... was due to frequency (strain rate), samples were tested in torsional shear at various frequencies. Results indicated that the shear modulus always increased with frequency, though the effect was fairly minor. No observable effect of frequency on damping ratio was measured for samples tested in either...

... batch of sand, and published predictions of G max . Finally, the Ottawa sand results and, results from selected in situ samples are presented. resonant column shear modulus damping ratio effective confining pressure modified pressure chamber Ottawa Sand deep soil deposits Kenneth O...

... of the phase lag, tan φ, ratio of loss modulus to storage modulus, E"/E' , loss factor, η, specific damping capacity, Ψ, inverse quality factor, Q -1 , log decrement, δ, and damping ratio, ζ. Each damping constant is defined in relation to the method used to measure it. Thus it is sometimes difficult...

... the vibration-based parameters to the microstructural changes that occur during processing of the C/C composites. The two parameters studied were the damping ratio value and the resonant frequency of the composite structure. The composite was fabricated using graphite fabric and phenolic resin as the matrix...

... transferred with their caps in place to another cell where they were subjected to slower cyclic loading under increasingly larger stress amplitudes. The results of the tests that were conducted on a Gulf of Mexico clay are given and analyzed. Shear moduli, damping ratios, and frequency responses obtained...

... Laboratory tests with a Hardin oscillator were used to study the time-dependent characteristics of the damping ratio of isotropically consolidated specimens of kaolinite and calcium bentonite. Damping was determined using a steady-state method and from the decay of free vibrations. After...