Accession Number:

AD0692589

Title:

PRODUCTION AND APPLICATION OF MODEL MATERIALS WITH DESIRED PHYSICAL CONSTANTS,

Descriptive Note:

Corporate Author:

TECHNICAL UNIV OF DENMARK COPENHAGEN STRUCTURAL RESEARCH LAB

Personal Author(s):

Report Date:

1968-01-01

Pagination or Media Count:

11.0

Abstract:

The report deals with problems related to the production of linear elastic isotropic materials with predetermined properties, for use in model tests. Two-component materials have been produced from Araldite B CT200 and air. The combination of these components provides a family of materials in which the modulus of elasticity and Poissons ratio vary with the air content. The physical constants measured are in reasonable agreement with values calculated by means of Budianskys expressions. The materials have the same mutual thermal expansion and the freezing properties known in three-dimensional photoelasticity. However, the air-entrained materials are opaque. At the freezing temperature, Poissons ratio is approx. 0.50 for the pure Araldite B, while it is 0.39 for a mixture with 34 air by volume. This means that the state of stress in the latter material can be determined by measuring the state of strain. This is used in the tests, the frozen 3-d state of strain at points of a simple model being measured on a 11000 mm dial gauge. The same technique is used on a composite model. Author

Subject Categories:

  • Plastics
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE