DOI QR코드

DOI QR Code

Measurement of Principal Stress Direction by Photoelastic Phase Shifting Method

광탄성 위상이동법을 이용한 주응력 방향 측정법

  • 김명수 (군산대학교 전자정보공학부) ;
  • 김환 (군산대학교 대학원 기계공학과) ;
  • 백태현 (군산대학교 기계공학부)
  • Published : 2004.12.01

Abstract

In photoelasticity, the directions of principal stresses are given by isoclinic fringe patterns. In this study, photoelastic theory is represented by Jones calculus and the photoelastic 8-step phase shifting method is described. A feasibility study using computer simulation is done to get isoclinics from photoelastic fringes of a circular disk under diametral compression. Fringe patterns of the disk are generated from the stress-optic law. The magnitudes of isoclinics obtained from the fringe patterns of computer simulation and experiment are compared with those of theory. The results are close between them. Then, the 8-step phase shifting method is applied to get distributions of isoclinics along the specified lines of a cuved beam plate under tensile load. Experimental results obtained from the phase shifting method were compared with those of finite element analysis (ANSYS). It is confirmed that measurement of isoclinic distributions is possible by use of photoelasitc phase shifting method.

Keywords

References

  1. Dally, J. W. and Riley, W. F., 1991, Experimental Stress Analysis, Second Ed., McGraw-Hill. Inc.
  2. Cloud, G. L., 1995, Optical Methods of Engineering Analysis, Cambridge University Press
  3. Baek, T. H. and Lee, J. C., 1994, 'Development of Image Processing Technique for Photoelastic Fringe Analysis,' Transactions of KSME (Korean), Vol. 18, No. 10, pp. 2577-2584
  4. Baek, T. H., Kim, M. S., Morimoto, Y. and Fujigaki, M., 2002, 'Separation of Isochromatics and Isoclinics from Photoelastic Fringes in a Circular Disk by Phase Measuring Technique', KSME International Journal, Vol. 16, No.2, pp. 1207-1213
  5. Theocaris, P. S. and Gdoutos, E. E., 1979, 'Matrix Theory of Photoelasticity,' Springer-Verlag Berlin Heidelberg
  6. Baek, T. H., Kim, M. S. and Cho, S. H., 2001, 'Simulation of Separating Isoclinics and Isochromatics from Photoelastic Fringes of Disk using 8-step Phase Shifting Methodollgy,' Journal of the Korean Society for Non-destructive Testing (Korean), Vol. 21, No. 2, pp. 189-196
  7. Quiroga, J. A. and Gonzales-Cano, A., 1997, 'Phase Measuring Algorithm for Extraction of Isochromatis of Photoelastic Fringe Patterns,' Applied Optics, Vol. 36, No.2, pp. 8397-8402 https://doi.org/10.1364/AO.36.008397
  8. Frocht, M. M.,, 1967, Photoelasticity, Vol. 1 and 2, John Wiley and Sons
  9. Baek, T. H., 'Development and Test of the Multi-purpose Polariscope', Proceedings of the Symposium, Novel Applications of Experimental Methods in Mechanics, Society for Experimental Mechanics, Inc. (June 2003), pp. 185-191
  10. Photoelastic Division, Measurement Group, Inc., Raleigh, NC, 27611, USA
  11. ANSYS, Inc., Southpointe, 275 Technology Drive, Canonsburg, PA 15317, USA