Prediction of Forming Limit of Sheet Metal Based on Stören-Rice Model

Wei Gang Guo; Jia Ming Chen; Hui Min Li; Li Dong Shao

doi:10.4028/www.scientific.net/AMR.221.205

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Prediction of Forming Limit of Sheet Metal Based on Stören-Rice Model

Abstract:

On the basis of Storen-Rice model, the limit strain formula is derived by introducing the plasticity constitutive relation coupling Logan-Hosford yield function. Limit strain of AL6111-T4 and AL2028 is calculated and compared with experimental data. The effect of index a of yield function, anisotropy parameter r on the calculation result is discussed. Index a has a significant effect on the right hand side(RHS) limit strain, while it has less relation with left hand side(LHS) limit strain. The RHS limit strain is smaller while a-value gets larger. Good correlation between the calculation result and experimental data is indicated when a-value equals to 4. The RHS limit strain is smaller while r gets larger when a equals to 2, while it has less relation with r when a equals to 4 or 6.