A COMPARISON OF DUCTILE AND BRITTLE MATERIAL FAIL CHARACTERISTICS IN RESPONSE TO TENSILE AND CYCLIC LOADING
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Authors
Markoff, Emma K.
Subjects
composite materials
glass fiber
cyclic loading
tensile loading
linear-plastic
non-linear elastic
aluminum 5000 series
notch
crack
glass fiber
cyclic loading
tensile loading
linear-plastic
non-linear elastic
aluminum 5000 series
notch
crack
Advisors
Kwon, Young W.
Date of Issue
2022-12
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
Understanding when a material will fail is of utmost importance to the military. Fail characteristics of emerging materials like composites are not well known. Additionally, the understanding of how composites compare to a material like aluminum is of interest when one material type is preferred over another. The main effort of this study is to analyze the behavior of linear-elastic materials compared to nonlinear elastic/plastic when put under tensile and cyclic loads. This research specifically looks at glass fiber composites (GFC) in comparison to aluminum 5000 series material to better understand their strength degradation due to tensile loading and fatigue loading. Using the INSTRON 5892, aluminum and GFC were put under tensile load with varying notch sizes until failure. Stress-strain curves were established to compare maximum stress. The MTS 858 was then used to put unidirectional GFC under cyclic load; an S-N curve was then established and compared to prior research of GFC. This research is building universal criteria that will hopefully one day be useful in predicting failure for any material under any load. Composite material provides an alternative to commonly used materials, particularly metals, and may be advantageous to the Navy in future development of aircraft and ship design.
Type
Thesis
Description
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Identifiers
NPS Report Number
Sponsors
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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.