An analysis of the influence of reinforcement fracture on the strength of discontinuously-reinforced metal-matrix composites

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(95)90273-2· OSTI ID:6540407

Llorca, J ^[1]

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1. Polytechnic Univ. of Madrid (Spain). Dept. of Materials Science

A micromechanical model was developed to study the influence of reinforcement fracture on the tensile strength of discontinuously-reinforced metal-matrix composites. The analyses were carried out within the framework of the shear lag model, which provides simple expressions for the average stresses acting on the reinforcement as a function of the matrix strength and of the reinforcement aspect ratio. The reinforcement strength was assumed to follow the Weibull statistics, and in this way, the fraction of intact and broken reinforcements can be obtained for any combination of matrix and reinforcement properties. The overall composite strength was then calculated by assuming that broken reinforcements do not contribute to the composite strengthening. The model was employed to study the influence of various parameters, such as matrix and reinforcement strength, and reinforcement aspect ratio and size, on the strength of discontinuously-reinforced metal-matrix composites. Finally, the model predictions were compared with experimental results on several high strength Al alloys reinforced with SiC particulates.

• OSTI ID: 6540407
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 43:1; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
FRACTURE MECHANICS
MATERIALS
MATHEMATICAL MODELS
MATHEMATICS
MECHANICAL PROPERTIES
MECHANICS
SILICON CARBIDES
SILICON COMPOUNDS
STATISTICS
TENSILE PROPERTIES