MOTION OF AN ELASTIC SPHERE IN AN ACOUSTIC WAVE FIELD IN FLUIDS

Geophysics ◽  
1946 ◽  
Vol 11 (2) ◽  
pp. 178-182
Author(s):  
Alfred Wolf
Keyword(s):  
Acoustic Wave ◽  
Wave Field ◽  
Elastic Constants ◽  
Wave Length ◽  
Zero Order ◽  
Rigid Sphere ◽  
Elastic Sphere ◽  
Transverse Waves ◽  
Scattering Potential

The motion of an elastic sphere in an acoustic wave field in fluids is determined as function of the elastic constants of the sphere, its radius, and the frequency of the wave field. It is found that the motion differs but little from the motion of an infinitely rigid sphere when the wave length of transverse waves in the elastic sphere is at least as long as the circumference of the sphere. The coefficient of zero order scattering potential in the fluid is determined.

TRANSMISSION OF SOUND THROUGH THIN PLATES

1939 ◽  
Vol 17a (9) ◽  
pp. 179-193 ◽  
Author(s):  
F. H. Sanders
Keyword(s):  
Satisfactory Agreement ◽  
Elastic Constants ◽  
High Frequency ◽  
Critical Angle ◽  
Wave Length ◽  
Thin Plates ◽  
Recent Theory ◽  
Transverse Waves ◽  
Longitudinal Waves ◽  
High Frequency Sound

The transmission of high frequency sound through plates of brass and nickel has been studied for angles of incidence ranging from 0 to 70 degrees, using effective plate thicknesses varying from one-twentieth of a wave-length to one wave-length. In addition to strong transmissions in the region below the normal critical angle, very sharp and intense transmission maxima are observed at angles of incidence greatly in excess of the critical angle. These transmission maxima fall within three clearly denned angular regions: (i) angles between zero and the critical angle for longitudinal waves; (ii) angles between the critical angle for longitudinal waves and the critical angle for transverse waves; and (iii) angles above the critical angle for transverse waves. In Regions (i) and (ii) the observed data are in satisfactory agreement with a recent theory advanced by Reissner, and good values of the elastic constants are obtained. By an extension of Lamb's theory for flexural vibrations in bars the results in Region (iii) can be interpreted.

scholarly journals Theoretical investigation of acoustic wave velocity of aluminum phosphide under pressure

2019 ◽  
Vol 7 (1) ◽  
pp. 3
Author(s):  
Salah Daoud ◽  
Abdelhakim Latreche ◽  
Pawan Kumar Saini
Keyword(s):  
Acoustic Wave ◽  
Wave Velocity ◽  
Elastic Constants ◽  
Structural Parameters ◽  
Theoretical Data ◽  
Aluminum Phosphide ◽  
Semiconducting Material ◽  
Wave Velocities ◽  
Knoop Microhardness ◽  
Good Agreement

The bulk and surface acoustic wave velocities of Aluminum phosphide (AlP) semiconducting material under pressure up to 9.5 GPa were studied. The structural parameters and the elastic constants used in this work are taken from our previous paper published in J. Optoelec-tron. Adv. M. 16, 207 (2014). The results obtained at zero-pressure are analyzed and compared with other data of the literature. In addition, the acoustic Grüneisen parameter and the Vickers and Knoop microhardness are predicted and analyzed in detail. Our calculated results are in good agreement with the experimental and other theoretical data of literature.   

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