Effect of the porosity and particle size of materials on sound-wave velocity |
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| Authors: | S S Sekoyan V R Shlegel’ S S Batsanov S M Gavrilkin K B Poyarkov A A Gurkov A A Duro |
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| Institution: | (1) All-Russia Research Institute of Physicotechnical and Radio Engineering Measurements, Mendeleevo, 141570, Moscow Region, Russia;(2) Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, 142432, Moscow Region, Russia;(3) Moscow State Institute of Electronic Engineering (Technical university), Moscow, 124498, Zelenograd, Russia |
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| Abstract: | Methods were developed to measure longitudinal and transverse sound velocities in porous materials — various Zn-S mixtures
and KBr samples. It is shown that, on exposure to ultrasound with a wavelength far exceeding the pore size in pressed samples,
a porous body behaves as a continuous medium. Sound velocity in a porous material was found to depend on the quantitative
ratio of vacuum, air, and toluene in the pores. Bulk sound velocities estimated using an additive method agree with experimental
data within an error not more than 10%. It was found that removal of moisture traces from porous samples led to significant
absorption of sound waves.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 50, No. 4, pp. 121–127, July–August, 2009. |
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| Keywords: | longitudinal shear and bulk sound velocities porous body elastic modulus |
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