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The test yields the complex Young's modulus and shear modulus, the associated internal damping property expressed as the lag in time between stress and strain, and the complex Poisson's ratio obtained from measurements of wave propagation in steady state vibration. The specimen is enclosed in a pressure cell while under vibration and may be tested under the various conditions of ambient state of stress used in the testing of soils and described in such publications as Procedures for Testing Soils, ASTM Committee D-18 on Soils for Engineering Purposes (1964) and Laboratory Soils Testing, U. S. Army, Office of the Chief of Engineers, Engineering Manual EM 1110-2-1906 (1968). The vibratory load is sinusoidal and can range in frequency from about 50 to 10,000 Hz, with dynamic stresses from less than 0.1 psi to about 5.0 psi. The material is considered to be viscoelastic, and linear viscoelastic theory is used to compute the desired parameters. Analysis has shown that these assumptions are reasonable.
Research Civil Engineer, Applied Research BranchU.S. Army Cold Regions Research and Engineering Laboratory, Hanover, N.H