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Development of non-destructive damage detection approach using vibrational power flow

Development of non-destructive damage detection approach using vibrational power flow
Development of non-destructive damage detection approach using vibrational power flow
Catastrophic structural failures are very harmful to humans’ lives. Theses failures can be created by minor damages, such as cracks, which can be propagated due to external loading and lead to the loss of structural integrity and stability. It is, therefore, worthwhile to have a reliable non-destructive damage detection (NDD) technique capable of detecting early-age damages on structures. Once the damages are discovered, repair or replacement can be made before their enlargement.

In this thesis, investigations of the power flow in the plates containing single open crack are firstly performed. It is shown that the pattern and magnitude of the power flow are significantly changed only at the crack location. This trend also happens in the cases of the double- and triple-cracked plates. An NDD technique for plate structures based on these local changes of the power flow due to damages is introduced. The technique can effectively reveal damage location and severity using three power flow data measured from the tested plate as inputs for the reverse step.

The characteristics of the nonlinear power flow induced by single and multiple breathing fatigue cracks on the cracked cantilever beam, namely super-harmonic resonance, are studied. The degree of nonlinearity of the power flow is shown to be dependent on the crack location, crack severity and amount of crack on the beam. This degree is used in conjunction with the surface fitting to determine the approximate location and severity of a crack on the beam. An NDD technique that can detect multiple-cracked cantilever beams is also proposed. This technique employs the power flow damage indices (DIs) obtained from the time-domain power flow plot to pinpoint the crack locations. The application capabilities of above three NDD techniques are presented through several numerical case studies. Effects of noise on each technique are also discussed.
University of Southampton
Boonpratpai, Ponprot
eaff884e-61da-4453-9252-b49e1fc13ce2
Boonpratpai, Ponprot
eaff884e-61da-4453-9252-b49e1fc13ce2
Xiong, Yeping
51be8714-186e-4d2f-8e03-f44c428a4a49
Chen, Zhi-Men
ac1e6e06-1666-4975-9bba-751f4a0016df

Boonpratpai, Ponprot (2017) Development of non-destructive damage detection approach using vibrational power flow. University of Southampton, Doctoral Thesis, 255pp.

Record type: Thesis (Doctoral)

Abstract

Catastrophic structural failures are very harmful to humans’ lives. Theses failures can be created by minor damages, such as cracks, which can be propagated due to external loading and lead to the loss of structural integrity and stability. It is, therefore, worthwhile to have a reliable non-destructive damage detection (NDD) technique capable of detecting early-age damages on structures. Once the damages are discovered, repair or replacement can be made before their enlargement.

In this thesis, investigations of the power flow in the plates containing single open crack are firstly performed. It is shown that the pattern and magnitude of the power flow are significantly changed only at the crack location. This trend also happens in the cases of the double- and triple-cracked plates. An NDD technique for plate structures based on these local changes of the power flow due to damages is introduced. The technique can effectively reveal damage location and severity using three power flow data measured from the tested plate as inputs for the reverse step.

The characteristics of the nonlinear power flow induced by single and multiple breathing fatigue cracks on the cracked cantilever beam, namely super-harmonic resonance, are studied. The degree of nonlinearity of the power flow is shown to be dependent on the crack location, crack severity and amount of crack on the beam. This degree is used in conjunction with the surface fitting to determine the approximate location and severity of a crack on the beam. An NDD technique that can detect multiple-cracked cantilever beams is also proposed. This technique employs the power flow damage indices (DIs) obtained from the time-domain power flow plot to pinpoint the crack locations. The application capabilities of above three NDD techniques are presented through several numerical case studies. Effects of noise on each technique are also discussed.

Text
FINAL Thesis for EPRINTS _Ponprot - Version of Record
Restricted to Repository staff only until 15 September 2020.
Available under License University of Southampton Thesis Licence.

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Published date: March 2017

Identifiers

Local EPrints ID: 416113
URI: https://eprints.soton.ac.uk/id/eprint/416113
PURE UUID: 307876d4-6356-4256-9b1d-3e549bb469f1
ORCID for Yeping Xiong: ORCID iD orcid.org/0000-0002-0135-8464

Catalogue record

Date deposited: 04 Dec 2017 17:30
Last modified: 14 Mar 2019 01:47

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Contributors

Author: Ponprot Boonpratpai
Thesis advisor: Yeping Xiong ORCID iD
Thesis advisor: Zhi-Men Chen

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