|
چکیده
|
Strain rate is an effective parameter in characterization of ductile materials. In this work, the influence of strain rate on damage evolution in copper is investigated through analytical approach, experiment, and numerical simulation. In the analytical approach, a modified damage model is proposed to take account of the effect of strain rate on damage parameter based on Continuum Damage Mechanics (CDM). A new technique is used for evaluation of damage evolution in tensile dog bone specimens using a Split Hopkinson Tensile Bar (SHTB). The results of high strain rate tests are used to validate the modified damage model. The proposed model is based on Bonora ductile damage model in which the effect of strain rate is incorporated. The numerical simulations are performed by implementing the proposed model in the finite element commercial code, ABAQUS/Explicit using VUSDFLD subroutines. A reasonable agreement was observed between the experimental data and the proposed damage model.
|