DSDS 22
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Browsing DSDS 22 by Subject "DSDS2022"
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Item Open Access Metals in extreme environments; Effect of multiple high velocity shots(Cranfield University, 2022-11-22T11:35:41Z) Stephenson, John-JosephDuring high strain rate scenarios such as an impact event, a compressive shock wave will propagate through the material. When this wave reaches a free surface, it will be reflected as a rarefaction wave. Interaction of these rarefaction waves can lead to localised tension developing in the material, leading to tensile failure, or spallation, which has been studied extensively over many years.What has been far less studied is the effect of a secondary compression on shock damaged material. This research will investigate this and determine if, and if so under what conditions, recompaction will occur in Aluminium and Titanium. This should provide fundamental knowledge of complex loading scenarios, aiding understanding of extreme events in both civil and military spheres. The work will involve the design of a passive' recovery system, which in addition to reducing the time required to produce samples for this work will have wider applications within the shock community.During high strain rate scenarios such as an impact event, a compressive shock wave will propagate through the material. When this wave reaches a free surface, it will be reflected as a rarefaction wave. Interaction of these rarefaction waves can lead to localised tension developing in the material, leading to tensile failure, or spallation, which has been studied extensively over many years. What has been far less studied is the effect of a secondary compression on shock damaged material. This research will investigate this and determine if, and if so under what conditions, recompaction will occur in Aluminium and Titanium. This should provide fundamental knowledge of complex loading scenarios, aiding understanding of extreme events in both civil and military spheres. The work will involve the design of a 'passive' recovery system, which in addition to reducing the time required to produce samples for this work will have wider applications within the shock community.Item Open Access Multistatic Synthetic Aperture Radar Phenomenology and Interferometry(Cranfield University, 2022-11-22T11:36:33Z) Hagelberg, AlexanderSynthetic Aperture Radar (SAR) is a remote sensing technique which provides high resolution imagery over large areas of the Earth. Unlike optical imagery, SAR operates in all-weathers, day or night. SAR images provide different information compared to electro-optical imagery and allows interferometry to be performed. Interferometry provides sensitive detection of ground height and of changes on the ground. This project investigates multistatic SAR geometries suitable to swarm radar platform concepts including SAR satellite constellations, as well as the processing of collected data.Item Open Access Nuclear Power: Finding the missing piece(Cranfield University, 2022-11-22T14:40:32Z) Mirza, MateenThere is now a clear consensus that our energy demands must be met through lower carbon solutions. As our global population continues to rise and aspires to higher living standards we are faced with increasingly ambitious energy targets in the transport, industry and power sectors. Nuclear power remains one of the few reliable energy sources. However, there remains a missing piece to the puzzle. Whether this relates to spent nuclear fuel reprocessing, the ongoing issue of waste disposal or improving our fleet of nuclear reactor systems is left to the viewer's thoughts.Item Open Access Until Sniffer Dogs Can Talk: CRIM-TRACK(Cranfield University, 2022-11-22T14:39:37Z) Hardy, IonaThis image is a digitally drawn short comic highlighting the CRIM-TRACK sniffer, a device that utilises a colourimetric sensor system to detect illicit compounds by their vapour at sensitivity rivalling a sniffer dog, but with better discrimination. Both detection methods can detect multiple substances, but sniffer dogs cannot signal which substance they have found, whilst the CRIM-TRACK sniffer can. The research aims to contribute to developing the CRIM-TRACK sniffer device, specifically the disposable colourimetric microchips used. This is being carried out by investigating the colour change mechanisms of select dyes when they encounter illicit compounds such as illicit drugs, homemade explosives, and their precursor chemicals using common analytical techniques. This data will allow future generations of the microchip to be tuned via dye selection for specific scenarios.Item Open Access Visualising the Dispersion of Particles Within a Functionally Graded Material(Cranfield University, 2022-11-22T14:40:10Z) Powell, DanielFunctionally graded materials (FGMs) are designed to carefully alter material properties along a selected axis. This image shows FGMs created through mixing varying percentage volumes of high-density tungsten powder (in orange) with a low-viscosity epoxy (in white). Black regions show pores. As the epoxy cures the tungsten particles settle at various depths under gravity, notably in the 1%, 5% and 10% samples. Whilst there are multiple uses for FGMs, this research investigates if they could control the passage of damaging shock waves through a ceramic armour system, especially at the interlayer between a ceramic and metal.