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High‐Temperature large‐strain behavior of polycarbonate, polyetherimide and poly(butylene terephthalate)
Author(s) -
Nied H. F.,
Stokes V. K.,
Ysseldyke D. A.
Publication year - 1987
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.760270114
Subject(s) - necking , polyetherimide , materials science , polycarbonate , composite material , deformation (meteorology) , polymer , atmospheric temperature range , thermodynamics , physics
A noncontacting experimental procedure has been used for characterizing the high‐temperature large‐strain uniaxial behavior of polycarbonate (PC), polyetherimide (PEI), and poly(butylene terephthalate) (PBT), through controlled tests on flat specimens cut from extruded sheet. While each of these polymers exhibits stable necking over a broad temperature range, the transition to the necked state is shown to be more gradual at higher temperatures, resulting in a less sharply defined neck transition region during the drawing process. These trends in necking behavior, and other phenomena such as double necking, which only occur at high temperatures, are illustrated through contour plots of the Cauchy‐Green deformation tensor. Elevated temperature true‐stress versus stretch data are given for each of these polymers.