NUMERICAL STUDY OF THE FRICTIONAL INITIATION MECHANISM OF ENERGETIC MATERIALS UNDER LOW-VELOCITY IMPACT

Abstract

This paper presents the results of a comprehensive study on the frictional initiation mechanism of energetic materials (EM) under low-velocity impact. Based on data from physical experiments involving the penetration of a spherical impactor into an HMX-containing EM, a self-consistent mathematical model has been developed. This model describes the coupled motion of the impactor and the elastoplastic flow of the material. It accounts for the dissipation of the impactor's kinetic energy through plastic work and dry friction forces at the contact boundary, enabling the analysis of hot spot formation mechanisms.
The Nelder-Mead algorithm was employed to solve the inverse problem, identifying key material strength parameters: yield strength and shear modulus. Numerical simulations of temperature fields were conducted for two loading regimes - with and without explosion initiation. The results of the computational experiment indicate that the conditions necessary for the onset of explosive transformation are achieved.