Abstract
A method for the measurement of the internal friction in solids by measuring the instantaneous values of applied sinusoidal stress, the resulting strain and the phase difference between them is presented in this paper. The experimental setup utilizes the instruments normally used in the vibration analysis and the variation of internal friction with frequency can be recorded automatically on a level recorder. The values obtained by this method are compared with those by the amplitude repsonse method for two epoxy resin systems. The agreement is found to be satifactory. The method is very suitable for locating the relaxation peaks up to 2000 Hz.
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