STUDY ON DUCTILE FRACTURE CRITERION APPLIED TO SHEAR FRACTURE PREDICTION OF DP780 SHEET

被引：0
作者：
Wu, Jiaxiong [1 ]
Sun, Xuguang [1 ]
Sun, Xiaoce [1 ]
Chang, Fu [1 ]
Yang, Shudi [2 ]
Tan, Senqi [2 ]
机构：
[1] China North Vehicle Res Inst, Beijing, Peoples R China
[2] China North Artificial Intelligence & Innovat Res, Beijing, Peoples R China
来源：
JOURNAL OF THEORETICAL AND APPLIED MECHANICS | 2024年 / 62卷 / 01期
基金：
中国国家自然科学基金;
关键词：
ductile fracture criterion; DP780; fracture prediction; shear fracture; sheet forming;
D O I：
10.15632/jtam-pl/176309
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
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).
引用
收藏
页码：143 / 156
页数：14
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