Numerical Calculation of Thermodynamic Response of Shocked HMX Single Crystal at Elevated Temperatures

DING Kai;WANG Xinjie;HUANG Hengjian;WU Yanqing;HUANG Fenglei

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  • Sponsored by: China Association for Science and Technology (CAST)

    Editor-In-Chief: Xu Yida

    ISSN 1000-1093

    　

  • Hosted By: China Ordnance Society

    Published By: Acta Armamentarii

    CN 11-2176/TJ

Acta Armamentarii, a Chinese monthly journal, was first published in 1979. The journal is supervised by China Association for Science and Technology, sponsored by China Ordnance Society，and edited and published by Editorial Board of Acta Armamentarii. The Journal is included in all important domestic databases，and also collected by Engineering Index (EI, USA), Chemical Abstracts (CA, USA), Science Abstracts (SA, UK）, Abstract Journal (AJ, Russia), and Current Bibliography on Science and Technology(CBST).Acta Armamentarii has been selected into the journal Of Ordnance Science and Technology (Weapons Industry) Field Of High Quality Scientific and Technological Periodical Classification Catalogue (2022 edition), ranking T1, and the journal of Automotive Engineering Field of High Quality Scientific and technological Periodical classification Catalogue, ranking T2.
Acta Armamentarii ›› 2021, Vol. 42 ›› Issue (5) : 968-978. DOI: 10.3969/j.issn.1000-1093.2021.05.009
Paper

Numerical Calculation of Thermodynamic Response of Shocked HMX Single Crystal at Elevated Temperatures

  • DING Kai1， WANG Xinjie1， HUANG Hengjian2， WU Yanqing1， HUANG Fenglei1
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Abstract

A nonlinear thermoelastic-viscoplastic model is developed for studying the thermodynamic response of octogen (HMX) single crystal at elevated temperatures, in which the thermal activation and phonon drag dislocation glide regime are considered. The proposed model can reproduce the thermal hardening behavior of Hugoniot elastic limit (HEL) of HMX single crystal in plate impact experiment. The effects of phonon scattering and radiation damping on the thermal hardening behavior are quantitatively analyzed to investigate the evolution of dislocation glide regime and the thermodynamic response at 373 K and 423 K. It is found that the thermal hardening behavior of HEL of HMX single crystal is due to the increase in phonon scattering and radiation damping with the initial temperature from 300 K to 423 K. The phonon drag coefficient is increased to strengthen the viscous friction of mobile dislocation. Therefore, the average dislocation velocity decreases from 2 237 m/s to 1 537m/s, which leads to slower plastic shear strain rate and higher flow stress. The shear modulus changes slightly with the increase in temperature (about 1.0 GPa), thus the contribution of radiation damping to thermal hardening is less than that of phonon scattering.

Key words

octogen / elevatedtemperature / Hugoniotelasticlimit / thermalhardening / dislocationglideregime

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DING Kai, WANG Xinjie, HUANG Hengjian, WU Yanqing, HUANG Fenglei. Numerical Calculation of Thermodynamic Response of Shocked HMX Single Crystal at Elevated Temperatures. Acta Armamentarii. 2021, 42(5): 968-978 https://doi.org/10.3969/j.issn.1000-1093.2021.05.009

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