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Internal stress wave measurements in solids subjected to lithotripter pulses

Semiconductor strain gauges were used to measure the internal strain along the axes of spherical and disk plaster specimens when subjected to lithotripter shock pulses. The pulses were produced by one of two lithotripters. The first source generates spherically diverging shock waves of peak pressure... Full description

Journal Title: The Journal of the Acoustical Society of America August 1993, Vol.94(2), pp.652-661
Main Author: Gracewski, S. M.
Other Authors: Dahake, Girish , Ding, Zhong , Burns, S. J. , Everbach, E. Carr
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0001-4966 ; DOI: 10.1121/1.406882
Link: http://dx.doi.org/10.1121/1.406882
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recordid: aip_complete10.1121/1.406882
title: Internal stress wave measurements in solids subjected to lithotripter pulses
format: Article
creator:
  • Gracewski, S. M.
  • Dahake, Girish
  • Ding, Zhong
  • Burns, S. J.
  • Everbach, E. Carr
subjects:
  • Physics
ispartof: The Journal of the Acoustical Society of America, August 1993, Vol.94(2), pp.652-661
description: Semiconductor strain gauges were used to measure the internal strain along the axes of spherical and disk plaster specimens when subjected to lithotripter shock pulses. The pulses were produced by one of two lithotripters. The first source generates spherically diverging shock waves of peak pressure approximately 1 MPa at the surface of the specimen. For this source, the incident and first reflected pressure ( P ) waves in both sphere and disk specimens were identified. In addition, waves reflected by the disk circumference were found to contribute significantly to the strain fields along the disk axis. Experimental results compared favorably to a ray theory analysis of a spherically diverging shock wave striking either concretion. For the sphere, pressure contours for the incident P wave and caustic lines were determined theoretically for an incident spherical shock wave. These caustic lines indicate the location of the highest stresses within the sphere and therefore the areas where damage may occur. Results were also presented for a second source that uses an ellipsoidal reflector to generate a 30‐MPa focused shock wave, more closely approximating the wave fields of a clinical extracorporeal lithotripter.
language: eng
source:
identifier: ISSN: 0001-4966 ; DOI: 10.1121/1.406882
fulltext: fulltext
issn:
  • 0001-4966
  • 00014966
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titleInternal stress wave measurements in solids subjected to lithotripter pulses
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ispartofThe Journal of the Acoustical Society of America, August 1993, Vol.94(2), pp.652-661
descriptionSemiconductor strain gauges were used to measure the internal strain along the axes of spherical and disk plaster specimens when subjected to lithotripter shock pulses. The pulses were produced by one of two lithotripters. The first source generates spherically diverging shock waves of peak pressure approximately 1 MPa at the surface of the specimen. For this source, the incident and first reflected pressure ( P ) waves in both sphere and disk specimens were identified. In addition, waves reflected by the disk circumference were found to contribute significantly to the strain fields along the disk axis. Experimental results compared favorably to a ray theory analysis of a spherically diverging shock wave striking either concretion. For the sphere, pressure contours for the incident P wave and caustic lines were determined theoretically for an incident spherical shock wave. These caustic lines indicate the location of the highest stresses within the sphere and therefore the areas where damage may occur. Results were also presented for a second source that uses an ellipsoidal reflector to generate a 30‐MPa focused shock wave, more closely approximating the wave fields of a clinical extracorporeal lithotripter.
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descriptionSemiconductor strain gauges were used to measure the internal strain along the axes of spherical and disk plaster specimens when subjected to lithotripter shock pulses. The pulses were produced by one of two lithotripters. The first source generates spherically diverging shock waves of peak pressure approximately 1 MPa at the surface of the specimen. For this source, the incident and first reflected pressure ( P ) waves in both sphere and disk specimens were identified. In addition, waves reflected by the disk circumference were found to contribute significantly to the strain fields along the disk axis. Experimental results compared favorably to a ray theory analysis of a spherically diverging shock wave striking either concretion. For the sphere, pressure contours for the incident P wave and caustic lines were determined theoretically for an incident spherical shock wave. These caustic lines indicate the location of the highest stresses within the sphere and therefore the areas where damage may occur. Results were also presented for a second source that uses an ellipsoidal reflector to generate a 30‐MPa focused shock wave, more closely approximating the wave fields of a clinical extracorporeal lithotripter.
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abstractSemiconductor strain gauges were used to measure the internal strain along the axes of spherical and disk plaster specimens when subjected to lithotripter shock pulses. The pulses were produced by one of two lithotripters. The first source generates spherically diverging shock waves of peak pressure approximately 1 MPa at the surface of the specimen. For this source, the incident and first reflected pressure ( P ) waves in both sphere and disk specimens were identified. In addition, waves reflected by the disk circumference were found to contribute significantly to the strain fields along the disk axis. Experimental results compared favorably to a ray theory analysis of a spherically diverging shock wave striking either concretion. For the sphere, pressure contours for the incident P wave and caustic lines were determined theoretically for an incident spherical shock wave. These caustic lines indicate the location of the highest stresses within the sphere and therefore the areas where damage may occur. Results were also presented for a second source that uses an ellipsoidal reflector to generate a 30‐MPa focused shock wave, more closely approximating the wave fields of a clinical extracorporeal lithotripter.
pubAcoustical Society of America
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date1993-08