Dynamic behavior and constitutive modeling of Ti-10-2-3 alloy

Abstract

To investigate the dynamic mechanical behavior of Ti-10-2-3 alloy, the material was subjected to quasi static and dynamic compression testing. The results confirm that material exhibits strain rate sensitivity at low and high strain rates. The deformation mechanisms are elucidated by thermal activation theory. Voyiadjis-Abed (V-A) model is proposed to establish the thermo mechanical response of Ti-10-2-3 alloy. The developed model is compared with Johnson-Cook (J-C) model at different strain rates and temperatures. The V-A model well established the quasi-static and dynamic behavior of the Ti-10-2-3 alloy, mainly the effects of strain hardening and thermal softening. This model is embedded in ABAQUS/Explicit code in the form of a VUMAT user-subroutine to perform ballistic impact simulations. It is found that the predicted residual velocities are well matching with the experimental results. Adiabatic shear bands were observed in specimens deformed at higher strain rates. The tensile specimen is broken in a manner of ductile fracture presenting typical dimple structure, while the compressive specimen fails in a manner of localized shearing failure.