Experimental Study on Mechanical Properties and Failure Characteristic of Commercially Pure Titanium under Dynamic Compression

Dynamic compression and adiabatic shear failure experiments were carried out for commercially pure titanium TA2 by split Hopkinson pressure bar (SHPB). Macro stress-strain curves were obtained at different strain rates and temperatures. The compressive constitutive characteristics and micro failure were comparatively analyzed and the effects of strain rate and apparent compressive constitutive characteristics on adiabatic shear band (ASB) formation were discussed. Results show that the dynamic compression of TA2 exhibits an adiabatic shear failure characteristic, and the ASBs are of symmetrical bipyramid shape. With the strain rate increasing, the critical strain of ASB formation becomes lower. It is found that the constitutive softening information of the origination and development of ASBs cannot be acquired by dynamic compression tests.