Accession Number:

AD0432443

Title:

THE MOIRE METHOD IN THERMAL FIELDS,

Descriptive Note:

Corporate Author:

NATIONAL TECHNICAL UNIV ATHENS (GREECE)

Personal Author(s):

Report Date:

1943-01-01

Pagination or Media Count:

21.0

Abstract:

The differential moire method was used for the analysis of strains and stresses in externally loaded bodies at elevated temperatures. A technique was developed to reproduce a crossed grating of a density of 500 lines per inch on the surface of the specimens in both principal directions. This grating resisted temperatures up to the glowing point of the material tested. An arrangement of cameras allows full scale copying of the crossed model grating on the ground glass of a camera. Mechanical interference patterns in both directions were obtained by superimposing various linear master gratings on the image of the model grating. The moire fringes produced in both principal directions of the specimen with master gratings of slightly different pitch were photographed by a second camera. These fringes yielded the displacement distribution of the specimen with great accuracy. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE