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Application of time‐temperature superposition principle to long term engineering properties of plastic materials
Author(s) -
Seitz J. T.,
Balazs C. F.
Publication year - 1968
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760080211
Subject(s) - materials science , creep , superposition principle , term (time) , time–temperature superposition , polystyrene , stress relaxation , composite material , natural rubber , relaxation (psychology) , structural engineering , viscoelasticity , polymer , mathematics , engineering , mathematical analysis , psychology , social psychology , physics , quantum mechanics
Time‐temperature equivalence was used to predict the long term engineering behavior of highly crystalline ethylene‐butene copolymers. The long term behavior (greater than 1000 hrs.) was accurately predicted from tests of short duration (30 hrs.). This time‐temperature principle was applied to stress‐relaxation and creep at stresses, strains and temperatures normally encountered in engineering practices. It was also used to solve a design problem involving the creep deformation of metal plastic laminates. Long term tests were performed to confirm the predicted results. This technique was not applicable to rubber modified polystyrene because of an unexpected transition at 88°F.