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Optimal wave propagation-based nondestructive test design for quantitative damage characterization

Zhanpeng, Hao (2014) Optimal wave propagation-based nondestructive test design for quantitative damage characterization. Master's Thesis, University of Pittsburgh. (Unpublished)

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Nondestructive testing (NDT) has been widely used for damage identification and inverse characterization of material properties in several fields of science and engineering, from structural engineering to medicine. However, there are several common challenges inherent in the evaluation of structures and systems, including the potential for excessive computational expense and ill-posedness of the inverse problem. Numerical methods, such as the finite element method, provide substantial benefits in terms of solution capabilities, but the analysis for NDT applications in realistic structures often requires substantial computational time and power. Furthermore, limitations on the quantity and quality of measurement data can cause the evaluation problem to require even more computational effort and/or lead to solution non-uniqueness or nonexistence.

The present work introduces a general approach to optimal wave propagation-based NDT design for damage characterization applications. More specifically, the objective of this work is to improve the accuracy and efficiency of the damage characterization process by optimizing the parameters of the NDT such as the locations of sensors and actuators. The NDT design approach developed is based on maximizing the sensitivity of the NDT response measurements to changes in the material properties to be determined by the evaluation, while simultaneously minimizing the redundancy of response measurements. Two simulated case studies are presented to evaluate the performance of the optimal wave propagation-based NDT design approach. Both examples consisted of thin plate structures with a damage field that was represented by changes in the Young's modulus distribution throughout the structure. In order to provide practical relevance, the NDT method considered was based on commonly used ultrasonic testing with piezoelectric sensors and actuators. The optimal NDT designs corresponding to maximized sensitivity and minimized response redundancy are shown to provide substantially improved evaluation solution efficiency and accuracy for quantitative damage characterization in comparison to standard approaches.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairBrigham, Johnbrigham@pitt.eduBRIGHAM
Committee MemberYu, QiangQIY15@pitt.eduQIY15
Committee MemberLin, Jeen Shangjslin@pitt.eduJSLIN
Thesis AdvisorBrigham, Johnbrigham@pitt.eduBRIGHAM
Date: 16 June 2014
Date Type: Publication
Defense Date: 31 March 2014
Approval Date: 16 June 2014
Submission Date: 7 April 2014
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 70
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Civil and Environmental Engineering
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Nondestructive Test, Inverse Problem, Ultrasonic Testing, Optimization Sensor Actuator
Date Deposited: 16 Jun 2014 17:30
Last Modified: 15 Nov 2016 14:18

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