Zr_77.1Cu₁₃Ni_9.9 非晶合金破片侵彻 LY12 铝合金及TC4 钛合金靶板毁伤后效及机理对比研究

Zr-based bulk metallic glass is an energetic structural material with great development potential, its fragments show significantly different damage effects when the warhead penetrates different alloy armors. In this study, Zr_77.1Cu₁₃Ni_9.9 bulk metallic fragments were fired by a ballistic rifle at a speed of 1 200 m/s to penetrate 8 mm thick LY12 aluminum alloy and TC4 titanium alloy shielding targets, respectively. The process of the fragment cloud formation and its damage was captured based on high-speed photography technology. Meanwhile, in order to reveal the damage mechanism to the witness targets, based on finite element method (FEM) / smoothed particle hydrodynamics (SPH) adaptive coupling method, a series of penetrating stages was simulated, such as the cratering, the quasi-steady penetration, and the end of penetration, as well as the complex physical process of fragment cloud formation. The results show that due to the higher strength of the TC4 titanium alloy compared to that of the LY12 aluminum alloy, it takes longer for the fragments to penetrate the TC4 shielding target, and the maximum equivalent stress in the TC4 target plate is about three times larger than that in the LY12 plate. For the TC4 target plate, simulations prove that a stronger interaction occurs between the fragment and the target plate, resulting in a larger high strain area at the front of the fragment, hence, severer fragmentation and more dispersed fragment cloud are generated, causing larger damaging area on the witness target.