Dynamic mechanical properties of β phase titanium alloy under high temperature and high strain rate

Abstract Titanium alloy is vital for the propulsion system of remote-sensing spacecraft. Facing the increasing threat of space debris, exploring the dynamical properties of the new titanium materials is one of the essential technologies for spacecraft space protection. This paper presents the results of an investigation into the dynamic mechanical properties of a novel Ti-5553 β phase titanium alloy. The alloy was subjected to testing at temperatures of 25°C, 200°C, 400°C, and 600°C, and strain rates of 2000 s −1 and 4000 s −1 , using two distinct experimental techniques: the split Hopkinson pressure bar (SHPB) and the Gleeble. A three-dimensional model of the SHPB experiment is established under the same conditions as the test. The findings indicate that the flow stress of the Ti-5553 β-phase titanium alloy exhibits a decline with an increase in temperature under high-temperature and high-strain-rate loading conditions. The Johnson-Cook material model of Ti-5553 titanium alloy was developed through the optimization of material parameters and subsequently applied to a three-dimensional digital simulation model. This model is capable of accurately reflecting the material’s dynamic compressive mechanical properties across a temperature range of 25 to 600°C and a strain rate range of 2000 ~ 4000 s −1 . The dynamic mechanical parameters of the new Ti-5553 titanium alloy obtained in this paper can provide data support for the design of spacecraft space protection structures.