Crack deflection during fatigue and monotonic fracture of a SiC whisker reinforced 2009 aluminium alloy

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90313-1· OSTI ID:7276545

Xu, X X ^[1]; King, J E; Bhattacharjee, D ^[2]

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1. Tsinghua Univ., Beijing (China). Dept. of Mechanical Engineering
2. Univ. of Cambridge (United Kingdom). Dept. of Materials Science and Metallurgy

Fatigue crack growth under Mode 1 loading, and static fracture in both symmetrical and asymmetrical notched four point bends specimens, have been examined in SiC whisker reinforced 2009 aluminium alloy. In the fatigue tests a range of orientations of the starter notch, with respect to the extrusion direction, L, was examined. Slanted crack propagation was observed in all specimens except that in the T-L configuration. For the monotonic tests the specimen orientation (L-T) remained constant whilst the ratio of Mode 1 to Mode 2 loading was varied. Again crack deflection was observed in all cases apart from the L-T specimen under pure Mode 1 loading. Whisker debonding was found to be the dominant factor controlling crack deflection, Independent of the mixing of the loading mode. Under mixed-mode static loading, the deflection angle was controlled by the average orientation of the whiskers subject to the asymmetrically distributed maximum principal stress. In fatigue loading, however, the crack tended to follow the most frequently observed whisker orientation. These contrasting observations are interpreted in terms of the different sampling volumes at the crack tip in monotonic fracture and in fatigue crack growth.

• OSTI ID: 7276545
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:7; 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
CRACK PROPAGATION
DATA
EXPERIMENTAL DATA
FATIGUE
FRACTURE PROPERTIES
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL DATA
SILICON CARBIDES
SILICON COMPOUNDS