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Titolo:
A random distribution (spectrum) of mechanical relaxation/retardation rateconstants and its influence on tensile strength of imperfect (real, visco-elastic) polymer fibers in constant strain-rate extension
Autore:
Smith, KJ;
Indirizzi:
SUNY Syracuse, Coll Environm Sci & Forestry, Dept Chem, Syracuse, NY 13210USA SUNY Syracuse Syracuse NY USA 13210 try, Dept Chem, Syracuse, NY 13210USA
Titolo Testata:
POLYMER
fascicolo: 2, volume: 43, anno: 2002,
pagine: 583 - 590
SICI:
0032-3861(200201)43:2<583:ARD(OM>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
BREAKING STRENGTH; POLYETHYLENE FIBERS; THERMODYNAMICS; MODULUS;
Keywords:
fiber strength; failure work; modulus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Smith, KJ SUNY Syracuse, Coll Environm Sci & Forestry, Dept Chem, Syracuse, NY 13210USA SUNY Syracuse Syracuse NY USA 13210 Chem, Syracuse, NY 13210USA
Citazione:
K.J. Smith, "A random distribution (spectrum) of mechanical relaxation/retardation rateconstants and its influence on tensile strength of imperfect (real, visco-elastic) polymer fibers in constant strain-rate extension", POLYMER, 43(2), 2002, pp. 583-590

Abstract

A random distribution of relaxation/retardation rate constants is derived and incorporated into the thermodynamic theory of strength of imperfect (real) polymer fibers, which is used to analyze empirical polyethylene (fiber)strength data. The results, weighted equally with previous results, give for the perfect polyethylene fiber - the only unique reference state - at 25degreesC: sigma (c)(strength) approximate to 7.5 GPa, K-c(modulus) approximate to 325 GPa, epsilon (c)(strain) approximate to 0.023, and W-c(failure work) approximate to 0.087 GPa. These numbers represent the best currently available for the characterization constants of a perfect fibrilliform single crystal of finite molecular weight polyethylene. The widths of uncertainty are ca. 15%. Also, these numbers are exactly those calculated with the thermodynamic theory of failure based on stress-induced fusion with a constant heat of fusion. Such figures indicate the general strength of the fusiontheory. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 30/03/20 alle ore 19:40:13