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The effect of strain rate on the stress–strain curve of oriented polymers. I. Presentation of experimental results
Author(s) -
Hall I. H.
Publication year - 1968
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1968.070120411
Subject(s) - materials science , strain rate , strain (injury) , composite material , yield (engineering) , stress (linguistics) , polyacrylonitrile , polymer , strain energy , stress–strain curve , viscose , nylon 6 , atmospheric temperature range , stress relaxation , deformation (meteorology) , creep , thermodynamics , medicine , linguistics , philosophy , physics , finite element method
The stress‐strain curves of viscose, nylon 6.6, poly(ethylene terephthalate), polyacrylonitrile, and polypropylene have been determined at a large number of different strain rates between 10 −4 and 330 sec. −1 . The shape of these stress‐strain curves and its change with strain rate is shown to depend upon whether the material is tested above or below its glass temperature. The stress‐strain curves of materials tested below their glass temperature consists of an initial straight portion followed by a yield point at a few per cent strain. The breaking strain is only slightly affected by strain rate, and the energy to rupture increases with increasing rate. For materials tested above their glass temperature the initial portion of the stress‐strain curves in nonlinear, and the yield strain is much higher than for the other materials. There is a small range of strain rate, in which the breaking strain falls sharply to the yield strain with increasing rate, and the energy to rupture also decreases. Outside this range the energy to rupture increases with increasing rate.