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Hyperelastic and viscoelastic characterization and modelling of silicone rubber
Malatsi, K. D. 2025. Hyperelastic and Viscoelastic Characterization and Modelling of Silicone Rubber. Unpublished masters thesis. Stellenbosch: Stellenbosch University [online]. Available: https://scholar.sun.ac.za/items/d45f7696-5eea-44b5-91ce-ac764113ca41
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Stellenbosch : Stellenbosch University
2025
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| _version_ | 1867614082209677312 |
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| access_status_str | Open Access |
| author | Malatsi, Kamogelo Desire |
| author2 | Venter, Gerhard |
| author_browse | Malatsi, Kamogelo Desire Venter, Gerhard |
| author_facet | Venter, Gerhard Malatsi, Kamogelo Desire |
| author_sort | Malatsi, Kamogelo Desire |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Malatsi, K. D. 2025. Hyperelastic and Viscoelastic Characterization and Modelling of Silicone Rubber. Unpublished masters thesis. Stellenbosch: Stellenbosch University [online]. Available: https://scholar.sun.ac.za/items/d45f7696-5eea-44b5-91ce-ac764113ca41 |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/132644 |
| institution | Stellenbosch University (South Africa) |
| last_indexed | 2026-06-10T12:46:22.874Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/132644 Hyperelastic and viscoelastic characterization and modelling of silicone rubber Malatsi, Kamogelo Desire Venter, Gerhard Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. Silicone rubber -- Mechanical properties Viscoelastic materials Finite element method Materials -- Testing UCTD Malatsi, K. D. 2025. Hyperelastic and Viscoelastic Characterization and Modelling of Silicone Rubber. Unpublished masters thesis. Stellenbosch: Stellenbosch University [online]. Available: https://scholar.sun.ac.za/items/d45f7696-5eea-44b5-91ce-ac764113ca41 Thesis (MEng)--Stellenbosch University, 2025. ENGLISH ABSTRACT: Rubber is a unique material due to its elastic and viscous properties. It is widely used in a variety of engineering applications in the automotive, construction, and industrial sectors. For example in the mining industry, during start-up and shutdown, vibrating screens often operate at frequencies higher than their natural frequencies before stabilizing at the normal operating frequency. These excessive vibrations can cause damage to the machine and shorten its lifespan. Therefore, it is crucial to implement isolators that can dampen these large vibrations. By understanding the material properties of isolators, they can be designed with specific characteristics to reduce the risk of machine damage. This study proposes a hyper-viscoelastic model to describe the mechanical behaviour of silicone rubber. The hyperelastic behaviour of silicone rubber is modelled using the three-parameter Mooney-Rivlin model, with the hyperelastic parameters determined through inverse Finite Element (FE) modelling based on experimental indentation with Digital Image Correlation (DIC) data collection. The time-dependent characteristics of the silicone rubber are captured using a four-parameter Generalized Maxwell (GM) model, with viscoelastic material parameters obtained through a least-squares fit of experimental stress relaxation data. The material characterization is validated by physical testing and compared with FE model results. The results reveal that the viscoelastic effects have a significant impact on the dynamic behaviour of the silicone rubber and the material characterization is valid up to certain frequencies. AFRIKAANSE OPSOMMING: Rubber is ’n unieke materiaal weens sy elastiese en viskeuse eienskappe. Dit word wyd gebruik in ’n verskeidenheid van ingenieurstoepassings in die motor-, konstruksie- en industriële sektore. Byvoorbeeld, in die mynboubedryf, tydens aan en afskakeling, werk vibrerende siwwe dikwels teen frekwensies wat hoër is as hul natuurlike frekwensies voordat dit stabiliseer by die normale werksfrekwensie. Hierdie oormatige vibrasies kan skade aan die masjien veroorsaak en sy lewensduur verkort. Daarom is dit van kardinale belang om isolators te implementeer wat hierdie groot vibrasies kan demp. Deur die material eienskappe van isolators te verstaan, kan hulle ontwerp word met spesifieke eienskappe om die risiko van masjinskade te verminder. Hierdie studie stel ’n hiper-viskoelastiese model voor om die meganiese gedrag van silikoonrubber te beskryf. Die hiperelastiese gedrag van silikoonrubber word gemodelleer met behulp van die drie-parameter Mooney-Rivlin, model met die hiperelastiese parameters wat deur omgekeerde Eindige Element (EE) modellering bepaal word op grond van eksperimentele indrukking met Digitale Beeld Korelasie "Digital Image Correlation"(DIC) data-insameling. Die tydsafhanklike eienskappe van die silikoonrubber word vasgevang met ’n vier-parameter algemene Maxwell (GM) model, met viskoelastiese material eienskappe wat eksperimenteel verkry word deur ’n kurwepassing van die geleidelike afname in die interne spanning (binne die materiaal) wanneer dit onder konstante vervorming of rek gehou word vir ’n spesifieke tydsduur. Die materiaal karakterisering word gevalideer deur fisiese toetse en vergelyk met EE-modelresultate. Die resultate toon dat die viskoelastiese effekte ’n beduidende impak op die dinamiese gedrag van die silikoonrubber het, en die materiaal-karakterisering is geldig tot by sekere frekwensies. Masters 2025-06-12T08:14:10Z 2025-06-12T08:14:10Z 2025-03 Thesis https://scholar.sun.ac.za/handle/10019.1/132644 Stellenbosch University x, 99 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Silicone rubber -- Mechanical properties Viscoelastic materials Finite element method Materials -- Testing UCTD Malatsi, Kamogelo Desire Hyperelastic and viscoelastic characterization and modelling of silicone rubber |
| title | Hyperelastic and viscoelastic characterization and modelling of silicone rubber |
| title_full | Hyperelastic and viscoelastic characterization and modelling of silicone rubber |
| title_fullStr | Hyperelastic and viscoelastic characterization and modelling of silicone rubber |
| title_full_unstemmed | Hyperelastic and viscoelastic characterization and modelling of silicone rubber |
| title_short | Hyperelastic and viscoelastic characterization and modelling of silicone rubber |
| title_sort | hyperelastic and viscoelastic characterization and modelling of silicone rubber |
| topic | Silicone rubber -- Mechanical properties Viscoelastic materials Finite element method Materials -- Testing UCTD |
| url | https://scholar.sun.ac.za/handle/10019.1/132644 |
| work_keys_str_mv | AT malatsikamogelodesire hyperelasticandviscoelasticcharacterizationandmodellingofsiliconerubber |