This paper shows that by the use of a new type of diffuser it is possible in photo-holoelasticimetry, without any addition of optical elements or particular preparation of the specimen, to record simultaneously but separately fringe patterns respectively related to the sum and the difference of the principal stresses. The value of intensity of the interfering light reaching the hologram plate is established and hence the equations of the recorded pseudoisopachic fringe patterns are given. Used successfully for the study of particular static problems, where numerical methods are very difficult or impossible, the present interferometer is also suited for dynamic problems.
Get full access to this article
View all access options for this article.
References
1.
O'ReganR.DudderarT. D.‘A New Holographic Interferometer for Stress Analysis’Experimental Mechanics, June 1971, 11, 6, 241–247.
2.
HovanesianJ. D.BrcicV.PowellR. L. A.New Experimental Stress-Optic Method: Stress-Holo-InterferometryExperimental Mechanics, August 1968, 8, 8, 362–368.
3.
NisidaM.SaitoH.‘A New Interferometric Method of Two-dimensional Stress Analysis’Experimental Mechanics, December 1964, 4, 12, 366–376.
4.
FourneyM. E.MateK. V.‘Further Applications of Holography to Photoelasticity’Experimental Mechanics, May 1970, 10, 5, 177–186.
5.
Pelzer-BawinG.De La MotteF.Interpretation géométrique de l'holographie, Applications en photoélasticimétrie. Laboratoire de photoélasticimétrie - Université de Liège, 1970.
6.
HollowayD. C.RansonW. F.TaylorC. E.‘A neoteric Interferometer for use in Holographic Photoelasticity’, Experimental Mechanics, October 1972, 12, 10, 461–465.
7.
GoodmanJ. W.‘Introduction to Fourier Optics, MacGraw-Hill Book Company, New York, 1968.
8.
PapoulisA.‘The Fourier Integral and its Applications’. MacGraw-Hill Book Company, New York, 1962.
9.
KochA.‘Détermination des isopaches par interférométrie: Un exemple d'application en génie civil’, Séminaire d'Analyse des Contraintes No. 9, Université Libre de Bruxelles.
10.
MariameA. M.‘Isopaches et isochromes étudiées par interférométrie holographique’, Mémoire de fin d’études - Université Libre de Bruxelles 1972.
11.
SanfordR. J.DurelliA. J.‘Interpretation of Fringes in Stress-Holo-Interferometry’Experimental Mechanics, April 1971, 11, 4, 161–166.
12.
KuskeA.RobertsonG.‘Photoelastic stress analysis’, John Wiley and Sons, London1974.
13.
HovanesianJ. D.‘Isochromatic Erasure in Photoholoelasticity’ Paper No. 2296A, 1974, SESA Spring Meeting, Detroit, Michigan, May 14–17, 1974.
