DPDE-based mesoscale simulations of shock response of HE composites

• Published in: Journal of physics. Conference series Vol. 500; no. 17; p. 172002
• Main Authors: Sood, P, Dwivedi, S, Brennan, J, Thadhani, N, Horie, Y
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.01.2014
• Subjects: Computer simulation; Dissipation; Dynamics; Elasticity; Energy dissipation; Impact velocity; Particles (of physics); Particulate composites; Physics; Potential energy; Shear stress; Simulation; Stresses; Viscosity
• ISSN: 1742-6596; 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/500/17/172002

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 5.5 0K and 93.7 0K, 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.