Transient dynamic response and failure of composite structure under cyclic loading with fluid structure interaction
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Authors
Teo, Hui Fen
Subjects
fluid structure interaction
composite structures shipbuilding
fatigue loading
composite structures shipbuilding
fatigue loading
Advisors
Kwon, Young
Date of Issue
2014-09
Date
Sep-14
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
With the growing interest in using composites in naval shipbuilding, it is crucial to understand the behavior of structures, especially the Fluid Structural Interaction (FSI) aspect of the composites under dynamic loading, to ensure the survivability of the platform at sea. The objective of this study is to perform displacement-controlled fatigue cyclic loading on quasi-isotropic E-glass laminate, which is commonly used in the shipbuilding industry. The fatigue cyclic loading is performed in both air and water environments with varied frequencies to analyze the structural behavior and failure pattern of composites under FSI. The results of the experiment show significant FSI effects on the fatigue failure life cycle of the composite under high frequency loading of 2 Hz, 5 Hz and 10 Hz. The degree of FSI effect of the 5 Hz and 10 Hz cyclic loading is significantly higher than 2 Hz cyclic loading and the FSI effect varies for 5 Hz and 10 Hz, with 5 Hz loading exhibiting a higher impact on the composite. The knowledge gained from the investigation will benefit ongoing research into understanding the dynamic response and failure mechanism of the composite structures under FSI. The insights and suggestions for follow-on studies will contribute to the development of future life prediction modeling or tools that will help to prevent premature failures in the design of composite vessel—particularly a naval ship—where survivability is vital.
Type
Thesis
Description
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Identifiers
NPS Report Number
Sponsors
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Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.