Characteristics Evaluation of CFRP Composite Laminates Using a Through-Transmission Method of Ultrasonic Transducers

초음파 트랜스듀셔 투과법을 이용한 CFRP 복합적층판의 특성평가

  • 임광희 (우석대학교 자동차공학과) ;
  • 나승우 (조선대학교 대학원) ;
  • 강태식 (조선대학교 대학원) ;
  • 김선규 (익산대학 자동차과) ;
  • 김지훈 (조선대학교 수송기계공장자동화연구센터) ;
  • 이현 (조선대학교 수송기계공장자동화연구센터) ;
  • 박제웅 (조선대학교 수송기계공장자동화연구센터) ;
  • 심재기 (조선대학교 수송기계공장자동화연구센터) ;
  • 양인영 (조선대학교 수송기계공장자동화연구센터) ;
  • Published : 2001.06.27

Abstract

When propagating the thickness direction of composite laminates ultrasound waves interacts strongly with the orientation and sequence of the plies in a layup. Also the layup orientation greatly influences its properties in a composite laminate. If one ply of the layup orientation is misaligned, it could result in the part being rejected and discarded. Now, most researchers cut a small coupon from the waste edge and use a microscope to optically verify the ply sequences on important parts. Those may add a substantial cost to the product since the test is both labor hard and performed after the part is cured. A nondestructive technique would be very beneficial, which could be used to test the part after curing and require less time than the optical test. Therefore we have developed, reduced, and implemented a novel ply-by-ply vector decomposition model for composite lam mates fabricated from unidirectional plies. This model decomposes the transmission of a linearly polarized ultrasound wave into orthogonal components through each ply of a laminate. It is found that a high probability shows between the model and tests developed in characterizing cured layups of the laminates.