Computational modeling of metal matrix composite materials-III. Comparisons with phenomenological models

Journal Article · Sat May 01 04:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90257-S· OSTI ID:5992086

McHugh, P E; Shih, C F ^[1]; Asaro, R J ^[2]

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1. Brown Univ., Providence, RI (United States). Division of Engineering
2. Univ. of California, San Diego, CA (United States). Dept. of AMES

The mechanical behavior of particulate reinforced metal matrix composites, in particular an SiC reinforced Al-3 wt% Cu model system, was analyzed numerically and analytically. In this article the results of the computational micromechanics modeling are compared with those of simpler and more approximate analytical/numerical models. The simpler approaches considered use phenomenological theories of plasticity and power-law strain hardening. Models that predict overall composite behavior make use of a result, valid for incompressible materials in small strain, that both pure matrix material and composite harden with the same hardening exponent. Results of micromechanical simulations, with power-law slip system hardening, show that in a very approximate sense over restricted strain regions, power-law hardening is preserved with the power-law exponent tending to increase with volume fraction. The results of the computations presented in the previous article are compared with the predictions of one such analytical/numerical model, where the matrix hardening function is fitted to the unreinforced polycrystal stress-strain response. This model employs the self-consistent method to quantify strengthening. There is good agreement between the computed and predicted results. Simulations are performed using existing reinforcement geometry but replacing the physically based crystal plasticity theory with the phenomenologically based J[sub 2] flow theory. The results are in good qualitative agreement with those of the original crystal plasticity simulations at both the microscale and the macroscale. Deformation patterns in the J[sub 2] flow theory composites are smoother and tend to be less localized than those in the crystal plasticity composites; however, these features depend strongly on volume fraction and morphology.

• OSTI ID: 5992086
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:5; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
COPPER ALLOYS
DEFORMATION
EVALUATION
HARDENING
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MORPHOLOGY
PLASTICITY
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS
SIMULATION
STRAINS
STRESSES
TENSILE PROPERTIES