Dynamic Constitutive Relationship Of TC4 Titanium Alloy

The aero-engine casing containment is important for aero-engines to improve safety and reliability. It is necessary to investigate dynamic constructive of casing-material during process of blades containment.Dynamic mechanical behaviors of TC4 titanium is studied over the strain rate range from 10^-3s^-1to 4×10^-3s^-1with a split Hopkinson tension bar system and a static material test system. The result indicates that yield stress and flow stress are increased with the enhancement of strain rate. The dynamic yield stress and flow stress are much larger than the static. Johnson-Cook constitutive model and Cowper-Symonds constitutive mode are evaluated for their ability to model deformation behavior of TC4 alloy, and Cowper-Symonds constitutive model correlates TC4 data best. Numerical simulation method for Hopkinson tension test to TC4 based on LS-DYNA codes and Cowper-Symonds constitutive mode. The contrast between numerical simulation and experimental data obtained by Hopkinson tension test demonstrates that the Cowper-Symonds constitutive model can describe the mechanical behavior of TC4 alloy under impact loading.