Accession Number : AD0698829

Title :   A REVIEW OF SPECIAL TECHNIQUES FOR MEASURING PLASTIC STRAIN,

Corporate Author : ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT PARIS (FRANCE)

Personal Author(s) : Wilshaw,T. R.

Report Date : 1969

Pagination or Media Count : 34

Abstract : A review was made of strain measuring techniques other than transducer techniques, many of which are currently not widely known to engineers. The first section reviews surface strain and displacement techniques, grids, interferometry, hologram interferometry, moire fringes, photoelastic coatings and diffraction grating techniques. The second section reviews techniques for internal strain measurement, which include X-ray, microhardness, internal markers, dislocation etch pit and direct observation of dislocation techniques. In all cases accounts of the physical principles of the techniques are given and their applications and practical implications are discussed. Where possible the applications to strain distributions around notches and cracks have been presented as a common example for direct comparison. Finally, an attempt to compare the various techniques is made. (Author)

Descriptors :   (*DEFORMATION, TEST METHODS), MEASUREMENT, INTERFEROMETERS, PHOTOELASTICITY, SURFACE PROPERTIES, OPTICAL ANALYSIS, STRAIN GAGES, PHOTOGRAPHY, DIFFRACTION, DISLOCATIONS, HARDNESS, GREAT BRITAIN

Subject Categories : Test Facilities, Equipment and Methods
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE