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Temperature‐dependent mechanical properties and constitutive equation of cellulose nitrate
Author(s) -
Nishitani T.,
Ogura H.
Publication year - 1989
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.760292207
Subject(s) - materials science , creep , constitutive equation , composite material , ultimate tensile strength , stress (linguistics) , thermodynamics , strain rate , nonlinear system , physics , linguistics , philosophy , finite element method , quantum mechanics
The strain‐time response under tensile loading (creep tests) and the stress strain response under constant tensile stress rate (proportional loading tests) have been evaluated at 4 temperatures 20, 45, 55, and 65°C, for samples of cellulose nitrate. A time‐dependent constitutive equation (or stress‐strain relation) for the nonlinear visco‐elastic material is deduced from invariant theory with a hypothesis of a creep potential. The procedure for determining the seven material constants involved in the deduced constitutive equation is described for the creep and proportional loading tests and the variation of these constants with temperature is presented. The deduced constitutive equation gives good agreement with the actual observations for the creep and proportional loading tests, independent of the values of temperature, creep stress, or stress rate.