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Effect of fiber diameter and matrix alloys on impact-resistant boron/aluminum compositesEfforts to improve the impact resistance of B/Al are reviewed and analyzed. Nonstandard thin-sheet charpy and Izod impact tests and standard full-size Charpy impact tests were conducted on composites containing unidirectional 0.10mm, 0.14mm, and 0.20mm diameter boron fibers in 1100, 2024, 5052, and 6061 Al matrices. Impact failure modes of B/Al are proposed in an attempt to describe the mechanisms involved and to provide insight for maximizing impact resistance. The impact strength of B/Al was significantly increased by proper selection of materials and processing. The use of a ductile matrix and large diameter boron fibers gave the highest impact strengths. This combination resulted in improved energy absorption through matrix shear deformation and multiple fiber breakage.
Document ID
19770004175
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Mcdanels, D. L. (NASA Lewis Research Center Cleveland, OH, United States)
Signorelli, R. A. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
November 1, 1976
Subject Category
Composite Materials
Report/Patent Number
E-8648
NASA-TN-D-8204
Accession Number
77N11118
Funding Number(s)
PROJECT: RTOP 505-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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