Experimental and numerical analysis of high strain rate response of Ti-6Al-4V titanium alloy

Abstract
In the present work the combined experimental and theoretical approach has been applied to study high strain rate behavior and failure of titanium alloy Ti-6Al-4V. For modeling constitutive material response it has been suggested to use the modified Gurson's plasticity model which takes into account a dependence on the type of loading. Rate dependency effects have been added to the initial constitutive equations. Compressive and tensile tests were carried out by means of Split Hopkinson Pressure Bar for determination of dynamic stress-strain curves, strain rate histories, plasticity and failure properties for strain rate range 10²–10⁴ s⁻¹. Parameters of the material model were determined using the obtained experimental results. High strain rate tensile tests of cylindrical V-cut specimens and three point bending (Charpy) experiments were carried out for validation of the model. The numerical simulation of dynamic material response was conducted with implementation of the developed material model for the last test schemes.