Computational Representation of Constitutive Relations for Porous Material
Final rept. 24 Jan 1973-31 Mar 1974
STANFORD RESEARCH INST MENLO PARK CA
Pagination or Media Count:
Porous materials are used as a protection against x-radiation because of their ability to minimize the stress generated by the radiation and to attenuate that stress as it propagates. For accurate design of this protection, wave propagation calculations are made to simulate the radiation deposition, stress generation, propagation, and spallation caused by stress waves. For such a calculation it is necessary to have a constitutive relation stress-strain- energy relation, or equation of state that describes the materials response to heating and to compressive and tensile loading. The objective of this report is to document a set of constitutive relations that provide for Elastic and plastic compaction loading with rate dependence Heating or cooling that can occur simultaneously with loading Unloading and rate-dependent fracture and, Melting and vaporization, with explicit treatment of solid, liquid, vapor, and mixed phases. Accompanying these relations is a users manual that includes a derivation of the equations for the model and procedures for using it in Lagrangian wave propagation computer programs.
- Miscellaneous Materials
- Solid State Physics