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The influence of Poisson's ratio on the excitability of the first higher symmetric (S1) zero-group velocity Lamb mode.

Rydén, Nils LU (2010) In Journal of the Acoustical Society of America 128(4). p.2376-2376
Abstract
The impact echo (IE) method is widely used in non-destructive testing of concrete plate like structures but has proved difficult to apply on asphalt pavements. Observed low IE resonance amplitudes on asphalt have been attributed to larger material damping but the present study shows that it may also be an effect from a larger Poisson's ratio. The IE frequency corresponds to the stationary resonance of the S1 Lamb mode at zero-group velocity (ZGV). It has been previously shown that the S1 ZGV Lamb mode only exists below a Poisson's ratio of 0.45. [Prada et al., J. Acoust. Soc. Am. 124, 203-212 (2008).] The present study investigates the magnitude of the excitability and damping ratio of the S1 ZGV mode as a function of Poisson's ratio. The... (More)
The impact echo (IE) method is widely used in non-destructive testing of concrete plate like structures but has proved difficult to apply on asphalt pavements. Observed low IE resonance amplitudes on asphalt have been attributed to larger material damping but the present study shows that it may also be an effect from a larger Poisson's ratio. The IE frequency corresponds to the stationary resonance of the S1 Lamb mode at zero-group velocity (ZGV). It has been previously shown that the S1 ZGV Lamb mode only exists below a Poisson's ratio of 0.45. [Prada et al., J. Acoust. Soc. Am. 124, 203-212 (2008).] The present study investigates the magnitude of the excitability and damping ratio of the S1 ZGV mode as a function of Poisson's ratio. The frequency response from a point source is predicted using a finite element model. Results show that the excitability decreases with increasing Poisson's ratio. The excitability of the S1 ZGV mode is about twice as high at a Poisson's ratio of 0.18 compared to 0.30, which are representative values for concrete and asphalt, respectively. The modal damping ratio increases with Poisson's ratio, causing an overall lower IE resonance amplitude at higher values of Poisson's ratio. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the Acoustical Society of America
volume
128
issue
4
pages
2376 - 2376
publisher
American Institute of Physics
external identifiers
  • pmid:20968920
ISSN
1520-8524
DOI
10.1121/1.3508441
language
English
LU publication?
yes
id
34909b0b-9d03-4c0c-80a5-d5990be6398c (old id 1710882)
date added to LUP
2010-11-05 11:19:03
date last changed
2018-11-21 20:13:30
@article{34909b0b-9d03-4c0c-80a5-d5990be6398c,
  abstract     = {The impact echo (IE) method is widely used in non-destructive testing of concrete plate like structures but has proved difficult to apply on asphalt pavements. Observed low IE resonance amplitudes on asphalt have been attributed to larger material damping but the present study shows that it may also be an effect from a larger Poisson's ratio. The IE frequency corresponds to the stationary resonance of the S1 Lamb mode at zero-group velocity (ZGV). It has been previously shown that the S1 ZGV Lamb mode only exists below a Poisson's ratio of 0.45. [Prada et al., J. Acoust. Soc. Am. 124, 203-212 (2008).] The present study investigates the magnitude of the excitability and damping ratio of the S1 ZGV mode as a function of Poisson's ratio. The frequency response from a point source is predicted using a finite element model. Results show that the excitability decreases with increasing Poisson's ratio. The excitability of the S1 ZGV mode is about twice as high at a Poisson's ratio of 0.18 compared to 0.30, which are representative values for concrete and asphalt, respectively. The modal damping ratio increases with Poisson's ratio, causing an overall lower IE resonance amplitude at higher values of Poisson's ratio.},
  author       = {Rydén, Nils},
  issn         = {1520-8524},
  language     = {eng},
  number       = {4},
  pages        = {2376--2376},
  publisher    = {American Institute of Physics},
  series       = {Journal of the Acoustical Society of America},
  title        = {The influence of Poisson's ratio on the excitability of the first higher symmetric (S1) zero-group velocity Lamb mode.},
  url          = {http://dx.doi.org/10.1121/1.3508441},
  volume       = {128},
  year         = {2010},
}