Crack growth and closure effects under far-field cyclic compression in a SiC-whisker-reinforced 2124 aluminum composite

Journal Article · Wed Mar 31 23:00:00 EST 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90358-Y· OSTI ID:6514822

Kwon, Dongil ^[1]; Kim, Younghwan ^[2]; Lee, Sunghak ^[3]

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1. Changwon National Univ. (Korea, Republic of)
2. Research Inst. of Industrial Science and Technology, Pohang (Korea, Republic of)
3. Pohang Inst. of Science and Technology (Korea, Republic of)

In this study, cyclic compression fatigue tests were carried out on CT-type specimens of an aluminum matrix composite reinforced with SiC whiskers. The material used in this study was a 2124 Al-SiC[sub w] composite, manufactured by power metallurgy techniques and containing 15 v/o reinforcing SiC whisker. The crack closure induced by crack-face roughness in the wake region is found to be an important factor in limiting total fatigue crack growth distance in a 2124 Al-SiC[sub w] composite under cyclic compression. The critical saturation crack length in cyclic periodic compression loading can be controlled by compressive overload application, which decreases the crack-face roughness; here, a fatigue crack of 0.41 mm in length was obtained under cyclic compression. The tendency for the tension fatigue crack to bypass SiC whiskers microscopically and whisker-rich regions macroscopically leaves very rough features on fracture surfaces of the composite. However, most compression-fatigued fracture surfaces are found to be relatively flat, except around the crack tip region, which has an appearance (growth mechanism) similar to the tension-fatigued region.

• OSTI ID: 6514822
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 28:7; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
COMPRESSION
CRACK PROPAGATION
CRYSTALS
DATA
EXPERIMENTAL DATA
FATIGUE
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
MONOCRYSTALS
NUMERICAL DATA
ROUGHNESS
SILICON CARBIDES
SILICON COMPOUNDS
SURFACE PROPERTIES
WHISKERS