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Mechanical properties of certain oriented crystalline polymers
Author(s) -
Starkweather Howard W.,
Jordan Thomas F.,
Dunnington Gordon B.
Publication year - 1974
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.760141003
Subject(s) - materials science , creep , composite material , polymer , deformation (meteorology) , yield (engineering) , stress relaxation , stress (linguistics) , ultimate tensile strength , uniaxial tension , relaxation (psychology) , instability , mechanics , psychology , social psychology , philosophy , linguistics , physics
The yield stress is a simple function of the deformation ratio in the direction of testing for specimens oriented by uniaxial or biaxial stretching or rolling. Unless the yield stress increases more rapidly than in proportion to the deformation ratio, there will be instability during tensile creep under high loads. The relative merit of various polymers differs for creep and stress relaxation. Fatigue and bend recovery are also related to the molecular structure.