An analytical study of residual stress effects on uniaxial deformation of whisker reinforced metal-matrix composites

Journal Article · Sun Feb 28 23:00:00 EST 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90023-L· OSTI ID:6048683

Dutta, I; Sims, J D; Seigenthaler, D M ^[1]

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1. Naval Postgraduate School, Monterey, CA (United States). Dept. of Mechanical Engineering

Finite element modeling was utilized to simulate the stress-strain response of discontinuous SiC whisker reinforced aluminum-matrix composites, accounting for the thermal residual stresses (TRS) generated during solution treatment. The contributions of various micro-mechanisms to overall composite strengthening and deformation, and the impact of TRS on each mechanism were explicitly evaluated. It was inferred that constrained matrix plastic flow and matrix-to-fiber load transfer are the predominant sources of strengthening, with enhanced matrix dislocation density playing a secondary role. Residual stresses were found to significantly affect each of the operative strengthening mechanisms and hence the composite properties. Comparison with experiments revealed that the trends predicted by the model are generally consistent with actual composite behavior, although the model overpredicts work hardening rate. A parametric study of the effects of whisker volume fraction, aspect ratio and spacing on tensile and compressive deformation was also conducted. The results showed that increasing volume fraction, close end-to-end spacing and large aspect ratios result in greater strength and stiffness.

• OSTI ID: 6048683
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:3; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM CARBIDES
ALUMINIUM COMPOUNDS
CALCULATION METHODS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRYSTALS
DENSITY
FINITE ELEMENT METHOD
HARDENING
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MONOCRYSTALS
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS
STRESS ANALYSIS
STRESSES
TENSILE PROPERTIES
THERMAL STRESSES
WHISKERS