Elasticity is calculated from the velocity of elastic wave through the sample. Static properties measured form rock-mechanics tests are compared with dynamic properties calculated from the velocity of elastic wave.
Compressional wave velocity Vp and shear wave velocity Vs are measured by recording the travel time of a transmitted ultrasonic wave through a sample of known length. Travel time is calculated from the first break for P-wave and from the zero crossing for the S-wave. Overall accuracy of the measurement is 50 m/s for P-waves and 100 m/s for S-waves.
Elastic wave velocity measurement can be performed at variable axial, radial and fluid pressure condition. It can be combined with geotechnical and flooding tests.
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Waves: Compressional wave and two shear waves at perpendicular directions.
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Frequency: 100 kHz to 1000 kHz.
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Amplitude: 5 Volt
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Stress level: 1 MPa to 50 MPa
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Stress condition: Uniaxial, hydrostatic.
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Temperature: 15°C to 25°C
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Sample size: