Advertisement

Experimental Mechanics

, Volume 43, Issue 4, pp 403–409 | Cite as

A novel instrument for transient photoelasticity

  • J. W. Hobbs
  • R. J. Greene
  • E. A. Patterson
Article

Abstract

A new instrument has been developed for the photoelastic analysis of transient events. The instrument is based on the Phase-Stepped Images Obtained Simultaneously (PSIOS) system developed by Patterson and Wang, which enables four phase-stepped photoelastic images to be collected simultaneously. Where the new instrument differs is that the original instrument requires four cameras to collect the four images, whereas the new instrument requires only one camera. This makes the use of phase-stepping viable for events, in which the fringe order varies with time. Three examples are given of the use of the instrument in static and dynamic photoelasticity to generate full field maps of isochromatic fringes. The instrument has been found to work well and significantly increases the potential for the use of photoelasticity to study transient and possibly dynamic events.

Key Words

photoelasticity transient dynamic 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Muller, R.K. andSaackel, L.R., “Complete Automatic Analysis of Photoelastic Fringes,” EEXPERIMENTAL MECHANICS,19,245–251 (1979).Google Scholar
  2. 2.
    Umezaki, B., Tamaki, T. andTakahashi, S., “Automatic Stress Analysis From Photoelastic Fringes Due to Image Processing Using a Personal Computer,”Proc. Soc. Photography,504,127–134 (1984).Google Scholar
  3. 3.
    Voloshin, A.S. andBurger, C.P., “Half-Fringe Photoelasticity: A New Approach to Whole Field Analysis,” EXPERIMENTAL MECHANICS,23,304–314 (1983).CrossRefGoogle Scholar
  4. 4.
    Quan, C., Bryston-Cross, P.J. andJudge, T.R., “Photoelasticity Stress Analysis Using Carrier Fringe and FFT Techniques,”Optics and Lasers in Engineering,18,79–108 (1993).CrossRefGoogle Scholar
  5. 5.
    Morimoto, Y., Morimoto Jr., Y. andHayashi, T., “Separation of Isochromatics and Isoclinics Using Fourier Transform,”Experimental Techniques,18 (5),13–18 (1994).Google Scholar
  6. 6.
    Redner, A.S., “Photoelastic Measurement by Means of Computer Assisted Spectral-Contents Analysis,” Proceeding of 5th International Conference on Experimental Mechanics, Montreal, 421–427 (1984).Google Scholar
  7. 7.
    Sanford, R.J. and Iyengar, V., “The Measurement of the Complete Photoelastic Fringe Order Using a Spectral Scanner,” Proceedings of 1985 SEM Spring Conference on Experimental Mechanics, 160–168 (1985).Google Scholar
  8. 8.
    Haake, S.J. andPatterson, E.A., “Photoelastic Analysis of Frozen Stresses Specimens Using Spectral Contents Analysis,” EXPERIMENTAL MECHANICS,32,266–272 (1992).CrossRefGoogle Scholar
  9. 9.
    Ajovalasit, A., Barone, S. andPetrucci, G., “Towards RGB Photoelasticity: Full-Field Automated Photoelasticity in White Light,” EXPERIMENTAL MECHANICS,35 (3),193–200 (1995).CrossRefGoogle Scholar
  10. 10.
    Hecker, F.W. andMorche, B., “Computer Measurement of Relative Retardations in Plane Photoelasticity,”Experimental Stress Analysis, H. Weiringa, editor, Martinuus Nijhoff, Dordrecht, 532–542 (1986).Google Scholar
  11. 11.
    Kihara, T., “Automatic Whole-Field Measurement of Photoelasticity Using Linear Polarized Incident Light,”Proceedings of 9th International Conference on Experimental Mechanics, Copenhagen, Denmark, Vol.2, 821–827 (1990).Google Scholar
  12. 12.
    Patterson, E.A. andWang, Z.F., “Towards Full-Field Automated Photoelastic Analysis of Complex Components,”Strain,27 (2),49–56 (1991).Google Scholar
  13. 13.
    Patterson, E.A. andWang, Z.F., “Simultaneous Observation of Phase-Stepped Images for Automated Photoelasticity,”Journal of Strain Analysis,33 (5),400 (1998).Google Scholar
  14. 14.
    Ji, W. and Patterson, E.A., “Simulation of Errors in Automated Photoelasticity,” Proceedings of SEM Spring Conference on Experimental Mechanics, Bellevue, Washington, 315–316 (1997).Google Scholar
  15. 15.
    Wang, Z.F. andPatterson, E.A., “Use of Phase-Stepping With Demodulation and Fuzzy Sets for Birefringence Measurement,”Optics and Lasers in Enginering,22,91–104 (1995).Google Scholar
  16. 16.
    Den Hartog, J.P., Advanced Strength of Materials, Dover Publications, New York (1952).Google Scholar
  17. 17.
    Tomlinson, R.A. andPatterson, E.A., “Evaluating Characteristic Parameters in Integrated Photoelasticity,”Experimental Mechanics, I.M. Allison, editor, Balkema, Rotterdam, 495–500 (1998).Google Scholar
  18. 18.
    Haake, S.J., Wang, Z.F. andPatterson, E.A., “Evaluation of Full-Field Automated Photoelastic Analysis Based on Phase-Stepping,”Experimental Techniques,17 (6),19–25 (1993).Google Scholar
  19. 19.
    Ramesh, K. andGanapathy, V., “Phase-Shifting Methodologies in Photoelastic Analysis—The Application of Jones Calculus,”Journal of Strain Analysis,31 (6),423–432 (1996).Google Scholar

Copyright information

© Society for Experimental Mechanics 2003

Authors and Affiliations

  • J. W. Hobbs
    • 1
  • R. J. Greene
    • 1
  • E. A. Patterson
    • 2
  1. 1.Department of Mechanical EngineeringUniversity of SheffieldSheffieldUK
  2. 2.Health and Safety LaboratorySheffieldUK

Personalised recommendations