Shock compression response of alumina-THV composites
Abstract
The shock compression response of several THV-alumina particle composites (where THV is a terpolymer of tetrafluoroethylene, hexafluoropropylene, and vinyldiene fluoride) was investigated based on experiments performed in the pressure range of 2–6 GPa. The composites, composed of 25% by volume of either 1, 10, or 100 μm Al2O3, had varying degrees of porosity. The high level of porosity, particularly in the 1 μm Al2O3 composite, obscured determination of any particle size effects. In general, the composites displayed a stiffer shock response than expected, based on the known response of the constituent materials, with the 10 μm Al2O3 composite being slightly stiffer than the 100 μm composite. It is argued that a possible way to describe the stiffer shock compression response is by assigning a higher value for the “effective” Grüneisen parameter γ to the composites. The higher value is consistent with arguments made in the literature that γ for polymers is much higher (by as much as an order of magnitude) than the often reported values (generally ∼1 or less for polymers). The particle size effect can, however, possibly explain the difference in the stiffness between 10 and 100 μm Al2O3 composites, which is consistent with results reported in the literature.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 01, 2011
- Source ID
- 10.1063/1.3525761
Entities
People
- Christopher Neel
- Naresh N. Thadhani
Organizations
- Georgia Tech
- Office of Naval Research