Electronic Theses and Dissertations

Identifier

436

Date

2011

Document Type

Thesis

Degree Name

Master of Science

Major

Mechanical Engineering

Committee Member

Gang Qi

Committee Member

Gladius Lewis

Committee Member

John Hochstein

Abstract

Two of the major obstacles that limit the applications of the acoustic emission (AE) technique from being more acceptable for material characterization are: 1) difficulty of finding an efficient method to evaluate AE measurements when there are incomplete signals; and 2) poor repeatability and reproducibility of AE results. This thesis contains two manuscripts to address these problems. The first one is aimed at studying the consequence of incompleteness of AE signals, and our results suggest that the information entropy method is able to minimize inconsistent results caused by the incompleteness. The second one is aimed at studying the reproducibility of AE measurements, and the results suggest that our method is able to reduce the influence of irreproducible on the AE measurements. The reason that our method has such an advantage to deal with the problems mention above is summarized: the information entropy method can consider correlated relationships between the inherent multi-scale damage existing in a solid.

Comments

Data is provided by the student.

Library Comment

Dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.

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