Obviously, the relationships of log G' ~ log [omega] and log G" ~ log [omega] depart from the quantitative description of log G' [infinity] 2 log [omega] and log G" [infinity] log [omega] given by linear viscoelastic theory
Iiioushin, The Approximation Method of Calculating the Constructures by Linear Thermal Viscoelastic Theory
In the linear viscoelastic theory
, creep and stress-relaxation curves are proportional.
This award perpetuates the memory of Melvin Mooney, the developer of viscoelastic theory
, the Mooney viscometer and other testing equipment, by honoring Rubber Division members and affiliate members who have exhibited exceptional technical competence by making significant and repeated contributions to rubber technology.
Based on viscoelastic theory
, a standard uniaxial linear viscoelastic solid model for creep under constant stress [[sigma].
7) obtained a nonlinear viscoelastic material model for medium density polyethylene based on tensile relaxation data using Schapery's nonlinear viscoelastic theory (8).
In viscoelastic theory, constitutive relations are usually formulated using either the integral form or the differential form (14).
Thus, there is a need for a nonlinear viscoelastic theory to effectively characterize the creep of a polymer.
Schapery's nonlinear viscoelastic theory has been derived from fundamental principles of irreversible thermodynamics, and has been successfully used in describing the behavior of polymers with and without fiber reinforcement (8, 10-21).
This result disagrees with the linear viscoelastic theory.
Moreover, contrary to often used continuous models, the Log-Normal law is in accord with the linear viscoelastic theory since it provides all the limiting values.
Comparison of Overstress Theory With Linear Viscoelastic Theory