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A fatigue test for controlling the quality of polyethylene copolymers
Author(s) -
Zhou Y.,
Lu X.,
Brown Norman
Publication year - 1991
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.760311005
Subject(s) - materials science , copolymer , constant (computer programming) , composite material , ultimate tensile strength , polyethylene , paris' law , melt flow index , linear low density polyethylene , fatigue testing , ethylene , fracture mechanics , crack closure , polymer , computer science , organic chemistry , catalysis , programming language , chemistry
The lifetimes of 17 commercial ethylene‐hexene copolymers were measured under fatigue and constant load. These LLDPE resins all had about the same melt flow index and density, but their lifetimes under fatigue and constant load varied by factors of 17 to 10 4 , respectively. The lifetimes in fatigue were 1/25 to 1/2000 times the lifetime under constant load, but the ranking of the resins in fatigue with respect to their resistance to slow crack growth correlated with the ranking under a constant load. It is recommended that a tensile fatigue test on a notched specimen is a useful short time test for the quality control of ethylenehexene copolymers that may be used for gas pipes or other critical applications.