Journal of Mechanical Science and Technology

  • 제18권1호
  • /
  • Pages.65-73
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  • 2004
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  • 1738-494X(pISSN)
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  • 1976-3824(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지

Ultrasonic Characterization on Sequences of CFRP Composites Based on Modeling and Motorized System

  • Im, Kwang-Hee (Department of Automotive Eng., Woosuk University) ;
  • David K. Hsu (Center for Nondestructive Evaluation, Iowa State University) ;
  • Song, Sung-Jin (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Park, Je-Woung (Factory Automation Research Center for Parts of Vehicles and School of Mechanical Engineering, Chosun University) ;
  • Sim, Jae-Ki (Factory Automation Research Center for Parts of Vehicles and School of Mechanical Engineering, Chosun University) ;
  • Yang, In-Young (Factory Automation Research Center for Parts of Vehicles and School of Mechanical Engineering, Chosun University)
  • 발행 : 2004.01.01
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초록

Composites are a material class for which nondestructive material property characterization is as important as flaw detection. Laminates of fiber reinforced composites often possess strong in-plane elastic anisotropy attributable to the specific fiber orientation and layup sequence when waves are propagating in the thickness direction of composite laminates. So the layup orientation greatly influences its properties in a composite laminate. It could result in the part being .ejected and discarded if the layup orientation of a ply is misaligned. A nondestructive technique would be very beneficial, which could be used to test the part after curing and requires less time than the optical test. Therefore a ply-by-ply vector decomposition model has been developed, simplified, and implemented for composite laminates fabricated from unidirectional plies. This model decomposes the transmission of a linearly polarized ultrasound wave into orthogonal components through each ply of a laminate. Also in order to develop these methods into practical inspection tools, motorized system have been developed for different measurement modalities for acquiring ultrasonic signals as a function of in-plane angle. It is found that high probability shows between the model and tests developed in characterizing cured layups of the laminates.

키워드

참고문헌

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