Study of Constitutive Model of Ballistic Gelatin at High Strain Rate

doi:10.3969/j.issn.1000-1093.2014.01.019

Abstract

Abstract: In order to numerically simulate the terminal effect of bullet and fragment, the research status of ballistic gelatin physical properties is summarized firstly. The features of rate-dependent hyperelastic model and elastic-plastic hydrodynamic model are studied, respectively. The coefficients of equation of state of ballistic gelatin are concluded based on related experiments. The penetration of a steel sphere into a block of ballistic gelatin is studied experimentally, and is modeled using the finite element method. The comparison of the computed and experimental results shows that the elastic-plastic hydrodynamic model can simulate the experiment more accurately at high velocity impact. Ballistic gelatin is known as a rate-dependent sensitively material, but the thermal softening is dominant at high strain rate, the physical behavior can be modeled with a dynamical constitutive.

Key words: ordnance science and technology, ballistic gelatin, strain rate, elastic-plastic hydrodynamic, numerical simulation

CLC Number:

O347.3

WEN Yao-ke, XU Cheng , CHEN Ai-jun. Study of Constitutive Model of Ballistic Gelatin at High Strain Rate[J]. Acta Armamentarii, 2014, 35(1): 128-133.

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