Mechanical behavior of Al-Li/SiC composites. Part 3: Micromechanical modeling
- Polytechnic Univ. of Madrid (Spain). Dept. of Materials Science
A micromechanical model is developed to compute the stress-strain curve of particle-reinforced metal-matrix composites under monotonic and cyclic deformation. The composite was modeled as a three-dimensional array of hexagonal prisms, each containing an intact or fractured reinforcement. The average stresses acting on the intact and damaged cells--as well as on the ceramic particles--were computed from the finite-element analysis of axisymmetric cylindrical cells, and the overall composite response was then calculated through an isostrain approach. The model was validated against the experimental results, reported in Parts 1 and 2 of this article, for an 8090 Al alloy reinforced with 15 vol pct SiC particles, where the matrix and reinforcement properties were obtain3ed from mechanical tests on the unreinforced alloy and from quantitative microscopy analyses of the fraction of broken reinforcements in the composite. The critical mechanisms which controlled the deformation and damage processes in the composite during monotonic and cyclic deformation are discussed in light of the model results.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 335304
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 40, Issue 3; Other Information: PBD: Mar 1999
- Country of Publication:
- United States
- Language:
- English
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