Effect of thermal residual stresses on the stress-strain behavior of metal-matrix composites. Master's thesis
A parametric study was conducted to assess the effect of thermal residual stresses on the stress-strain response of a fiber-reinforced metal-matrix composite. The material chosen for investigation was silicon carbides/whisker reinforced Al 6061 system. The effects of fiber volume fraction, fiber aspect ratio and fiber spacing were analyzed within the framework of axisymmetric finite element models to determine the overall constitutive response of the composite materials as well as to solve for local field quantities in the fiber and matrix. The composite was modeled as a periodic array of cylindrical fibers, laterally aligned in one model and staggered in the other. Perfect interfacial bonding and complete fiber alignment with the tensile axis were assumed. The results indicated that (1) composite stiffness, yield strength and work hardening rate increased with increasing volume fraction and fiber aspect ratio and (2) variations in fiber spacing primarily affect work hardening rate and have negligible effect on composite stiffness. It was found that the presence of residual stresses affected the stress-strain behavior of the composite by influencing the load transfer characteristics between the matrix and fiber as well as the initiation and growth of plastic deformation in the matrix.
- Research Organization:
- Naval Postgraduate School, Monterey, CA (United States)
- OSTI ID:
- 5159299
- Report Number(s):
- AD-A-238797/5/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
ALIGNMENT
ALLOYS
ALUMINIUM ALLOYS
BONDING
CARBIDES
CARBON COMPOUNDS
CERAMICS
COMPOSITE MATERIALS
ELEMENTS
FABRICATION
FIBERS
HARDENING
INTERFACES
JOINING
MATERIALS
MATHEMATICAL MODELS
MATRIX MATERIALS
MECHANICAL PROPERTIES
METALS
PARAMETRIC ANALYSIS
REINFORCED MATERIALS
RESIDUAL STRESSES
SILICON CARBIDES
SILICON COMPOUNDS
STRESSES
TENSILE PROPERTIES
THERMAL STRESSES
YIELD STRENGTH