**A theoretical study of the stress relaxation in HMX on the picosecond
time scale**

Y Long and J Chen, MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING, 23, 085001 (2015).

DOI: 10.1088/0965-0393/23/8/085001

The stress relaxation model of beta-HMX on the picosecond time scale is studied by a theoretical approach. The relaxation of normal stress is contributed by lattice vibration, and the relaxation of shear stress is contributed by molecular rotation. Based on this model, the energy dissipation rule of the elastic wave and the profile of the shock wave are investigated. We find at low frequency the dissipation rate of the elastic wave is proportional to the power function of frequency, and under high speed shock loading the width of the stress relaxation zone is less than 0.3 mu m; there is a pressure peak with a height of 14 GPa near the wave front.

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