Evaluation of the dynamic fracture characteristics of shaped-charge jets at different strain-rates and known initial LINER and EXPLOSIVE MICROSTRUCTURES

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dc.contributor.advisorMostert, F. J.en_ZA
dc.contributor.advisorRohwer, Erich G.en_ZA
dc.contributor.authorMajiet, Fakhreeen_ZA
dc.contributor.otherStellenbosch University. Faculty of Science. Dept. of Physics.en_ZA
dc.date.accessioned2020-11-16T06:23:27Z
dc.date.accessioned2021-01-31T19:39:24Z
dc.date.available2020-11-16T06:23:27Z
dc.date.available2021-01-31T19:39:24Z
dc.date.issued2020-12
dc.descriptionThesis (PhD)--Stellenbosch University, 2020.en_ZA
dc.description.abstractENGLISH ABSTRACT: In the pursuit of continuous improvement within the realm of shaped-charge design, it is the objective of the design to ultimately delay the break-up-time of the produced jets and hence improve the penetration performance. This research was focused purely on the fracture dynamics of particular jets by monitoring numerous design variables. The design variables varied were carefully selected, namely the initiation system, the explosive type, explosive crystal size and the liner angle. These variables were varied such that the tip velocities of the jets decreased linearly from design 1 to design 6. This research employed the ANSYS AUTODYN finite difference code to model the behaviour of the shaped-charges in the stages of liner collapse and jet formation. The design parameters were studied quantitatively to identify the effect of each individual parameter on the jet characteristics. All the AUTODYN analyses were validated by means of flash X-ray analysis for all six designs. The experimental phase of this research project was extensive, quantifying numerous aspects of shape charge design. The data from each experiment was digitally analysed with a sophisticated locally developed software package. The experimental break-up-times were also compared to the break-up-times predicted by a number of widely used analytical models of which one was found to fit the data optimally. The main conclusion of this research was established due to the special care in the manufacture of the respective warheads based on six designs. Experimental evidence is presented in support of a parameter, different to the break-up time, to quantify the plasticity of shaped charge jets.en_ZA
dc.description.abstractAFRIKAANSE OPSOMMING: Geen Afrikaanse opsomming beskikbaar nie.af_ZA
dc.description.versionDoctoralen_ZA
dc.format.extentxxix, 196 pages : illustrationsen_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/109199
dc.language.isoen_ZAen_ZA
dc.publisherStellenbosch : Stellenbosch Universityen_ZA
dc.rights.holderStellenbosch Universityen_ZA
dc.subjectShape-charge jets -- Fracture mechanicsen_ZA
dc.subjectShaped charges -- Design and constructionen_ZA
dc.subjectFracture mechanics -- Simulationen_ZA
dc.subjectMicrostructureen_ZA
dc.subjectUCTD
dc.titleEvaluation of the dynamic fracture characteristics of shaped-charge jets at different strain-rates and known initial LINER and EXPLOSIVE MICROSTRUCTURESen_ZA
dc.typeThesisen_ZA
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