Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Mechanical Engineering | en_US |
| dc.creator | Ng, Yin-fun | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/1958 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | - |
| dc.rights | All rights reserved | en_US |
| dc.title | Mechanical behaviour of composite spring with embedded shape memory alloy | en_US |
| dcterms.abstract | Closed-form solutions from complementary strain energy are derived for the spring stiffnesses of circular mid-surface symmetric composite and composite/shape memory alloy springs under uniaxial line loading. A three dimensional finite element model is established to investigate the mechanical behaviours of the springs. Homogenization technique and rule of mixtures are employed to evaluate material properties of the shape memory alloy wire/epoxy layers. The methods for determining the mechanical properties of the shape memory alloy wire/epoxy layers are discussed. Quasi-static compressive tests are performed to determine the spring stiffnesses of the springs at three temperatures. Satisfactory correlation between the predicted and experimental results is obtained. The effects of temperature and compressive Young's moudus of the E-glass fibre/epoxy composite on the spring stiffness of the springs are presented. Design charts have been created, the relationship between the spring stiffnesses and the geometric parameters of the springs are discussed. Modal tests are carried out to evaluate the damping ratio and fundamental natural frequency of these springs at various temperatures. A finite element model is built to study the effect of temperature to the dynamics behaviour of these springs and compared with experiment. Correlation curves of spring stiffnesses and the fundamental natural frequency-to-temperature ratio of the springs are established and good correlations are observed. | en_US |
| dcterms.extent | 1 v. (various pagings) : ill. (some col.) ; 30 cm | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2003 | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.educationalLevel | M.Phil. | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.LCSH | Springs (Mechanism) | en_US |
| dcterms.LCSH | Shape memory alloys | en_US |
| dcterms.accessRights | open access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b17146884.pdf | For All Users | 7.87 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/200/1958