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26‐Year creep and recovery of poly(vinyl chloride) and polyethylene
Author(s) -
Findley William Nichols
Publication year - 1987
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.760270809
Subject(s) - creep , materials science , superposition principle , vinyl chloride , polyethylene , relative humidity , composite material , constant (computer programming) , stress (linguistics) , ultimate tensile strength , thermodynamics , polymer , mathematics , mathematical analysis , physics , linguistics , philosophy , computer science , copolymer , programming language
Creep experiments on two thermoplastics at constant values of tensile stress, temperature, and relative humidity previously reported for 132,000 h were continued to about 230,000 h. An equation of the form ϵ = ϵ o + ϵ + t n was used to predict the creep, where t is time and ϵ o , ϵ + , and n are constants for a given stress. ϵ o , ϵ + , and n were determined from the first 1900 h of data and were used to predict the creep to 230,000 h. The subsequent recovery on unloading was predicted using the same equation together with the superposition principle. Also reported are creep and recovery of companion specimens aged for about 98,000 h.