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Permanent link (DOI): https://doi.org/10.7939/R3N873D2R

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Dynamic behaviour of piezoelectric sensors and their application in crack identification for SHM Open Access

Descriptions

Other title
Subject/Keyword
crack identification
multiple scattering
dynamic interaction
piezoelectric sensor
structural health monitoring
dispersion relation
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Yu, Huangchao
Supervisor and department
Wang, Xiaodong (Mechanical Engineering)
Examining committee member and department
Chen, Zengtao (Mechanical Engineering)
Tian, Zhigang (Mechanical Engineering)
Zhu, George (York University)
Wang, Xiaodong (Mechanical Engineering)
Raboud, Don (Mechanical Engineering)
Bindiganavile, Vivek (Civil and Environmental Engineering )
Department
Department of Mechanical Engineering
Specialization

Date accepted
2017-06-01T13:42:54Z
Graduation date
2017-11:Fall 2017
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
The health monitoring of critical structures plays a crucial role in locating damage positions timely and preventing catastrophic failures. Much attention has been devoted to exploiting piezoelectric sensors/actuators to develop techniques of recording elastic wave signals to realize structural health monitoring (SHM). This thesis is to conduct a systematic investigation of the dynamic behaviour of piezoelectric sensors and their application in quantitative crack identification in SHM systems. A typical SHM system contains piezoelectric sensors bonded to a host structure to be monitored. This structure is subjected to a dynamic excitation which will induce elastic wave propagation in it. When the wave encounters cracks, it will be scattered and the scattered wave will be recorded by the piezoelectric sensors. The recorded signals contain the information of the cracks thus can be used to identify the parameters of the cracks. In this study, theoretical modelling and simulation are conducted to investigate the load transfer between the sensor and the host structure, the dispersion relation of wave propagation, and the multiple scattering of elastic waves. In addition, a crack identification technique is investigated using the voltage signals based on optimization method. Four aspects of the work were accordingly studied and examined. Firstly, a new model is developed for surface-bonded piezoelectric thin-sheets with bending effect. The coupled electromechanical behaviour and the effect of bending upon load transfer and local stress field are studied. Secondly, a new analytical treatment is provided for wave propagation in layered piezoelectric structures, including dispersion characteristics and harmonic wave propagation. The two lowest wave modes of the guided wave in such structures are analyzed. Thirdly, a new semi-analytical solution is determined for the complicated dynamic interaction between piezoelectric sensors and cracks using pseudo incident wave method and superposition. This method has the advantages of the reliability of analytical solutions and the flexibility of typical numerical methods, and finds explicit relations between the voltage output of the piezoelectric sensor and the crack parameters. Inversely, by integrating this relation and known voltage data into an optimization process, a novel crack identification technique is established. This technique quantitatively identifies the position, the length and the orientation of typically embedded cracks effectively. The methods proposed in this thesis can be used to understand the dynamic behaviour of piezoelectric based SHM systems, multiple scattering of elastic waves and provide insights into developing new methods for quantitative crack identification.
Language
English
DOI
doi:10.7939/R3N873D2R
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
5. Huangchao Yu and Xiaodong Wang, 2016. Modelling and simulation of surface-bonded piezoelectric actuators with bending effects. Journal Intelligent Material Systems and Structures, 28(4), 507–520. doi: 10.1177/1045389X16649701Huangchao Yu and Xiaodong Wang, The coupled dynamic behaviour of layered piezoelectric structures, 24th International congress of theoretical and applied mechanics. August 21-26, 2016, Montreal, CanadaXiaodong Wang, Huangchao Yu, Abdel-Gawad S. and Chen Wang, On the pseudo-incident wave technique for interacting inhomogeneities in electromechanical problems, 6th International Conference on Computational Methods for Coupled Problems in Science and Engineering, May 18-20, 2015, Venice, Italy, 440-451Huangchao Yu and Xiaodong Wang, Dispersion characteristics of wave propagation in a piezoelectric coupled solid structure, CSME International Congress 2014. June 1-4, 2014, Toronto, CanadaJikai Liu, Huangchao Yu, Yongsheng Ma, 2016, Minimum void length scale control in level set topology optimization subject to machining radii, Computer-aided Design 81, 70–80. DOI: 10.1016/j.cad.2016.09.007

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