The Initiation and Growth of Fatigue Cracks in Filament-Reinforced Aluminum Alloys.
Abstract
The low-cycle fatigue behavior of filamentary composites of 1235 aluminum-beryllium, 6061 aluminum-beryllium, and 7075 aluminum-boron were compared. The effects of the strength and ductility of the filaments and matrix, and the role of interfaces on fatigue hardening, and on fatigue-crack initiation and growth were evaluated to develop guidelines for the design of fatigue-resistant composites. Generally, brittle filaments, a ductile matrix, weak interfacial bonds, and a large modulus difference between constituents are the factors which lead to greater fatigue resistance in filament-reinforced metals. The observed modes of fatigue-crack growth confirmed the theoretical predictions of the effects of stress distribution at a crack tip at an inferface, and extended the applicability of these predictions to filamentary composites. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1971
- Accession Number
- AD0722009
Entities
People
- J. R. Hancock
Organizations
- MRIGlobal