DPDE-based mesoscale simulations of shock response of HE composites

18th APS-SCCM; 24th AIRAPT

Sood, P.^1 ; Dwivedi, S.^1 ; Brennan, J.^2 ; Thadhani, N.^1 ; Horie, Y.^3

School of Materials Sci. Eng., Georgia Institute of Technology, Atlanta

GA

30332, United States^1

U.S. Army Research Laboratory, Aberdeen Proving Ground, MD

21005, United States^2

Air Force Research Lab (Retd.), Eglin Air Force Base, FL

32547, United States^3

关键词: Artificial viscosity;    Computational framework;    Dissipative particle dynamics;    Interparticle potential;    Longitudinal stress;    Mesoscale simulation;    Multi-scale simulation;    Temperature increase;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/17/172002/pdf
DOI  :  10.1088/1742-6596/500/17/172002

来源: IOP

【 摘 要 】

The dissipative particle dynamics with energy conservation (DPDE) method is extended to simulate the shock response of high energetic (HE) materials at micron length scales. The symmetrical impact of an RDX impactor and target plates with 1μm diameter spheres is simulated at planar impact velocities of 208 m/s and 876 m/s with a Lennard-Jones-like potential, dissipative, and random forces, and artificial viscosity force between particles. The in situ shock quantities were obtained using Hardy's averaging. In situ longitudinal stresses from simulations were 0.84 and 3.82 GPa. Values from the literature are 0.81 and 2.92 GPa at the two impact velocities, respectively. The uniaxial strain condition was predicted with equal lateral stresses and negligible shear stresses. The higher stress value at 876 m/s may be due to lack of inelasticity in the interparticle potential. The temperature increases of 5.50K and 93.70K, respectively, were predicted assuming dissipation of a fraction of the potential energy. It is concluded that the DPDE method holds promise for a unified computational framework for multi-scale simulations of HE.