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1.1 This test method describes equipment and procedures for laboratory measurements of the pulse velocities of compression waves and shear waves in rock (1) (Note 1) and the determination of ultrasonic elastic constants (Note 2) of an isotropic rock or one exhibiting slight anisotropy.
Note 1-The compression wave velocity as defined here is the dilatational wave velocity. It is the propagation velocity of a longitudinal wave in a medium which is effectively infinite in lateral extent. It should not be confused with the bar or rod velocity. Note 2-The elastic constants determined by this test method are termed ultrasonic since the pulse frequencies used are above the audible range. The terms sonic and dynamic are sometimes applied to these constants but do not describe them precisely (2). It is possible that the ultrasonic elastic constants may differ from those determined by other dynamic methods.1.2 This test method is valid for wave velocity measurements in both anisotropic and isotropic rocks although the velocities obtained in grossly anisotropic rocks may be influenced by such factors as direction, travel distance, and diameter of transducers.
1.3 The ultrasonic elastic constants are calculated from the measured wave velocities and the bulk density. The limiting degree of anisotropy for which calculations of elastic constants are allowed and procedures for determining the degree of anisotrophy are specified.
1.4 The values stated in U.S. customary units are to be regarded as the standard. The metric equivalents of U.S. customary units may be approximate.
Subject Index
Anisotropy (rock); Elastic constants; Isotropic rock specimens; Pulse velocities; Rock; Shear testing;emrock; Ultrasonic testing; Velocity;empulse; rock;empulse velocities/ultrasonic elastic constants, laboratory test,;
Volume 04.08