Accession Number:

AD0658328

Title:

RELAXATION PROPERTIES OF POLYESTER BASED ON POLYURETHANE UNDER SMALL DEFORMATIONS SUPERPOSED ON LARGE DEFORMATIONS,

Descriptive Note:

Corporate Author:

POLYTECHNIC INST OF BROOKLYN N Y

Personal Author(s):

Report Date:

1967-07-01

Pagination or Media Count:

38.0

Abstract:

An investigation was carried out to determine the extensional mechanical behavior of a viscoelastic material when it is subject to an infinitestimal displacement field superposed on a finite steady deformation. Experiments were conducted on a thin strip of a polyester based polyurethane at a temperature of about 77 F. It is shown that the relaxation modulus of this material can be expressed as a product of two functions, one of which depends only upon the elongation ratio and the other only upon time. This form is applicable for basic state elongation rations 1 or lambda or 1.2 and for a period of two hours. It is noted that the separable form is highly suspect for longer time intervals. Author

Subject Categories:

  • Elastomers and Rubber
  • Mechanics
  • Solid Rocket Propellants

Distribution Statement:

APPROVED FOR PUBLIC RELEASE