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Incremental air-bending forming simulation of sheet metal based on anisotropic plasticity theory

ZEMIN FU1,* , DACHAO HU1, XUHUI LIU1

Affiliation

  1. School of Mechanical Engineering, Shanghai Institute of Technology, Shanghai, P.R. China

Abstract

Modeling of multiple-step incremental air-bending forming processes requires an accurate description of anisotropic material behavior. This paper describes the finite element (FE) simulation results obtained using Hill’s quadratic anisotropic yield function under the conditions of plane stress and plane strain, respectively. The single-step air-bending and semiellipse-shaped workpiece multiple-step air-bending tests were modeled for WELDOX700, WELDOX900 and OPTIM960 anisotropic sheets, using the improved Hill’s yield function embedded into ABAQUS. Then, the air-bending springback, thickness strain along the transverse direction and parts profiles were computed. The studies show that the results predicted with Hill’s yielding criterion under the plane strain condition are in much better agreement with experiment data than those predicted with Hill’s yielding criterion under the plane stress condition. It can be taken as a valuable mathematical tool used for multiple-step incremental air-bending forming simulation of anisotropic sheet metals..

Keywords

Air-bending, Sheet metal incremental forming, Anisotropic material constitutive model, Finite element simulation.

Citation

ZEMIN FU, DACHAO HU, XUHUI LIU, Incremental air-bending forming simulation of sheet metal based on anisotropic plasticity theory, Optoelectronics and Advanced Materials - Rapid Communications, 5, 12, December 2011, pp.1312-1319 (2011).

Submitted at: Oct. 25, 2011

Accepted at: Nov. 24, 2011