High-precision analysis of J-C dynamic constitutive parameters of Ti alloy and research on its ballistic performance

Abstract:

The research on the dynamic mechanical behavior and deformation localization of metals under high-speed impact, that is, the adiabatic shear deformation, is of great significance to the scientific application of materials under impact environments. J-C constitutive equation is an effective method to deal with the problems of large strain, high strain rate and high temperature of engineering materials. The software " J-C constitutive parameter and damage model parameter measurement system of materails -C dynamic constitutive parameters of a near α Ti alloy by clustering global optimization method, which avoids the large amount of calculation and complexity of traditional measurement methods and even can not reflect the shortcomings such as parameter relevance. Through the anti-elasticity test of the titanium alloy target plate, using the J-C constitutive parameters, the commercial dynamics calculation software AUTODYN was used to complete the simulation of the shooting test. The simulation results are in good agreement with the test data, which verifies accuracy and precision of the accuracy of the J-C dynamic parameters. Bullet hole microstructure analysis shows that adiabatic shear bands can be observed at the ends of the cracks, which proves that the initiation of cracks is caused by adiabatic shear bands, indicating that the failure mode under high-speed impact dynamic environment is mainly adiabatic shear.

Key words:Ti alloy; CGO; J-C constitutive equation; ballistic performance