The applicability of Nutting's equation of the mechanical behavior of some soft plasticized polyvinyl chloride preparations noted by Dyson in creep experiments is further demonstrated by force-length measurements at constant rate of strain. This suggests new criteria for the characterization of soft plasticized PVC. For example, in a stretching experiment in which the sample is subjected to a strain (L−1) which increases linearly with time (t) at the rate (R), definition of ``modulus'' as the limit at small strains of the ratio of the force (F) to the strain is clearly inappropriate. That is, when L−1=GFmtn,lim lim L−1→0(FL−1)=(L−1)(1−n−m)/mRn/mG−1/m,which may be zero or infinite and also depends on the strain rate. Some even more general force-length-time relationships for plastic are discussed which have been found useful for predicting the conditions of tensile failure. More complicated relationships of particular interest provide for the possibility of force-time superposition of creep curves. Published creep data are considered from this point of view.
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