sheet Metals Considering Vertex Localized Necking and Ductile Damage Criterion

Document Type : Research Article

Authors

1 Mechanical Faculty, University Campus 2, University of Guilan, Rasht, Iran

2 Mechanical Faculty, University of Guilan, Rasht, Iran

3 Mechanical Engineering Department, Imam Khomeini International University

Abstract

In the present paper, a predictive strain-rate-dependent model of localized necking is developed by using a modified Vertex theory. A novel ductile damage-based criterion is proposed to control the necking parameters including on stress triaxiality, strain hardening exponent, and Lode parameters. As a characterization parameter, elastic modulus is eventually chosen to measure the ductile damage during the process of plastic deforming. Furthermore, a vectorized user-defined material subroutine is developed to finite element simulation by ABAQUS software, according to original formulations, to create a linkage between related essential models. A typical strain rate-dependent metal is selected to validate the modified Vertex theory. To examine the accuracy of the results from the present simulated study, the applicability is considered to compare with the experimental results. Tests of forming are also performed for steel 13 and steel 14 sheets to measure forming limit diagram. It should be noted that the simulated forming limit diagrams are in good agreement with the experimental data. However, this correlation at low strain rates is better than high strain rates. However, this increase will be infinitesimal for the lower strain rates as compared to the higher ones.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 2 (Special Issue)
May 2021
Pages 1307-1320

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