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Lifetimes of fiber composites under sustained tensile loadingResults are presented for a study intended to summarize lifetime data on several fiber/epoxy composite materials subjected to sustained uniaxial tensile loading, to report preliminary results of an accelerated test method for predicting the life of simple composites, and to describe related work in progress on pressure vessels and other filament-wound structures. The lifetime performance of the tested composites was compared by plotting the percent of ultimate strength (applied fiber stress normalized with respect to fiber failure stress in a composite) versus lifetime. In terms of performance in long-term tensile applications, the tested composites are ranked in the following order: graphite/epoxy, Be wire/epoxy, Aramid/epoxy, and S-glass/epoxy. The accelerated test using temperature and stress to simulate the passage of time proves to be encouraging, at least in the case of the Aramid/epoxy composite. The potential of a statistical analysis based on Weibull distribution analyses or a power law relationship is demonstrated.
Document ID
19770049386
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chiao, T. T.
(California Univ. Livermore, CA, United States)
Sherry, R. J.
(California, University Livermore, Calif., United States)
Chiao, C. C.
(Dow Chemical Western Research Center Walnut Creek; California, University, Livermore, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
March 1, 1977
Subject Category
Composite Materials
Report/Patent Number
UCRL-78367
Meeting Information
Meeting: International Conference on Fracture Mechanics and Technology
Location: Hong Kong
Start Date: March 21, 1977
End Date: March 25, 1977
Accession Number
77A32238
Funding Number(s)
CONTRACT_GRANT: NASA ORDER C-13980-C
CONTRACT_GRANT: W-7405-ENG-48
Distribution Limits
Public
Copyright
Other

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