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金属学报 1982
FORMULAE FOR MEASURING INTERNAL FRICTION AND MODULUS BY MARX METHOD
Abstract: Considering the effects of adhesive layers and filaments supporting the composite resonator on the measurement of the internal friction and modulus, the accurate expressions for the internal friction and elastic modulus have been obtained by solving the partial differential equations of the correlative variations of composite resonators. The additional internal friction due to adhesive layer is proportional to the product of square of amplitude of the strain in the layer and the internal friction of adhesive. The internal friction owing to supporting filaments is found to be proportional to the internal frictions of specimen and of quartz resonator.The non-linear and non-steady internal friction backgrounds caused by flowing and cracking of adhesives observed in the internal friction measurement of low damping specimen were explained. It was also suggested some effective approachs to raise the precision of the measurement of internal friction by Marx method.
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