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An investigation into the effects of resonant acoustic mixing on energetic materials

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Title: An investigation into the effects of resonant acoustic mixing on energetic materials
Authors: Homan, Jordan
Item Type: Thesis or dissertation
Abstract: Energetic materials are highly complicated composite materials, designed to produce tailored outputs. A large part of their behaviour depends on the sample being a homogeneous material. As such, the processing of energetic materials is critical to optimise performance. Traditional methods are based around intrusive blade mixers, which take time, and due to safety considerations, do not necessarily produce a consistent material. Resonant acoustic mixing (RAM) is a novel non-intrusive technique which propagates acoustic vibrations into a sealed sample vessel. It is more efficient in both time and material, and opens up avenues for mixing novel materials. This programme is a comparative study designed to determine if RAM impacts energetic materials in comparison to a planetary mixed baseline. Starting with two-phase inert composites the composition was scaled up to a mimic PBX and then to a live PBX. A variation of characterisation was conducted; mechanical testing was conducted via dynamic mechanical analysis, hardness testing and split Hopkinson pressure bar. Thermal characterisation was conducted by thermo mechanical analysis and differential scanning calorimetry/thermogravimetric analysis. Chemical analysis was conducted by nuclear magenetic resonance and density testing was conducted by pycnometry. In addition, hazard testing and functionality testing was conducted on the explosive samples. The research found that mixing via RAM did not impact the material; however, it also highlighted a potential limitation. Several of the RAM compositions demonstrated significantly weaker mechanical properties due to poor curing of the binder caused by inconsistent distribution of the isocyanate through the material.
Content Version: Open Access
Issue Date: Nov-2019
Date Awarded: Jul-2020
URI: http://hdl.handle.net/10044/1/95356
DOI: https://doi.org/10.25560/95356
Copyright Statement: Creative Commons Attribution NonCommercial Licence
Supervisor: Proud, William
Sponsor/Funder: Royal Commission of the Great Exhibition of 1851
Department: Physics
Publisher: Imperial College London
Qualification Level: Doctoral
Qualification Name: Doctor of Philosophy (PhD)
Appears in Collections:Physics PhD theses



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