Laser optoacoustic method of local porosity measurement of particles reinforced composites

In the present work we have realized experimentally the laser optoacoustic method for the measurements of local volume fraction of air pores (porosity P) of isotropic composite materials. It is based on measurements of phase velocities of thermooptically excited longitudinal ultrasonic waves in comp...

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Bibliographic Details
Published in:Journal of physics. Conference series 2011-01, Vol.278 (1), p.012038-4
Main Authors: Podymova, N B, Karabutov, A A, Kobeleva, L I, Chernyshova, T A
Format: Article
Language:English
Subjects:
Acoustic waves
Aluminum base alloys
Composite materials
Diameters
Disks
Frequency ranges
Lasers
Particles (of physics)
Particulate composites
Phase velocity
Physics
Porosity
Porous metals
Silicon carbide
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Summary:In the present work we have realized experimentally the laser optoacoustic method for the measurements of local volume fraction of air pores (porosity P) of isotropic composite materials. It is based on measurements of phase velocities of thermooptically excited longitudinal ultrasonic waves in composite samples in the frequency range 0.5÷50 MHz. The local porosity (lateral resolution 1÷2 mm) is determined using the dependence of phase velocity of longitudinal acoustic wave on porosity for porous metals and theoretical calculation of phase velocity in a composite with the two-phase medium model. A number of aluminum alloy (silumin) matrix composite samples reinforced by SiC particles of a different mass concentration with the mean particle size of 14 mm was investigated. The samples were disks with the diameter d 40 mm and the porosity in the center and in the periphery area of each sample was determined. The increase of mass concentration of the filler SiC leads to the growth of P. The results coincide within relative inaccuracy of 2–3% with the gravimetrical measurements of average value, the porosity in the center of each sample was slightly higher than in the periphery.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/278/1/012038