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16‐Year creep of polyethylene and PVC
Author(s) -
Findley William Nichols,
Tracy Joseph Francis
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.760140807
Subject(s) - creep , materials science , polyethylene , superposition principle , vinyl chloride , relative humidity , composite material , constant (computer programming) , ultimate tensile strength , polyvinyl chloride , boltzmann constant , stress (linguistics) , thermodynamics , polymer , mathematics , mathematical analysis , physics , linguistics , philosophy , computer science , copolymer , programming language
Creep tests at constant values of tensile stress, temperature, and relative humidity for two thermoplastics were conducted for approximately 132,000 hr. The strains, ϵ, for the first 2000 hr of time, t , were described by an equation of the form ϵ = ϵ o + ϵ + t n where all other symbols are constants. This equation was found to predict the creep of poly(vinyl chloride) for approximately 132,000 hr with reasonable accuracy. The predicted strains for polyethylene (density 0.924) were somewhat low. Strains during unloading and reloading after 90,000 hr of creep were predicted reasonably well by the Boltzmann superposition principle.