Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Faculty of Engineering | en_US |
| dc.creator | Wang, Binghan | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/7500 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | - |
| dc.rights | All rights reserved | en_US |
| dc.title | Evaluation of fatigue damage in bolted structures using nonlinearities of lamb waves | en_US |
| dcterms.abstract | Steel bolted connections are widely used in various industrial sectors. Different loading conditions of the connections can result in stress concentration at fasten holes, which may lead to the deterioration of fatigue damages, such phenomenon makes it significant to detect the damage nearby the bolts. Linear ultrasonic methods are currently the main methods in Non-Destructive ultrasonic detection but they may lose their effectiveness to the detection of fatigue damage. On the other hand, the nonlinear guided waves are sensitive to small-scale damage. In this project, the principle of nonlinear lamb waves for detection of fatigue damage was introduced first, which was used to detect the presence of the small-scale fatigue damage. Two rows of transducers were used to generate and detect the fundamental and second harmonic Lamb waves. A probability-based imaging algorithm was further presented and used to locate the fatigue damage. The approach was verified experimentally by evaluating fatigue damage in aluminum plate with "W-shape" bolt holes, successfully detected and located fatigue area with good accuracy. Compared with current linear ultrasonic methods, this approach is more sensitive to small-scale fatigue damage and is independent of benchmark. | en_US |
| dcterms.extent | xi, 72 leaves : ill. (some col.) ; 30 cm. | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2014 | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.educationalLevel | M.Sc. | en_US |
| dcterms.LCSH | Steel, Structural -- Testing. | en_US |
| dcterms.LCSH | Bolts and nuts -- Testing. | en_US |
| dcterms.LCSH | Lamb waves. | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b27489632.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.89 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/7500