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Loading from Shallow Buried Blast Events and the Effect on Plate Deformations

Fuller, Benjamin J (2018) Loading from Shallow Buried Blast Events and the Effect on Plate Deformations. PhD thesis, University of Sheffield.

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Abstract

This thesis describes the design and construction of an experimental apparatus to enable the repeatable testing of appliqué protective systems against buried charges. This thesis highlights the difficulties in understanding and predicting buried blast loading, as well as why it is important to know the distribution of impulse as well as how quickly it is delivered. A review of the literature investigating the phenomenology of buried charge testing is presented, along with previous work which has looked into the factors which can affect the output of a buried charge. Tests were conducted using the developed apparatus, with the detailed output of 21 tests against varying thicknesses of Armox 440T steel being presented within this thesis. The testing was conducted at 1/2 scale, with charge sizes between 400 and 1000 grams, and nominal plate thicknesses between 6 and 12 mm. For each test the full deformation profile was provided along with dynamic (peak) and residual deflections to enable numerical model validation. The preparation of the soil bed for the testing has been carefully controlled based on previous experience at the University of Sheffield. The test series used Leighton Buzzard 14/25 sand which is a silica based uniform soil with particle sizes between 0.6–1.18 mm. This was prepared to a moisture content of 5% and dry density of 1620 kg/m3. Analysis of the test series was done using the Nurick and Martin (1989) analysis method with modified correction factor based on the distribution of kinetic energy. This analysis has shown that for the appliqué systems tested, the normalised deflection can be predicted if the normalised total impulse as well as the distribution of impulse imparted to the system is known; this finding should be the basis of a fast running engineering model for plate deformation from shallow buried blast and other non-uniform impulsive loading.

Item Type: Thesis (PhD)
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Civil and Structural Engineering (Sheffield)
Identification Number/EthosID: uk.bl.ethos.778775
Depositing User: Dr. Benjamin J Fuller
Date Deposited: 22 Jul 2019 10:03
Last Modified: 25 Sep 2019 20:08
URI: http://etheses.whiterose.ac.uk/id/eprint/24365

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