The application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities

The objective of this thesis is to evaluate bender elements as a source and receiver of elastic waves in cohesionless sand. The techniques used to build the benders that are detailed include the use of an impedance analyzer to monitor changes in the electrical and mechanical response. Placing the...

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Main Author: Jarvis, Kevin Donald Gibson
Language:English
Published: 2009
Online Access:http://hdl.handle.net/2429/3452
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spelling ndltd-LACETR-oai-collectionscanada.gc.ca-BVAU.2429-34522014-03-14T15:39:00Z The application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities Jarvis, Kevin Donald Gibson The objective of this thesis is to evaluate bender elements as a source and receiver of elastic waves in cohesionless sand. The techniques used to build the benders that are detailed include the use of an impedance analyzer to monitor changes in the electrical and mechanical response. Placing the benders in a bucket of sand demonstrated the short compact nature of the bender waveform in both a shear and compressional wave orientation. An experiment in a non-homogeneous sandbox showed the change in shear waveform with separation of the elements. A Plexiglas cylinder with benders was used to measure changes in shear and compressional wave velocity as a function of confining pressure and the saturation with water and silicon oil. The effects of friction along the walls of the cylinder resulted in an unknown and irreproducible confining stress on the sand between the benders. An experiment to study the effect of silicon oil viscosity on shear modulus was inconclusive as a result of the unknown stress condition. The bender elements proved to be an excellent source and receiver of elastic waves in cohesionless sand. 2009-01-09T18:18:12Z 2009-01-09T18:18:12Z 1994 2009-01-09T18:18:12Z 1995-05 Electronic Thesis or Dissertation http://hdl.handle.net/2429/3452 eng UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]
collection NDLTD
language English
sources NDLTD
description The objective of this thesis is to evaluate bender elements as a source and receiver of elastic waves in cohesionless sand. The techniques used to build the benders that are detailed include the use of an impedance analyzer to monitor changes in the electrical and mechanical response. Placing the benders in a bucket of sand demonstrated the short compact nature of the bender waveform in both a shear and compressional wave orientation. An experiment in a non-homogeneous sandbox showed the change in shear waveform with separation of the elements. A Plexiglas cylinder with benders was used to measure changes in shear and compressional wave velocity as a function of confining pressure and the saturation with water and silicon oil. The effects of friction along the walls of the cylinder resulted in an unknown and irreproducible confining stress on the sand between the benders. An experiment to study the effect of silicon oil viscosity on shear modulus was inconclusive as a result of the unknown stress condition. The bender elements proved to be an excellent source and receiver of elastic waves in cohesionless sand.
author Jarvis, Kevin Donald Gibson
spellingShingle Jarvis, Kevin Donald Gibson
The application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities
author_facet Jarvis, Kevin Donald Gibson
author_sort Jarvis, Kevin Donald Gibson
title The application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities
title_short The application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities
title_full The application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities
title_fullStr The application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities
title_full_unstemmed The application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities
title_sort application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities
publishDate 2009
url http://hdl.handle.net/2429/3452
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