Forming Limits Under Stretch-Bending Through Distortionless and Distortional Anisotropic Hardening

被引:13
|
作者
He, Ji [1 ]
Gu, Bin [1 ]
Li, Yongfeng [1 ]
Li, Shuhui [1 ]
机构
[1] Shanghai Jiao Tong Univ, Shanghai Key Lab Digital Mfg Thin Walled Struct, State Key Lab Mech Syst & Vibrat, Shanghai 200240, Peoples R China
基金
中国国家自然科学基金;
关键词
stretch-bending; forming limit curve (FLC); anisotropic hardening; sheet metals; NONLINEAR STRAIN PATHS; LOCALIZED NECKING; SHEET METALS; PLASTICITY; PREDICTION; FRACTURE; MODEL;
D O I
10.1115/1.4041329
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The necking behavior of sheet metals under stretch-bending process is a challenge for the forming limit prediction. State-of-the-art forming limit curves (FLCs) allow the prediction under the in-plane stretching but fall short in the case under out-of-plane loading condition. To account for the bending and straightening deformation when sheet metal enters a die cavity or slide along a radius, anisotropic hardening model is essential to reflect the nonproportional loading effect on stress evolution. This paper aims to revisit the M-K analysis under the stretch-bending condition and extend it to accommodate both distortionless and distortional anisotropic hardening behavior. Furthermore, hardening models are calibrated based on the same material response. Then the detailed comparison is proposed for providing better insight into the numerical prediction and necking behavior. Finally, the evolution of the yield surface and stress transition states is examined. It is found that the forming limit prediction under stretch-bending condition through the M-K analysis strongly depends on the employed anisotropic hardening model.
引用
收藏
页数:14
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