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Development of an intermediate strain rate compression testing machine
Includes bibliographical references.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Mechanical Engineering
2014
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| _version_ | 1867613213999235072 |
|---|---|
| access_status_str | Open Access |
| author | Stander, Melchior |
| author2 | Cloete, T J |
| author_browse | Cloete, T J Stander, Melchior |
| author_facet | Cloete, T J Stander, Melchior |
| author_sort | Stander, Melchior |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/9131 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:34.479Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Department of Mechanical Engineering |
| publisherStr | Department of Mechanical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/9131 Development of an intermediate strain rate compression testing machine Stander, Melchior Cloete, T J Includes bibliographical references. The further development of the wedge bar Intermediate Strain rate Tester (IST) presented by Cloete and Oxtoby [1] is presented in this dissertation. The concept uses a wedge mechanism to deform 5 mm diameter, 5 mm long specimens at strain rates in the region of 10 s, up to strains of 30. As impact principles are used to start and stop the experiment, it takes less than 1 of the testing duration to reach testing speed and to stop the experiment. The kinetic energy stored in the wedge bar helps ensure a near constant loading rate over the duration of the experiment. The yield stress is captured at above 80 of the average strain rate for the experiment for most of the materials investigated. The design work focuses primarily around the design of the new load-frame, load-cell, loading platforms and wedge bar displacement sensor. Finite Element Analysis (FEA) was used to investigate the dynamic response of the IST and modify the design of components where necessary. The modifications made the load-frame and load-cell result in a significant improvement in the quality of the measured signals. The wedge bar displacement sensor performed well. The back pressure driven loading concept shows potential but needs more development before it is suitable for routine testing. A range of common engineering materials was tested at quasi static, intermediate and high strain rates and compared to the results found in the literature. The results match well, however, friction effects dominate the large strain response of the metal specimens. In its current configuration the IST is used effective for testing polymers up to large strains as well as yield stress and small strain measurement of metals. For materials for which specimen friction effects are a problem, interrupted tests can be used to extend the maximum strain achievable. 2014-11-05T03:50:06Z 2014-11-05T03:50:06Z 2014 Master Thesis Masters MSc http://hdl.handle.net/11427/9131 eng application/pdf Department of Mechanical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Stander, Melchior Development of an intermediate strain rate compression testing machine |
| thesis_degree_str | Master's |
| title | Development of an intermediate strain rate compression testing machine |
| title_full | Development of an intermediate strain rate compression testing machine |
| title_fullStr | Development of an intermediate strain rate compression testing machine |
| title_full_unstemmed | Development of an intermediate strain rate compression testing machine |
| title_short | Development of an intermediate strain rate compression testing machine |
| title_sort | development of an intermediate strain rate compression testing machine |
| url | http://hdl.handle.net/11427/9131 |
| work_keys_str_mv | AT standermelchior developmentofanintermediatestrainratecompressiontestingmachine |