Mode I fatigue cracking in a fiber reinforced metal matrix composite

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

DOI:https://doi.org/10.1016/0956-7151(93)90375-3· OSTI ID:6269502

Walls, D P; Bao, G; Zok, F W ^[1]

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1. Univ. of California, Santa Barbara, CA (United States). Materials Dept.

The mode I fatigue crack growth behavior of a fiber reinforced metal matrix composite with weak interfaces is examined. In the longitudinal orientation, matrix cracks initially grow with minimal fiber failure. The tractions exerted by the intact fibers shield the crack tip from the applied stress and reduce the rate of crack growth relative to that in the unreinforced matrix alloy. In some instances, further growth is accompanied by fiber failure and a concomitant loss in crack tip shielding. The measurements are compared with model predictions, incorporating the intrinsic fatigue properties of the matrix and the shielding contributions derived from the intact fibers. The magnitude of the interface sliding stress inferred from the comparisons between experiment and theory is found to be in broad agreement with values measured using alternate techniques. The results also indicate that the interface sliding stress degrades with cyclic sliding, an effect yet to be incorporated in the model. In contrast, the transverse fatigue properties are found to be inferior to those of the monolithic matrix alloy, a consequence of the poor fatigue resistance of the fiber/matrix interface.

• OSTI ID: 6269502
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:7; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
CRACK PROPAGATION
DATA
ELECTRON MICROSCOPY
ELEMENTS
EVALUATION
EXPERIMENTAL DATA
FAILURES
FATIGUE
FIBERS
INFORMATION
INTERFACES
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
METALS
MICROSCOPY
NUMERICAL DATA
SCANNING ELECTRON MICROSCOPY
SILICON CARBIDES
SILICON COMPOUNDS
TESTING
TIN ALLOYS
TITANIUM
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
TITANIUM-BETA
TRANSITION ELEMENTS
VANADIUM ALLOYS