ELEVATED TEMPERATURE CREEP OF POLYURETHANE UNDER NONLINEAR TORSIONAL STRESS WITH STEP CHANGES IN TORQUE

Abstract

Constant stress experiments, recovery and multi-step creep tests in torsion in the nonlinear range were performed at different temperatures up to 160F. It was found that the results could be described by a power function of time whose exponent was independent of stress and temperature. Most of the temperature effect and most of the nonlinearity were found in the coefficient of the time-dependent term. The nonlinearity was described by the multiple integral representation, and the changes in stress were adequately predicted by the modified superposition method, except at the highest temperatures.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1970
Accession Number
AD0710409

Entities

People

  • J. S. Lai
  • W. N. Findley

Organizations

  • Brown University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Civil Engineering
  • Coefficients
  • Constitutive Equations
  • Creep
  • Creep Tests
  • Engineering
  • Equations
  • High Temperature
  • Integrals
  • Internal Pressure
  • Kernel Functions
  • Materials
  • Materials Science
  • Plastics
  • Polyurethanes
  • Recovery
  • Stresses

Readers

  • Control Systems Engineering.
  • Mechanical Engineering/Mechanics of Materials.