Application of a Thermodynamically Based Single Integral Constitutive Equation to Stress Relaxation and Yield in ABS
The main variation in linear viscoelastic time-dependent properties at different temperatures can be incorporated into the time scale.1 When properties are a function of stress and strain — termed non-linear viscoelastic — it is often possible to use modulus and time scaling with respect to these variables.2,3 The analytical framework supplied by Schapery’s single integral constitutive equation based on a thermodynamic theory,3,4,5 provides a rational approach to the characterization of linear and non-linear viscoelastic behavior. Initially developed in a generalized three-dimensional form,5 simplified uniaxial forms have been frequently used in polymer characterization.2,6
KeywordsStress Relaxation Relaxation Modulus Constant Crosshead Speed Stress Relaxation Data Nonlinear Viscoelastic Material
Unable to display preview. Download preview PDF.
- 1.Ferry, J. D.: Viscoelastic Properties of Polymers, John Wiley & Sons, Inc., New York, 1969.Google Scholar
- 5.Schapery, R. A.: “A Theory of Nonlinear Thermoviscoelasticity Based on Irreversible Thermodynamics,” Proc. of the Fifth U.S. National Congress of Applied Mechanics, ASME, 1966, pp. 511–530.Google Scholar
- 6.Aloisio, C. J.: The Application of a Nonlinear Viscoelastic Theory to the Characterization of an ABS Plastic. Ph.D. Thesis Purdue University, June, 1970.Google Scholar
- 7.DeGroot, S. R.: Thermodynamics of Irreversible Processes, North-Holland Publishing Co., Amsterdam, 1951.Google Scholar