Non-cohesive jet formation of Zr-based amorphous alloy shaped charge liners: a predictive model

This study develops a theoretical model to predict the formation mechanism of non-cohesive jets from Zr-based amorphous alloy liners by integrating compressible circular flow theory with the JH-2 material model. Through a combination of theoretical analysis, experimental verification, and numerical simulation, the formation characteristics of Zr-based amorphous alloy jets were systematically investigated. Jet formation experiments were conducted, and X-ray image results showed that the morphology of Zr-based amorphous alloy (Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5, Vit1) jets exhibited typical discrete characteristics. The results from numerical simulations aligned well with the experimental data, validating the applicability of the JH-2 model for Zr-based amorphous alloy materials. The predictive model proposes the existence of a maximum collapse angle [Formula: see text] during the collapse process of Zr-based amorphous alloy liners, explaining why these jets exhibit non-cohesive characteristics despite not satisfying the sound velocity criterion. Additionally, a correction was applied to the dimensionless ratio [Formula: see text], reducing the model's prediction error to within 0.56%. The model developed in this study can accurately predict the dynamic forming process of zirconium-based amorphous alloy jets, including the formation states (cohesive or non-cohesive) of each element of the liner during the collapse process.