A Study on Measurement of Crack Length by using Laser Speckle Interferometry

레이저 스페클 간섭을 이용한 균열 길이 측정에 관한 연구

  • 강영준 (전북대학교 기계공학부) ;
  • 배진길 (전북대학교 기계설계학과 대학원) ;
  • 유원재 (전북대학교 기계설계학과 대학원) ;
  • 박난규 (전북대학교 기계설계학과 대학원)
  • Published : 2001.05.01

Abstract

More accurate and fast inspection method for mechanical parts and structure is required to guarantee the safety. Conventional methods using compliance method, eddy current method, ultrasonic wave, acoustic emission for non-destructive testing in mechanical parts and structure have been performed as the method of contact with objects to be inspected. With this reason these methods have been taken relatively much time, money, and manpower. In this study, in order to overcome these shortcomings, we used In-plane Electronic Speckle pattern Interferometry(In-plane ESPI) that was full-field measurement and noncontact method. We detected the cracks of the specimen at a real time and measured the length of the crack by using In-place ESPI system. Finally, we compared this results with conventional microscope method.

Keywords

References

  1. Jones, R. and Wykes, C., 'Holographic and Speckle Interferometry,' Cambridge University press, 1989
  2. Hansen, E. A., 'A Holographic Real Time Study of Crack Propagation in Concrete,' CEMENT and CONCRETE RESEARCH, Vol. 19, pp. 611-620 https://doi.org/10.1016/0008-8846(89)90013-6
  3. Maji, A. K. and Shah, S. P., 'Measurement of Mixed-mode Crack Profile by Holographic Interferometry,' Experimental Mechanics, 1990 https://doi.org/10.1007/BF02410249
  4. Bosco, C., Cadoni, E. and Facchini, M., 'Crack Propagation in Clay Elements Determined by ESPI Method,' SPIE, Vol. 2791, pp. 108-114, 1996 https://doi.org/10.1117/12.242095
  5. Jia, Z. and Shah, S. P., 'Crack Detection in Concrete Using Real-Time ESPI Technology,' SPIE Vol. 2455, pp. 385-391, 1995 https://doi.org/10.1117/12.213554
  6. Bosco, C., Cadoni, E. and Facchini, M., 'Interferometric Technique to Evaluate Strain Concentration at Crack Tip in Clay Products,' 4th International Masonry Conference, London, pp. 23-25, 1995
  7. Maji, A. K., Wang, J., 'Fracture Mechanics of a Tension-shear Macrocrack in Rocks,' Experimental Mechanics, pp. 190-196, 1992 https://doi.org/10.1007/BF02324732