Contact holographic interferometers for investigation of elastoplastic problems

S. I. Gerasimov, V. A. Zhiklin

Research output: Contribution to journalConference article

Abstract

A full understanding of the plastic zone formation in a stress concentration region of homogeneous and polycrystalline bodies, has long been a goal of researchers in experimental mechanics. Although some analytical and numerical models have been proposed to predict the formation of plastic zones, no satisfactory correlation has been obtained with experimental results due to the complexity of measurement procedures.1-3 The purpose of this paper is to develop a simple experimental technique to investigate strains and stresses in a plastic zone in engineering materials by using contact holographic interferometers. Contact holographic interferometer is presented as an assembly of the object, surface section and holographic plate in an immediate vicinity to the object.4,5 This technique is used to determine in-plane and out-of-plane displacements of the tested object. If a hologram is recorded at a metallized grating surface it restores information peculiar to some optical methods: holographic interferometry, speckle photography, holographic moiré and mirror-optical method. For the interpretation of interference patterns simple analytical equations are obtained. Contact holographic interferometers are used effectively to solve some elasto-plastic deformation measurement problems of isotropic and polycrystalline materials. It is specially designed to permit the accurate measurement of the in-plane component of strain in the immediate vicinity of stress concentrators in plates. Some research results of plane static and signvariable load elasto-plastic problems are considered.

Original languageEnglish
Pages (from-to)1246-1253
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4900
Issue number2
DOIs
Publication statusPublished - 1 Jan 2002
EventSeventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life - Novosibirsk, Russian Federation
Duration: 9 Sep 200213 Sep 2002

Keywords

  • Displacements measurements
  • Holographic interferometry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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