Thermoviscoplastic analysis of metal matrix composites

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:7228789

Yeh, Nanming

Micromechanics-based thermoviscoplasticity theories based on over-stress are developed for metal matrix composites. Three micromechanics models, the vanishing fiber diameter model, the Mori-Tanaka method, and the bimodal model, are used in conjunction with the orthotropic thermoviscoplasticity theory based on overstress to study the thermomechanical behavior. Numerical experiments using the vanishing fiber diameter model and the orthotropic thermoviscoplasticity theory based on overstress were performed to study the effects of residual stresses, volume fraction, creep, thermal cycling, and ratchetting on the behavior of metal matrix composites. For the purpose of modeling the matrix-dominated low-cycle fatigue damage of metal matrix composites under multiaxial creep-fatigue interaction, an incremental multiaxial life prediction law for the metal matrix is proposed. This model consists of the three-dimensional, cyclic neutral thermoviscoplasticity theory based on overstress combined with a multiaxial damage accumulation law to compute the life time or cycles to crack initiation.

• Research Organization: Rensselaer Polytechnic Inst., Troy, NY (United States)
• OSTI ID: 7228789
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
COMPOSITE MATERIALS
ELEMENTS
FATIGUE
FUNCTIONAL MODELS
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
METALS
PLASTICITY
RESIDUAL STRESSES
STRESSES
THERMAL CYCLING
VISCOSITY