Accession Number:

ADA022613

Title:

Photomechanics Methods for Inelastic Stress Analysis.

Descriptive Note:

Final rept. 1 Feb 74-31 Jan 76,

Corporate Author:

IOWA STATE UNIV AMES ENGINEERING RESEARCH INST

Personal Author(s):

Report Date:

1976-03-01

Pagination or Media Count:

65.0

Abstract:

In this report, complete mechanical and optical properties are presented for a polyester material which is suitable for model studies in the inelastic range of material response. Data from a series of uniaxial tensile and compressive tests, together with data from a series of pressurized thin-walled cylinder tests, indicates that the fringe order at a point in the material is a function of the instantaneous principal strain difference at the point. Under load, the function is non-linear and multi-valued. Upon removal of the load, however, the retained fringe order is a single-valued linear function of the principal strain difference. Data from the uniaxial and cylinder tests also indicates that the material follows a modified von Mises yield criterion which accounts for differences in tensile and compressive yield strengths.

Subject Categories:

  • Plastics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE