Accession Number : AD0696558
Title : DIFFRACTION OF LIGHT BY A GRATING SUBJECTED TO HOMOGENEOUS STRAINS AND RIGID BODY ROTATIONS.
Descriptive Note : Technical rept.,
Corporate Author : NORTH CAROLINA STATE UNIV RALEIGH
Personal Author(s) : Blake,H. W. ; Stadelmaier,H. H. ; Douglas,R. A.
Report Date : OCT 1969
Pagination or Media Count : 245
Abstract : A general diffraction-strain theory is developed for the optical diffraction grating strain gages now being used to measure large dynamic strains in solids. General diffraction-strain equations are derived that relate the surface strains to observable changes in a diffraction pattern. Using the Laue diffraction theory, diffraction-strain equations for crossed grating strain gages are derived. Since the current use of the diffraction grating strain gage is to detect plastic strains produced by the axial impact of cylindrical rods, attention is devoted to the development of specific equations and optical configurations for experiments of this type. Several optical configurations for measuring either the axial or the circumferential strain component of the rod are proposed. (Author)
Descriptors : (*STRAIN GAGES, *DIFFRACTION GRATINGS), STRAIN(MECHANICS), DEFORMATION, ROTATION, RODS, CYLINDRICAL BODIES
Subject Categories : Optics
Distribution Statement : APPROVED FOR PUBLIC RELEASE