RELAXATION PROPERTIES OF POLYESTER BASED ON POLYURETHANE UNDER SMALL DEFORMATIONS SUPERPOSED ON LARGE DEFORMATIONS,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1967
- Accession Number
- AD0658328
Entities
People
- J. M. Klosner
- T. T. Wang
Organizations
- New York University Tandon School of Engineering