Results 171 to 180 of about 71,674 (211)
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Transactions of the American Society of Mechanical Engineers, 1926
Abstract In connection with a test devised to determine quantitatively the amount of friction within the metal of a steel shaft, it was found that the internal frictional forces were totally unlike those of a viscous fluid, as assumed by many investigators, where the forces are greater the more rapid the deformation. Instead of this, the
A. L. Kimball, D. E. Lovell
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Abstract In connection with a test devised to determine quantitatively the amount of friction within the metal of a steel shaft, it was found that the internal frictional forces were totally unlike those of a viscous fluid, as assumed by many investigators, where the forces are greater the more rapid the deformation. Instead of this, the
A. L. Kimball, D. E. Lovell
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Journal of the Physical Society of Japan, 1958
Internal friction of single crystal of lead (99.99% pure) was measured with longitudinal vibration in kilocycle range using the composite piezoelectric quartz oscillator. The dependences of the internal friction on the strain amplitude (0.5-12×10 -6 ), on the frequency (64, 192 kc/sec) of vibration, and on temperature (140–340°K) were mainly studied ...
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Internal friction of single crystal of lead (99.99% pure) was measured with longitudinal vibration in kilocycle range using the composite piezoelectric quartz oscillator. The dependences of the internal friction on the strain amplitude (0.5-12×10 -6 ), on the frequency (64, 192 kc/sec) of vibration, and on temperature (140–340°K) were mainly studied ...
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Internal Friction in Solids III. Experimental Demonstration of Thermoelastic Internal Friction
Physical Review, 1938In order to demonstrate the presence of thermoelastic internal friction, the authors measured the internal friction of a copper reed over a wide frequency range (50 to 4000 cycles/sec.). They obtained a maximum precisely at the predicted frequency. The observed variation of internal friction with frequency proves that, over a wide frequency range, the ...
C. Zener, W. Otis, R. Nuckolls
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The Journal of the Acoustical Society of America, 1978
This paper intends to show that the low-amplitude effects, in particular the attenuation proportional to the frequency from very low frequencies up to the kilohertz range, are connected with the motion of dislocations in cracks. The measurements have been made of the resonant frequencies and the internal friction of spherical rock speciments, including
W. P. Mason +3 more
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This paper intends to show that the low-amplitude effects, in particular the attenuation proportional to the frequency from very low frequencies up to the kilohertz range, are connected with the motion of dislocations in cracks. The measurements have been made of the resonant frequencies and the internal friction of spherical rock speciments, including
W. P. Mason +3 more
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Internal Friction in Solids. I. Theory of Internal Friction in Reeds
Physical Review, 1937In a vibrating reed opposite sides have dilations of opposite signs. Thus when one side is heated the other is cooled. At low frequencies the vibrations are isothermal. At high frequencies they are adiabatic. At intermediate frequencies they are of a hybrid type accompanied by internal friction. In this paper this internal friction is calculated solely
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Distribution Of Internal Friction
The Journal of the Acoustical Society of America, 1964A series of studies has been made in an attempt to determine the selection of the proper independent variable that will allow for the prediction of the distribution of internal friction in mechanical vibrators of various geometries. Previous studies of cylindrical vibrating bars have indicated that the loss is a sole function of the longitudinal strain.
R. W. Benson, J. R. Chapman
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Internal friction of neptunium
Journal of Nuclear Materials, 1969Abstract The internal friction of neptunium has been measured from room temperature to 595 °C in a low-frequency inverted-torsion pendulum. Particular attention was given to the phase transformations by analyzing the data for the modes of transformation. In addition, a large peak was observed in the beta phase.
J.E. Selle, J.J. Rechtien
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Internal friction in gadolinium
Philosophical Magazine, 1968Abstract The low-temperature internal friction spectrum of gadolinium consists of two peaks, labelled α and β. The former is independent and the latter dependent on, the strain amplitude. Domain wall motion, induced by the applied stress, is responsible for both peaks, which are not caused by a relaxation mechanism.
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1950
A summary of the current knowledge on the subject of internal friction is presented. An experimental investigation of the variation of specific damping capacity with torsional stress for three metals is described. It is found that the specific damping capacity can be represented. Calculations are made of the effect on specific damping capacity of type
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A summary of the current knowledge on the subject of internal friction is presented. An experimental investigation of the variation of specific damping capacity with torsional stress for three metals is described. It is found that the specific damping capacity can be represented. Calculations are made of the effect on specific damping capacity of type
openaire +1 more source