Elastic softening of sandstone due to a wideband acoustic pulse observed by dynamic acousto-elastic testing

2020 ◽  
Vol 148 (4) ◽  
pp. 2460-2460
Author(s):  
John M. Cormack ◽  
Thomas G. Muir ◽  
Charles M. Slack ◽  
Mark F. Hamilton
Keyword(s):  
Acoustic Pulse ◽  
Elastic Softening

Elastic softening of sandstone due to a wideband acoustic pulse

2020 ◽  
Vol 147 (2) ◽  
pp. 1006-1014
Author(s):  
Thomas G. Muir ◽  
John M. Cormack ◽  
Charles M. Slack ◽  
Mark F. Hamilton
Keyword(s):  
Acoustic Pulse ◽  
Elastic Softening

scholarly journals Spatial Decomposition of a Broadband Pulse Caused by Strong Frequency Dispersion of Sound in Acoustic Metamaterial Superlattice

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 125
Author(s):  
Yuqi Jin ◽  
Yurii Zubov ◽  
Teng Yang ◽  
Tae-Youl Choi ◽  
Arkadii Krokhin ◽  
...  
Keyword(s):  
Acoustic Pulse ◽  
Frequency Dispersion ◽  
Transmission Band ◽  
Lateral Position ◽  
Operating Frequency ◽  
Frequency Range ◽  
Frequency Spectra ◽  
Acoustic Metamaterial ◽  
Superlattice Structure ◽  
Broadband Pulse

An acoustic metamaterial superlattice is used for the spatial and spectral deconvolution of a broadband acoustic pulse into narrowband signals with different central frequencies. The operating frequency range is located on the second transmission band of the superlattice. The decomposition of the broadband pulse was achieved by the frequency-dependent refraction angle in the superlattice. The refracted angle within the acoustic superlattice was larger at higher operating frequency and verified by numerical calculated and experimental mapped sound fields between the layers. The spatial dispersion and the spectral decomposition of a broadband pulse were studied using lateral position-dependent frequency spectra experimentally with and without the superlattice structure along the direction of the propagating acoustic wave. In the absence of the superlattice, the acoustic propagation was influenced by the usual divergence of the beam, and the frequency spectrum was unaffected. The decomposition of the broadband wave in the superlattice’s presence was measured by two-dimensional spatial mapping of the acoustic spectra along the superlattice’s in-plane direction to characterize the propagation of the beam through the crystal. About 80% of the frequency range of the second transmission band showed exceptional performance on decomposition.

Ultrasonic study of the elastic softening in superconducting Bi2Sr2CaCu2O8 single crystals above room temperature

1995 ◽  
Vol 148 (1) ◽  
pp. 213-218 ◽  
Author(s):  
S. O. Chen ◽  
H. M. Shen ◽  
Y. N. Huang ◽  
B. Ju ◽  
Y. N. Wang
Keyword(s):  
Single Crystals ◽  
Room Temperature ◽  
Ultrasonic Study ◽  
Elastic Softening

Acoustic pulse propagation studies in the Gulf of Mexico

2005 ◽  
Author(s):  
J.W. Caruthers ◽  
V. Kamenkovich ◽  
N.A. Sidorovskaia ◽  
I. Udovydchenkov ◽  
G. Ioup
Keyword(s):  
Gulf Of Mexico ◽  
Pulse Propagation ◽  
Acoustic Pulse
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