This paper aims to evaluate the impact resistance of Ti80 alloy under low-velocity impact loads using a numerical study of the dynamic response.

First, the finite element software Abaqus/Explicit is used to establish a finite element model of a Ti80 alloy plate under low-velocity impact load. Second, the rationality of the material parameters and reliability of the finite element model are verified through a comparison with the experimental results. Finally, the effects of the impactor shape, yield strength and fracture energy on the dynamic response of the Ti80 alloy plate under low-velocity impact load are discussed on the basis of the finite element model.

The numerical results agree well with the experimental results in their dynamic response and deformation/failure modes. Under low-velocity impact load, damage initializes on the backside of the Ti80 alloy plate due to excessive tensile deformation. The hole expansion effect of the conical impactor causes serious plugging damage to the Ti80 alloy plate. The peak impact force, peak displacement of the impactor and energy absorbtion exhibit an approximately linear relationship to the yield strength. The fracture energy has a significant effect on the deformation/failure mode of the Ti80 alloy plate. Compared to the yield strength, the energy absorbtion is less sensitive to the fracture energy.

The results can provide references for the impact resistance design of Ti80 alloy structures.