Abstract

High‐explosive (HE) material consists of large‐sized grains with micron‐sized embedded impurities and pores. Under various mechanical/thermal insults, these pores collapse generating high‐temperature regions leading to ignition. A computational study has been performed to investigate the mechanisms of pore collapse and hot spot initiation in TATB crystals, employing the thermo‐hydrodynamics arbitrary‐Lagrange‐Eulerian code ALE3D. This initial study includes non‐reactive dynamics to isolate the thermal and hydrodynamical effects. Two‐dimensional high‐resolution large‐scale meso‐scale simulations have been undertaken. We study an axisymmetric configuration for pore radii ranging from 0.5 to 2 μm, with initial shock pressures in the range from 3 to 11 GPa. A Mie‐Gruneisen Equation of State (EOS) model is used for TATB, and includes a constant yield strength and shear modulus; while the air in the pore invokes a Livermore Equation of State (LEOS) model. The parameter space is systematically studied by considering various shock strengths, pore diameters and material properties. We find that thermal diffusion from the collapsed pores has an important effect in generating high‐temperature hot spots in the TATB. LLNL‐PROC‐415378

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.