Hot Spot Initiation and Growth in Shock-Induced RDX through MD-informed Void Collapse Simulations

POSTER

Abstract

Continuum-scale shock-induced void collapse resulting in hot spot formation is crucial to understanding the initiation of detonation inof energetic materials. Hotspots, i.e., localized areas of high temperature, can lead to chemical reactions in the material causing a shock to detonation wave transition. In this work, circular void collapse computations were conducted using 1,3,5-Trinitro-1,3,5-triazinane (RDX) as the energetic material. These simulations were conducted with an Eulerian hydrocode, SCIMITAR3D, which uses a sharp interface, and level set based methods for modeling material dynamics. A circular void is embedded into a block of RDX which then undergoes a reverse ballistic shock, where . A varying a range of shock velocities and void sizes are explored. The calculations employ MD-derived material models such as a polynomial equation of state, temperature-dependent specific heat function, pressure-dependent melting temperatures and chemical reaction rates. The resulting void collapse and hot spot characteristics can be extracted and compared with coarse grain and atomistic model simulations. The overall goal of this work is to develop a rate-dependent Johnson-Cook plasticity model for RDX, and additionally eventually to establish an understanding of hot spot formation in the material.

Presenters

  • Jacob A Herrin

    • Department of Mechanical Engineering, The University of Iowa, Iowa City, IA, United States
    • University of Iowa

Authors

  • Jacob A Herrin

    • Department of Mechanical Engineering, The University of Iowa, Iowa City, IA, United States
    • University of Iowa

  • Oishik Sen

    • Univ of Iowa
    • University of Iowa
    • Department of Mechanical Engineering, The University of Iowa, Iowa City, IA, United States

  • Garrett M Tow

    • Weapons and Materials Research Directorate, U.S. Army DEVCOM Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005, USA
    • Army Research Laboratory, Adelphi, MD
    • U.S. Army Combat Capabilities Development Command (DEVCOM) Army Research Laboratory, Aberdeen Proving Ground, MD, United States
    • U.S. Army Research Laboratory

  • John K Brennan

    • Weapons and Materials Research Directorate, U.S. Army DEVCOM Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005, USA
    • U.S. Army Research Laboratory
    • U.S. Army Combat Capabilities Development Command (DEVCOM) Army Research Laboratory, Aberdeen Proving Ground, MD, United States

  • James P Larentzos

    • Weapons and Materials Research Directorate, U.S. Army DEVCOM Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005, USA
    • U.S. Army Research Laboratory
    • Army research Laboratory, Adelphi, MD
    • U.S. Army Combat Capabilities Development Command (DEVCOM) Army Research Laboratory, Aberdeen Proving Ground, MD, United States

  • H.S. Udaykumar

    • The University of Iowa
    • University of Iowa
    • Department of Mechanical Engineering, The University of Iowa
    • Department of Mechanical Engineering, The University of Iowa, Iowa City, IA, United States