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An instability leading to failure of polyethylene in uniaxial creep
Author(s) -
Zapas L. J.,
Crissman J. M.
Publication year - 1979
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.760190209
Subject(s) - creep , materials science , instability , polyethylene , composite material , uniaxial tension , high density polyethylene , work (physics) , mechanics , forensic engineering , thermodynamics , ultimate tensile strength , physics , engineering
Based on a continuum model, a point of instability is predicted for the uniaxial creep of high density polyethylene. From dead load experiments it has been found that the instability occurs for linear polyethylene at around 10–12 percent strain, depending upon molecular weight and molecular weight distribution. It is shown that in the range of applied stresses for which the specimens neck during uniaxial creep, the time required to reach the critical point is related by a constant factor to the time at which the neck appears. A synopsis of theoretical considerations, as well as experimental work in support of this idea, is given.