Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Calibration of a discrete element model of Fackler gelatine for spherical projectile penetration
Thesis (MEng)--Stellenbosch University, 2023.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | en_ZA en_ZA |
| Published: |
Stellenbosch : Stellenbosch University
2023
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613925849169920 |
|---|---|
| access_status_str | Open Access |
| author | Grobbelaar, H. C. |
| author2 | Els, D. N. J. |
| author_browse | Els, D. N. J. Grobbelaar, H. C. |
| author_facet | Els, D. N. J. Grobbelaar, H. C. |
| author_sort | Grobbelaar, H. C. |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 2023. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/127280 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA en_ZA |
| last_indexed | 2026-06-10T12:43:54.041Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/127280 Calibration of a discrete element model of Fackler gelatine for spherical projectile penetration Grobbelaar, H. C. Els, D. N. J. Coetzee, C. J. Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. Computational fluid dynamics Finite element method Discrete element method Ballistics Muscles -- Calibration Thesis (MEng)--Stellenbosch University, 2023. ENGLISH ABSTRACT: In the field of terminal ballistics, it is often required to conduct experiments on muscle tissue to better understand its response to mechanical disturbances. In some studies, these experiments were conducted on muscle tissue taken from cadavers or sedated animals. These tests are often accompanied by large costs and often require ethical clearance. To avoid this, studies have progressed to using tissue surrogates such as soaps or gels which have similar material properties to human muscle tissue. One such surrogate is Fackler gelatine which has been widely used due to its similarities to human and animal muscle tissue and its transparency, which makes it easy to track projectile motion. Numerical modeling formulations could prove to be a powerful tool for studies involving human tissue because the use of these numerical tools eliminates the need for ethical clearance and can save time and money usually spent on physical experiments. One such tool is the Discrete Element Method. In this study, a series of experiments were conducted on Fackler gelatine to determine the required material properties which were then used to calibrate a Discrete Element Model of Fackler gelatine. A bond model was used to bond particles together and the bond model normal stiffness equation was altered to incorporate a viscous term and a strain-dependent term. The model was validated by firing a 11mm spherical projectile at 62.3m/s, a 12.1mm projectile at 78.2m/s, and a 12.3mm projectile at 129.8 into Fackler gelatine and comparing the measured results to the simulation results. AFRIKAANS OPSOMMING: Op die gebied van terminale ballistiek is dit dikwels nodig om eksperimente op spierweefsel uit te voer om die reaksie op meganiese steurnisse beter te verstaan. In sommige studies is hierdie eksperimente uitgevoer op spierweefsel wat van kadavers of verdoofde diere geneem is. Hierdie toetse gaan dikwels gepaard met groot koste en vereis dikwels etiese goedkeuring. Om dit te vermy, het studies gevorder tot die gebruik van weefsel surrogate soos seep of gels wat soortgelyke materiële eienskappe as menslike spierweefsel het. Een so ’n surrogaat is Fackler-gelatien wat wyd gebruik word as gevolg van sy ooreenkomste met menslike spierweefsel en die deursigtigheid daarvan, wat dit maklik maak om projektielbeweging war te neem. Numeriese modelleringsformulerings kan ’n kragtige hulpmiddel wees vir studies wat menslike weefsel behels, omdat die gebruik van hierdie numeriese instrumente die behoefte aan etiese goedkeuring uitskakel en tyd en geld bespaar kan word wat gewoonlik aan fisiese eksperimente bestee word. Een so ’n instrument is die Diskrete Element Metode. In hierdie studie is ’n reeks eksperimente op Fackler-gelatien uitgevoer om die vereiste materiaaleienskappe te bepaal wat dan gebruik is om ’n diskrete elementmodel van Fackler-gelatien te kalibreer. ’n Bindingsmodel is gebruik om partikels aan mekaar te bind en die bindingsmodel se normale styfheidsvergelyking is verander om ’n viskose term en ’n spanning verharding term in te sluit. Die model is bekragtig deur ’n 11mm sferiese projektiel af te vuur teen 62.3m/s, ’n 12.1mm projektiel af te vuur teen 78.2m/s, en ’n 12.3mm projektiel af te vuur teen 129.8 in Fackler gelatien in en die gemete resultate met die simulasie resultate te vergelyk . Masters 2023-03-02T09:00:22Z 2023-05-18T07:13:47Z 2023-03-02T09:00:22Z 2023-05-18T07:13:47Z 2023-03 Thesis http://hdl.handle.net/10019.1/127280 en_ZA en_ZA Stellenbosch University ix, 93 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Computational fluid dynamics Finite element method Discrete element method Ballistics Muscles -- Calibration Grobbelaar, H. C. Calibration of a discrete element model of Fackler gelatine for spherical projectile penetration |
| title | Calibration of a discrete element model of Fackler gelatine for spherical projectile penetration |
| title_full | Calibration of a discrete element model of Fackler gelatine for spherical projectile penetration |
| title_fullStr | Calibration of a discrete element model of Fackler gelatine for spherical projectile penetration |
| title_full_unstemmed | Calibration of a discrete element model of Fackler gelatine for spherical projectile penetration |
| title_short | Calibration of a discrete element model of Fackler gelatine for spherical projectile penetration |
| title_sort | calibration of a discrete element model of fackler gelatine for spherical projectile penetration |
| topic | Computational fluid dynamics Finite element method Discrete element method Ballistics Muscles -- Calibration |
| url | http://hdl.handle.net/10019.1/127280 |
| work_keys_str_mv | AT grobbelaarhc calibrationofadiscreteelementmodeloffacklergelatineforsphericalprojectilepenetration |