Continuum theory for localized heating in granular materials

Conference · Sun Jan 01 04:00:00 EST 1978

OSTI ID:6488866

Nunziato, J W; Walsh, E K

Granular materials, when subject to high rates of deformation, exhibit the effects of localized internal heating due to grain friction and void closures. This is particularly true in the case of shock wave-type loading. A continuum theory presented for granular materials by Goodman and Cowin is extended to include the effects of localized heating. Central to the basic theory is the concept of a distributed body in which the bulk density of the material is represented in terms of the density of the granules and the volume fraction of the granules. In this theory, the volume fraction is an independent kinematical variable and, thus, an additional force balance equation is specified which serves to account for the dynamical effects associated with the compaction or distention of the void volume. In this way, the theory provides a continuum interpretation of the two possible modes of deformation observed in granular and porous materials, i.e., compressibility of the granules and compaction or distention of the voids.

• Research Organization: Sandia Labs., Albuquerque, NM (USA); Florida Univ., Gainesville (USA)
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 6488866
• Report Number(s): SAND-78-1436C; CONF-781206-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ENERGY TRANSFER
HEAT TRANSFER
REACTOR MATERIALS