Failure site location by acoustic emission for composites reliability assurance

Loading...
Thumbnail Image
Authors
Gish, Donald A.
Subjects
Advisors
Wu, Edward M.
Date of Issue
1995-09
Date
September 1995
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The failure of fiber filaments in a composite subjected to load produces a stress wave which can be detected using acoustic emission techniques. The spatial clustering of multiple fiber failure sites is known to cause catastrophic failure of the macro composite. Acoustic emission can be used to determine locations of these flaws, providing a useful tool for reliability assurance of composite structures. This investigation establishes the necessary foundation by categorically quantifying the methodology of determining flaw locations in a one dimensional solid. Homogeneous isotropic (steel) thin rods are subjected to repeatable wave events to quantify distance measurement, resolution and repeatability. This experimentation is then extended to a unidirectional carbon fiber composite rod with further investigation to quantify effects of dispersion and damping in this heterogeneous, anisotropic material.
Type
Thesis
Description
Series/Report No
Department
Aeronautical Engineering
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
65 p.
Citation
Distribution Statement
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.
Collections