Device for determination of elasticity and nonelasticity characteristics of materials in vacuum at low temperatures

Improving the accuracy of determination of the elastic and inelastic characteristics of high-damping materials by resonance methods

“…Then we calculated the error of determination of the number of vibrations in the process of the prescribed lowering of the vibration amplitude, the mean decrement, and the relative error of the decrement determination Δδ δ av . If the error of the determination of the number of vibrations exceeded approximately 20%, the quality factor Q * of the material was determined by the method of the resonance curves [4]. The relative error of this method ΔQ Q * * was calculated by measuring the resonance curve width at the prescribed level (X X 0 0 0 707 = .…”

“…The error of the decrement determination in free damping vibrations was estimated by testing a specimen using a setup described elsewhere [4], with the decrement being calculated from the formula δ = 1 3 n ln in the following way. The number of the specimen vibrations was measured as the amplitude decreased by a factor of three for five different fastenings of the specimen to the suspension.…”

“…Sufficiently simple and convenient resonance methods have found widespread application in determining the elastic and inelastic characteristics of materials [1][2][3][4][5][6]. The use of the above methods in testing of materials with a low and medium damping capacity (according to the classification given in [7]), which are characterized by the magnitude of the logarithmic decrement of vibrations δ ≤ 5%, enables one to obtain the experimental data that are of reasonable accuracy.…”