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THE APPLICATION OF HOLOGRAPHY TO STRESS ANALYSIS

APPLICATION DE L'HOLOGRAPHIE A L'ANALYSES DES CONTRAINTES

The evolution of civil engineering construction techniques has for some years past made possible the rapid development and building of complex structures. This relatively recent phenomenon has given rise to the use of new techniques for purposes of non-destructive testing. Among the numerous methods of investigation made available to potential users, optical methods of stress analysis occupy a prime position. These methods offer several advantages: The possibility of a finer examination of the behaviour of a stressed structure, without disturbing it, overall visualization of the phenomenon. (In a number of cases this qualitative characteristic enables certain special zones of the structure under study to be easily localized. (For example, accumulation of stresses)), and very high sensitivity. These methods do not replace existing methods of calculation, but they advantageously complement them by facilitating the exploitation of certain calculation results linked with initial hypotheses. The methods are generally used on reduced-scale models, and the cost is often less than that of full-scale tests. The advent of coherent optics, together with the use of lasers, has notably widened the field of application. Holography forms part of these methods. This work is a synthesis of stress analysis results obtained at the LCPC using this technique, notably in the civil engineering field. The qualitative applications of holography are numerous, but the quantitative aspect remains tricky in view of the restrictive conditions governing the use of the method. Nevertheless, subject to certain conditions it is possible to employ holographic interferometry for purposes of measurement, and this is what the author has done. The present report sets forth the principal results obtained in the application of this technique to problems of highway structures and pavements. /Author/

  • Corporate Authors:

    Central Laboratory of Bridges & Highways, France

    75732 Paris,   France 
  • Authors:
    • CAUSSIGNAC, J M
  • Publication Date: 1978-10

Language

  • French

Media Info

  • Features: Figures; References;
  • Pagination: 69 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00189337
  • Record Type: Publication
  • Source Agency: Central Laboratory of Bridges & Highways, France
  • Report/Paper Numbers: Res Rpt LPC No. 84
  • Files: ITRD, TRIS
  • Created Date: Mar 28 1979 12:00AM