Spring-Back Evaluation of Stretch Bending Process Based on Chaboche Combined Isotropic-Kinematic Hardening Laws

Abstract:

We present a study on spring-back prediction in the stretching bending process using the Chaboche model combined isotropic-kinematic hardening law and Mises yielding criterion, and a material user subroutine (VUMAT, UMAT) program was developed base on the ABAQUS interface for the model. The effects of different hardening law on the spring-back in the stretch forming process was also analyzed and compared. The simulation results show that the combined isotropic-kinematic hardening law has the better spring-back prediction compared with the pure isotropic and kinematic hardening law in the stretch forming process, which is verified by the experimental results.

• Periodical: Advanced Materials Research (Volumes 204-210)
• Pages: 1745-1750
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.204-210.1745
• Online since: February 2011
• Authors: Jing Hu, Xiao Xing Li, Kwan Soo Chung, Rao Yao
• Keywords: ABAQUS, Hardening Law, Springback, Stretch Bending, User Subroutine

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[13] GB/T 3880-1997. Figures. Fig. 1. A schematic view of the progressive update of the new stress. Fig. 2. (a) A schematic view of the stretch bending process (unit: mm) (b) meshes in the die and the sheet (only a quarter of the whole was considered by symmetry, unit: mm). Fig. 3. The effects of material hardening rules on the tangential stress in the bottom and top surfaces. (a) bottom surface (b) top surface Fig. 4. Stretch bending process with the die profile optimize by GA: (a) process of stretch bending, (b) unloading and (c) final pieces. Fig. 5 The springback of different hardening law and the experiment result. Tables. Elastic Modulus (GPa) Poisson's Ratio Yield Strength (MPa) Ultimate tensile strength (MPa) 72. 65 0. 3 88. 3 194. 8 Table 1. Mechanical properties of the aluminum alloy 2A12-O.