Experimental and theoretical investigations of shock-induced flow of reactive porous media
- Sandia National Labs., Albuquerque, NM (United States)
- Los Alamos National Lab., NM (United States)
In this work, the microscale processes of consolidation, deformation and reaction features of shocked porous materials are studied. Time- resolve particle velocities and stress fields associated with dispersive compaction waves are measured in gas-gun experiments. In these tests, a thin porous layer of HMX is shock-loaded at varied levels. At high impact, significant reaction is triggered by the rapid material distortion during compaction. In parallel modeling studies, continuum mixture theory is applied to describe the behavior of averaged wave-fields in heterogeneous media. One-dimensional simulations of gas-gun experiments demonstrate that the wave features and interactions with viscoelastic materials in the gauge package are well described by mixture theory, including reflected wave behavior and conditions where significant reaction is initiated. Numerical simulations of impact on a collection of discrete HMX `crystals` are also presented using shock physics analysis. Three-dimensional simulations indicate that rapid distortion occurs at material contact points; the nature of the dispersive fields includes large amplitude fluctuations of stress with wavelengths of several particle diameters. Localization of energy causes `hot-spots` due to shock focusing and plastic work as material flows into interstitial regions. These numerical experiments demonstrate that `hot-spots` are strongly influenced by multiple crystal interactions. This mesoscale study provides new insights into micromechanical behavior of heterogeneous energetic materials.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000; W-7405-ENG-36
- OSTI ID:
- 405753
- Report Number(s):
- SAND-96-1378C; LA-UR-96-4054; CONF-961194-3; ON: DE97000887
- Resource Relation:
- Conference: 1996 JANNAF combustion subcommittee and propulsion systems: hazards subcommittee joint meeting, Monterey, CA (United States), 4-8 Nov 1996; Other Information: PBD: [1996]
- Country of Publication:
- United States
- Language:
- English
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