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Interrelation between dynamic moduli and compliances in polymers

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Interrelation between dynamic moduli and compliances in polymers (EN)
Theocaris, PS (EN)
journalArticle (EN)
2014-03-01T01:05:27Z
1969 (EN)
Based on the fact that, for a large number of polymers, the lateral deformation in tension is a contraction and the volume dilatation must be positive, bounds were established for the values of the lateral contraction ratio functions in creep and relaxation. These bounds are that v*=(v′ -i v″) must be positive and smaller than 0.5. It was shown in the paper that in the case when v* is positive, the loss tangents for various modes of deformation in relaxation or creep follow the relations: a) For relaxation: tan δG > tan δE > tan δm > tan δK > tan δvr b) For creep: tan δj > tan δD > tan δM > tan δB > tan δvc where the indices G and J correspond to a shear mode of deformation in relaxation or creep, the indices E and D to extension, the index M to longitudinal bulk, the indices K and B to bulk deformation and v r and v c to the LCR functions in relaxation or creep. Extensive experimental evidence with various types of polymers submitted to different modes of loading corroborates with the results of the theory. © 1969 Dr. Dietrich Steinkopff Verlag. (EN)
Indexation (EN)
Kolloid-Zeitschrift und Zeitschrift für Polymere (EN)
National Technical University of Athens
Digital Library of National Technical University of Athens | Dspace@NTUA
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
Ιδρυματικό Αποθετήριο
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