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Failure sensitivity of high density polyethylene in compression
Author(s) -
Clements Linda L.
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.760190216
Subject(s) - materials science , polyethylene , composite material , strain rate , high density polyethylene , strain (injury) , compression (physics) , tearing , melting temperature , relaxation (psychology) , melting point , tension (geology) , medicine , psychology , social psychology
As part of an investigation of the compressive mechanical behavior of high density polyethylene between room temperature and the crystalline melting temperature, the strain‐to‐failure as a function of temperature and strain rate was studied. The two resins studied in applied‐strain‐rate tests were found prone to fail, as judged by decreased strain‐to‐failure, at temperatures from 70 to 88°C. The strain‐to‐failure decreased as the temperature was increased or as the strain rate was decreased. This behavior is opposite to that observed in tension at lower temperatures. At temperatures just below melting, the strain‐to‐failure apparently began to increase again. By analogy to the results of tearing experiments on polyethylene and other thermoplastics, the findings are explained in terms of the influence of the α relaxation in polyethylene. Differences in the behavior of the two polyethylene resins were also examined.