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Environmental effects of silicone oil on tensile and fatigue properties of polystyrene
Author(s) -
Chen C. C.,
Morrow D. R.,
Sauer J. A.
Publication year - 1982
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.760220710
Subject(s) - materials science , silicone oil , composite material , viscosity , ultimate tensile strength , polystyrene , stress (linguistics) , tension (geology) , fracture (geology) , compression (physics) , polymer , philosophy , linguistics
A series of polished polystyrene specimens, coated with silicone oil, were tested in tension and in tension‐compression fatigue cycling at 21 Hz. Oils of four different viscosities, ranging from 5 cSt to 1000 cSt, were utilized. The craze initiation stress and the tensile fracture stress both increased with the increase of oil viscosity. For the 1000 cSt oil, the stress‐strain curve was essentially the same as that of an uncoated sample. The average lifetime to fracture in the fatigue tests depends upon the stress amplitude and on the oil viscosity. For the 1000 cSt oil, the fatigue behavior is similar to that of uncoated samples, except at high imposed stresses, where lifetime is somewhat lower. For the low viscosity oil, the average lifetime is from one to two decades less than for uncoated samples. Discussion is given of the influence of stress amplitude and oil viscosity on the test results and on the morphology of the fracture surfaces.