Elastic Modulus Model Based on Dislocation Density and its Application on Aluminum Alloy 5052
An elastic modulus model is proposed to describe the phenomenon of the material’s elastic modulus varying with plastic strain. This elastic modulus model is theoretically interpreted using the dislocation density as an internal variant. Loading-unloading-reloading (LUR) tensile tests have been implemented to analyze the non-linear unloading behavior. The maximum decrease of the elastic modulus of AA5052 is approximately 16%. The proposed model is introduced into the springback simulation of U-bending. The results showed that the contour of springback simulation with the proposed elastic modulus model is closer to that of the experimental data than results of constant elastic modulus simulation. Error in the springback simulation with the proposed elastic modulus model can be reduced by up to 20% compared with that predicted with a constant elastic modulus.
Fusahito Yoshida and Hiroshi Hamasaki
H. Y. Yu and C. X. Zhou, "Elastic Modulus Model Based on Dislocation Density and its Application on Aluminum Alloy 5052", Key Engineering Materials, Vol. 725, pp. 659-664, 2017