Geometric size effect of Lemaitre damage model parameters of rolled CuAl5 alloy
(School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)
Abstract: The geometric size effects (GSEs) of Lemaitre damage model parameters (the critical damage value at rupture, Dc, the strain at the damage threshold, εD, and the strain at rupture, εR) of a rolled CuAl5 alloy were evaluated using uniaxial tensile experiments and the finite element method. The results indicated the presence of size effect on the damage model parameters of the rolled CuAl5 alloy. With an increase in reduction ratio (Rr) at a constant thickness (t), Dc increased; with an increase in t at a constant Rr, Dc decreased and then increased. Both εD and εR decreased with increasing Rr and decreasing t. New models of the relationship between the damage model parameters and t were established for the three Rr values. The predicted results of the models agreed with the experimental ones. These results help to accurately predict the fracture behavior of microparts during plastic forming.
Key words: Lemaitre damage model; geometry size effect; CuAl5 alloy; reduction ratio; cold rolling