Composites Research

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

DOI QR Code

Crack Detection of Composite Cylinders under external pressure using the Acoustic Emission

AE 기법을 이용한 외부수압을 받는 복합재 원통의 균열 검출

  • 박진하 (경상대학교 항공우주특성화 대학원) ;
  • 최진호 (경상대학교 기계공학부, 항공기부품기술연구소) ;
  • 권진회 (경상대학교 항공우주시스템공학과, 항공기부품기술연구소)
  • Published : 2011.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

The studies on the non-destructive testing methods of the composite materials are very important for improving their reliability and safety. AE(Acoustic Emission) can evaluate the defects by detecting the emitting strain energy when elastic waves are generated by the generation and growth of a crack, plastic deformation, fiber breakage, matrix cleavage or delamination. In this paper, the AE signals of the filament wound composite cylinder and sandwich cylinder during the pressure test were measured and analyzed. The signal characteristics of PVDF sensors were measured, and an AE signal analyzer which had the band-pass filter and L-C resonance filter were designed and fabricated. Also, the crack detection capability of the fabricated AE signal analyzer wes evaluated during the pressure tests of the filament wound composite cylinder and the sandwich cylinder.

복합재료의 비파괴 검사 방법에 관한 연구는 복합재료의 신뢰성 및 안전성을 개선시키는데 매우 중요하다. AE기법은 소성변형, 섬유파손, 모재균열 또는 박리에 의해 생성되는 탄성파에서 감지되는 변형 에너지를 감지하여 결함을 평가하는 기법이다. 본 논문에서는 외부 수압을 받는 필라멘트 와인딩 복합재 원통과 샌드위치 원통의 수압시험이 수행되었고, PVDF센서로부터 측정된 AE 신호특성을 분석하였다. 또한, L-C 동조회로와 Band-pass filter 회로를 가진 AE 신호분석기를 설계, 제작 하였으며, 필라멘트 와인딩 원통과 샌드위치 원통에 대한 수압실험에서 제작된 AE 신호분석기의 균열 검출 능력을 평가하였다.

Keywords

Acknowledgement

Supported by : NRF, DRC, KRCF

References

  1. Reinhart J. J (Eds), Composite, SM International, Vol. 1, 1987 pp. 479-495
  2. Masters J. E (Eds), Damage detection in composite materials, In, "Examination of selected NDF techniques for ceramic composite components"(Dunyak T. J, Stinchcomb W. W and Reifsnider), ATSM, STP 1128, 1992, pp. 3-24.
  3. Masters J. E (Eds), 1992, Damage detection in composite materials, In "Application of X-ray tomography to the nondestructive testing of high-performance polymer composite",(Bathias C, Cagnasso A) ASTM, STP 1128 : pp. 35-54.
  4. Masters J. E (Eds), Damage detection in composite materials, In "Defect classifications in composites using ultrasonic nondestructive avaluation techniques",(Steiner K. V), ASTM, STP 1128, 1992, pp. 72-84.
  5. Chen J. Y, Hoa V, Jen C. K and Wang H. W, "fiber-optic and ultrasonic measurements for In-situ cure monitoring of graphite /epoxy composites," Journal of Composite Materials, Vol. 33, No. 20, 1999, pp. 1860-1881. https://doi.org/10.1177/002199839903302001
  6. Takeda, Chen N. O and Kishi T. "Acoustic emission studies on fracture mechanisms of randomly Oriented carbon fiber reinforced glass matrix composite," The 10th International Acoustic Emission Symposium, 1990, pp, 394-400.
  7. Yu Y. H, Choi J. H, Kweon J. W and Kim D. H, "A study on the failure detection of composite materials using an acoustic emission", Journal of Composite Structures, Vol. 75, 2006, pp. 163-169. https://doi.org/10.1016/j.compstruct.2006.04.070
  8. Asher R. C. 1997, "Ultrasonic sensors for chemical and process plant", Institute of physics publishing bristol and philadelphia, pp. 311-320.
  9. 우성충, 최낙삼, "음향방출법을 이용한 편측노치를 갖는 유리 섬유/알루미늄 적층판의 파괴거동 해석," 한국복합재료학회지 Vol. 18, No.2, 2005, pp. 1-12.
  10. Narisawa I and Oba H., "An evaluation of acoustic emission from fiber-rein-forced composites," Journal of materials Science, Vol. 19, 1984, pp. 1777-1786. https://doi.org/10.1007/BF00550247
  11. 이창훈, 최진호, 권진회, "Acoustic Emission(AE)을 이용한 복합재료 구조물의 비파괴 특성 연구," 한국복합재료학회 2004년도 춘계학술발표대회 논문집, 2004, APr. 01, pp. 139-142.