The effect of shot particles on the fatigue of Kaowool fiber-reinforced 339 aluminum

Journal Article · Fri Jan 01 04:00:00 EST 1999 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-999-0207-5· OSTI ID:316076

Baxter, W J ^[1]; Alostaz, A ^[2]; Jasiuk, I ^[3]

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1. General Motors Research and Development Center, Warren, MI (United States). Metallurgy Dept.
2. Michigan State Univ., Lansing, MI (United States). Dept. of Materials Science and Mechanics
3. Georgia Inst. of Tech., Atlanta, GA (United States). George Woodruff School of Mechanical Engineering

The addition of Kaowool fibers substantially increases the fatigue strength of 339 aluminum at 300 C. However, the fatigue life of these composites is limited by the presence of Kaowool shot particles, which act as crack initiation sites. An elastic analysis of the stress concentrations associated with this type of defect shows that a crucial parameter is the distance of the particle from the free surface. As the distance from the surface decreases, the stress concentration factor increases substantially and attains maximum value when a small portion of the particle has been removed by machining. The relationship between the distance from the surface and the stress concentration factor is in excellent agreement with the particle geometries observed at fatigue crack initiation sites.

• OSTI ID: 316076
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 1 Vol. 30; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
ALUMINIUM OXIDES
COMPOSITE MATERIALS
DEFECTS
FATIGUE
FIBERS
PARTICULATES
SILICON OXIDES
STRESSES
TEMPERATURE RANGE 0400-1000 K