Prediction of Forming Limit of Sheet Metal Based on Stören-Rice Model
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.
Chuansheng Wang, Lianxiang Ma and Weiming Yang
W. G. Guo et al., "Prediction of Forming Limit of Sheet Metal Based on Stören-Rice Model", Advanced Materials Research, Vol. 221, pp. 205-210, 2011