Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
권호 표지
DOI QR코드

DOI QR Code

Corner Inspection of Autoclave-cured L-shaped Composite Structure using Pulse-echo Rotation Scanning Scheme based on Laser Ultrasonic

레이저 초음파 기반 반사식 회전 검사 기법을 이용한 오토클레이브 가공 L 형 복합재 구조물의 모서리 검사

  • Lee, Young-Jun (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Jung-Ryul (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology) ;
  • Hong, Sung-Jin (Materials & Processes Team, Korea Aerospace Industries, LTD.)
  • Received : 2018.07.26
  • Accepted : 2018.09.14
  • Published : 2018.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, laser ultrasonic rotation scanning method was proposed to inspect and visualize defects in corner section of curved composite structure. L-shaped composite specimen with defects in its corner section were inspected using laser ultrasonic rotation scanning method. L-shaped specimens had artificial defects at three different depths to simulate delamination damage. All artificial defects were detected clearly in different time-of-flight according to their depths. Inspection result showed that the proposed method is suitable to inspect round corner section of curved composite structure without any special tools.

본 연구에서는 곡면 복합재 구조물의 모서리에 위치한 결함을 검사하고 가시화하기 위해 제안된 레이저 초음파 기반 회전식 검사 기법을 소개한다. 모서리 부위에 결함이 위치한 L 형 복합재 구조물을 레이저 초음파 기반 회전식 검사 기법을 이용하여 검사하였다. L 형 시편은 층간분리 손상을 모사하기 위해 각기 다른 세 가지 깊이에 위치한 인공 결함을 포함하고 있다. 모든 인공 결함이 각각의 위치한 깊이에 따라 다른 시간대에 선명하게 탐지되었다. 검사결과는 제안된 방법이 어떠한 특별한 도구 없이도 곡면 복합재 구조물의 모서리 부위의 검사에 적합하다는 것을 보여준다.

Keywords

References

  1. Kim, J.H., Han, J.S., Bae, B.H., Choi, J.H., and Kweon, J.H., "Manufacturing and Structural Analysis of Thick Composite Spar Using AFP Machine," Composite Research, Vol. 28, No. 4, 2015, pp. 212-218. https://doi.org/10.7234/composres.2015.28.4.212
  2. Ishikawa, T., Matsushima, M., and Hayashi, Y., "Comparison of Numerical Analysis of Linear and Post-Buckling Behavior of CFRP T-Stiffeners with Experimental Results," Advanced Composite Materials, vol. 7, no. 3, 1998, pp. 263-283.
  3. Stickler P.B., and Ramulu M., Experimental Study of Composite T-Joints under Tensile and Shear Loading," Advanced Composite Materials, Vol. 15, No. 2, 2006, pp. 193-210.
  4. Matsuo, T., Goto, T., and Takahashi, J., "Investigation about the Fracture Behavior and Strength in a Curved Section of CF/PP Composite by a Thin-Curved Beam Specimen," Advanced Composite Materials, Vol. 24, No. 3, 2015, pp. 249-268. https://doi.org/10.1080/09243046.2014.886754
  5. Nhut, P.T., and Yum, Y.J., "Experimental Investigation of the Effect of Manufacturing and Working Conditions on the Deformation of Laminated Composite Structures," Composites Research, Vol. 26, No. 4, 2013, pp. 265-272. https://doi.org/10.7234/composres.2013.26.4.265
  6. Habermehl, J., and Lamarre, A., "Ultrasonic Phased Array Tools for Composite Inspection during Maintenance and Manufacturing," Proceeding of the 17th World Conference on Nondestructive Testing, Shanghai, China, Oct. 2008, pp. 25-28.
  7. Xu, N., and Zhou, Z., "Numerical Simulation and Experiment for Inspection of Corner-Shaped Components Using Ultrasonic Phased Array," Ndt & E International, Vol. 63, 2014, pp. 28-34. https://doi.org/10.1016/j.ndteint.2014.01.005
  8. Scruby, C.B. and Drain, L.E., Laser Ultrasonics -Techniques and Applications, Adam Hilger, Bristol, UK, 1990.
  9. Paschotta, Rudiger. Field Guide to Laser Pulse Generation. Vol. 14, SPIE Press, Bellingham, 2008.
  10. Dubois, M., and Drake, T.E., Dubois, Marc, and Thomas E. Drak, "Evolution of Industrial Laser-ultrasonic Systems for the Inspection of Composites," Nondestructive Testing and Evaluation, Vol. 26, No. 3-4, 2011, pp. 213-228. https://doi.org/10.1080/10589759.2011.573552
  11. Lee, J.R., Ciang, C.C., Shin, H.J., Park, C.Y., and Yoon, D.J., "Laser Ultrasonic Propagation Imaging Method in the Frequency Domain Based on Wavelet Transformation," Optics and Lasers in Engineering, Vol. 49, No. 1, 2011, pp. 167-175. https://doi.org/10.1016/j.optlaseng.2010.07.008