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Tensile and Fatigue Failure of Glass and Carbon Fiber Bundles
[Technical Report, Master's Thesis]
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Pagination or Media Count:
The use of composite materials in naval applications has been increasing, primarily due to their high strength-to-weight ratio. However, additional study is needed on the impact of cyclic loading on these materials. The goal of this study was to develop a mathematical model to predict fatigue failure, so as to be able to more accurately determine material lifetime in naval applications. Fiber bundles of either glass or carbon were used in the testing. Tests under tensile loading were conducted in order to estimate the materials properties and conduct a slack fiber analysis. Cyclic tests were conducted at strain rates varying from 0.03 to 0.07. The lower end of the cyclic tests was 0.1 times the maximum. Additionally, multi-part tests were conducted. This involved conducting a cyclic test for a certain number of cycles followed by a tensile test to failure. These included both strain-based and force-based cyclic tests. The residual material characteristics were then mathematically modeled in order to predict the fatigue model.
[A, Approved For Public Release]