Effects of fiber and interfacial layer architectures on the thermoplastic response of metal-matrix composites

Technical Report · Sat Aug 01 04:00:00 EDT 1992

OSTI ID:7038367

Pindera, M J; Freed, A D; Arnold, S M

Examined here is the effect of fiber and interfacial layer morphologies on thermal fields in metal matrix composites (MMCs). A micromechanics model based on an arbitrarily layered concentric cylinder configuration is used to calculate thermal stress fields in MMCs subjected to spatially uniform temperature changes. The fiber is modelled as a layered material with isotropic or orthotropic elastic layers, whereas the surrounding matrix, including interfacial layers, is treated as a strain-hardening, elastoplastic, von Mises solid with temperature-dependent parameters. The solution to the boundary-value problem of an arbitrarily layered concentric cylinder under the prescribed thermal loading is obtained using the local/global stiffness matrix formulation originally developed for stress analysis of multilayered elastic media. Examples are provided that illustrate how the morphology of the SCS6 silicon carbide fiber and the use of multiple compliant layers at the fiber/matrix interface affect the evolution of residual stresses in SiC/Ti composites during fabrication cool-down.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
• OSTI ID: 7038367
• Report Number(s): N-92-32234; NASA-TM--105802; E--7232; NAS--1.15:105802; CNN: RTOP 519-01-50
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
BOUNDARY-VALUE PROBLEMS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
COOLING
CYLINDERS
FABRICATION
FIBERS
HARDENING
INTERFACES
ISOTROPY
MATERIALS
MORPHOLOGY
RESIDUAL STRESSES
SILICON CARBIDES
SILICON COMPOUNDS
STRAIN HARDENING
STRESS ANALYSIS
STRESSES
TEMPERATURE DEPENDENCE
THERMAL STRESSES
TITANIUM ALLOYS