ARTICLE
Study on ductile fracture criterion applied to shear fracture prediction of DP780 sheet
1
China North Vehicle Research Institute, Beijing, China
2
China North Artificial Intelligence and Innovation Research Institute, Beijing, China
Submission date: 2023-07-02
Final revision date: 2023-11-09
Acceptance date: 2023-11-15
Online publication date: 2024-01-26
Publication date: 2024-01-31
Corresponding author
Jiaxiong Wu
General Technology Department, NORINCO GROUP China North Vehicle Research Institute, China
General Technology Department, NORINCO GROUP China North Vehicle Research Institute, China
Journal of Theoretical and Applied Mechanics 2024;62(1):143-156
KEYWORDS
TOPICS
ABSTRACT
With the development of automotive lightweight technology, the improvement of the design
of body sheet metal forming processes has gradually become a research focus. Advanced high-
-strength dual-phase steel is the main material for lightweight vehicle bodies, and exploring
its accurate ductile fracture criteria plays an important role in predicting the forming fracture
behavior of the sheet metal. The characterizations of the plastic behavior of the DP780 sheet
before fracture were performed by the Swift hardening model. Three sets of tests from pure
shear to tensile-shear stress states are designed to calibrate the ductile fracture parameters of
Lou-Huh, Cockcroft-Latham, and Rice-Tracey criteria. The calibrated parameters are used
to predict tensile shear test fractures and punching fractures at small bend fillets of molds.
The results show the Lou-Huh criterion can accurately predict the shear fracture behavior
of the DP780 sheet in the low-stress triaxiality (0.08-0.33).
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| eISSN: | 2543-6309 |
| ISSN: | 1429-2955 |
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