INTERNAL FRICTION OF GLASSY POLYCARBONATE DURING PLASTIC FLOW

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Abstract
We have measured internal friction of polycarbonate in torsion, during i) a constant strain-rate tensile test ; ii) a differential strain-rate test ; iii) several relaxation tests. We show that internal friction is strongly dependent on strain rate [MATH], but independant on strain and stress. Polycarbonate behaviour shows some analogies with metals : therefore interpretation of the results is based upon the assumption that deformation in due to defects motions. In this view, internal friction can provide means for estimating internal stress

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