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The application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities Jarvis, Kevin Donald Gibson
Abstract
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.
Item Metadata
Title |
The application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1994
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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.
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Extent |
3862484 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-01-09
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0052954
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1995-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.