A generalized thermomechanical constitutive model for metal-matrix composites with plastic strain and damage

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:7197963

Bryan, S K

A generalized model for materials with inelastic strain and damage which is applicable to metal-matrix composites is developed. The constitutive framework is based on a continuum mechanics approach with constraints on the relationships provided by the laws of thermodynamics. The result is a derivation of the Helmholtz free energy function which is a sum of the free energies for elastic strain, plastic strain, and damage, and a constitutive equation where all coefficients are equal to those for the initial elastic material. In addition, the model is applicable for all material types from orthotropic to isotropic and, for a specific material system, requires only the development of the material-dependent damage-growth laws to complete the model. Although the resulting equations are similar to those assumed in previous damage mechanics research, this study lends credence via derived information to those previously assumed.

• Research Organization: Texas A and M Univ., College Station, TX (USA)
• OSTI ID: 7197963
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
COMPOSITE MATERIALS
DAMAGE
ELEMENTS
ENERGY
FREE ENERGY
FUNCTIONAL MODELS
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
METALS
PHYSICAL PROPERTIES
PLASTICITY
STRAINS
THERMODYNAMIC PROPERTIES