Scitation | Help | Feedback
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

You are not logged in You are not logged in to this journal. Log In

Journal of Rheology / Volume 46 / Issue 4

J. Rheol. 46, 901 (2002); http://dx.doi.org/10.1122/1.1475980 (25 pages)

Nonlinear viscoelastic analysis of the torque, axial normal force and volume change measured simultaneously in the National Institute of Standards and Technology torsional dilatometer

Carl R. Schultheisz

Polymers Division, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8544, Gaithersburg, Maryland 20899-8544

Gregory B. McKenna

Department of Chemical Engineering, Texas Tech University, P.O. Box 43121, Lubbock, Texas 79409-3121

Full Text: Read Online (HTML) | Download PDF | Buy PDF (US$28) | View Cart
For compressible materials, the mechanical response to a torsional deformation (at sufficiently large levels of deformation) includes the nonlinear effects of a compressive normal force along the axis of the cylinder and a radial expansion of the cylinder, in addition to the expected torque response. The National Institute of Standards and Technology torsional dilatometer [Duran and McKenna, (1990)] has been used to measure simultaneously the torque, the axial normal force, and the volume change in response to a torsional deformation. In stress-relaxation experiments with an epoxy cylinder just below its glass transition temperature, the torque and normal force decay monotonically, but the volume change associated with the torsion shows an extended relaxation behavior with significant nonmonotonic decay at the lowest temperature investigated. The measurements are modeled with a series solution for torsion of an elastic, compressible material [Murnaghan (1951)]. The elastic solution is adapted for viscoelastic behavior by assuming that isochronal data can be treated as equilibrium elastic data, following a suggestion of Rivlin (1956). © 2002 The Society of Rheology.

© 2002 The Society of Rheology

KEYWORDS and PACS

Keywords

torque measurement, torsion, extensometers, volume measurement, stress relaxation, glass transition, polymers, viscoelasticity, Torsional dilatometer, Solid, viscoelastic

PACS

  • 07.10.Pz

    Instruments for strain, force, and torque

  • 83.85.St

    Stress relaxation

  • 83.60.Df

    Nonlinear viscoelasticity

  • 81.05.Lg

    Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials

PUBLICATION DATA

ISSN

0148-6055 (print)  

Publisher

The Society of Rheology

RELATED DATABASES

To view database links for this article, you need to log in.

ARTICLE DATA

History
Received 18 Sep 01
Revised 01 Mar 02
Digital Object Identifier
http://dx.doi.org/10.1122/1.1475980

For access to fully linked references, you need to log in.

For access to citing articles, you need to log in.



Close
   

Your Recent History Recent History Help

Recently Viewed

  1. Nonlinear viscoelastic analysis of the torque, axial normal force and volume change measured simultaneously in the National Institute of Standards and Technology torsional dilatometer
©  The Society of Rheology
close