Abstract
The propagation velocities c and logarithmic decrements δ in the longitudinal and shear modes, used for calculating the complex deformation characteristics of polymeric materials, can be simultaneously determined by means of a compound vibrator with a mechanical clamp. Relations are obtained for determining c and δ when the other end of the specimen is free or fixed and with allowance for the mechanical losses in the measuring rod. The method has been tested on specimens of P-4020E polyethylene at various temperature.
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