Masters Theses
Abstract
"This thesis reviews a methodology for identifying damage in aluminum beams and plates. The presence of cracks in aluminum plate panels is detected using this methodology. Aluminum plates usually undergo fatigue cracks due to high stresses which in tum reduce the fatigue strength of the structure. These cracks can be of varying degree of intensity and can occur at one or more locations in the structure. Substructural health monitoring is a model-based method which utilizes the flexibility property of the structure to evaluate damage. Substructural health monitoring methodology has distinct advantage over other flexibility-based methods as it utilizes the local properties of the structure for damage identification and hence is chosen as a candidate method for damage detection. This methodology is used to detect damage at single and multiple locations in a beam and a plate. In this method, a structure is divided into substructures whose local and global properties are determined. Damage is detected based on relative changes in the localized flexibility properties of an undamaged and damaged· structure. These localized flexibility properties are obtained from the global and local properties of interest. Experimental analysis is done using a Scanning Doppler Laser Vibrometer to obtain the modal properties for both undamaged and damaged structures, which are essential for evaluating the localized flexibility properties of the structure. The analytical method involves employing finite element approximation (FEA) to obtain certain local properties. The effectiveness of this method in detecting damage has been verified by vibration testing aluminum plates and beams with damage and validating the results with the numerical results obtained from FEA"-- Abstract, p. iii
Advisor(s)
Rao, Vittal S.
Committee Member(s)
ChandraShekhara, K.
Krishnamurthy, K.
Department(s)
Mechanical and Aerospace Engineering
Degree Name
M.S. in Mechanical Engineering
Publisher
University of Missouri--Rolla
Publication Date
Fall 2003
Pagination
viii, 61 pages
Note about bibliography
Includes bibliographical references (pages 59-60)
Rights
© 2003 Sravan Prakash Mantha, All rights reserved.
Document Type
Thesis - Restricted Access
File Type
text
Language
English
Subject Headings
Aluminum -- Fatigue -- TestingFinite element method
Thesis Number
T 8664
Print OCLC #
62495542
Recommended Citation
Mantha, Sravan Prakash, "Substructural health monitoring methodology for damage detection in beam and plate structures" (2003). Masters Theses. 3702.
https://scholarsmine.mst.edu/masters_theses/3702
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