Characterization of CFRP Laminates′Layups Using Through-Transmitting Ultrasound Waves

  • Im, Kwang-Hee (Department of Automotive Engineering, Woosuk University) ;
  • David K. Hsu (Center for Nondestructive Evaluation, Iowa State University) ;
  • Cho, Young-Tae (Institute of Engineering and Technology, Jeonju University) ;
  • Park, Jae-Woung (Factory Automation Research Center for Parts of Vehicles) ;
  • Sim, Jae-Ki (Factory Automation Research Center for Parts of Vehicles) ;
  • Yang, In-Young (Factory Automation Research Center for Parts of Vehicles)
  • Published : 2002.03.01

Abstract

Ultrasound waves interact strongly with the orientation and sequence of the plies in a layup when propagating in the thickness direction of composite laminates. Also the layup orientation greatly influences its properties in a composite laminate. If the layup orientation of a ply 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. This may add a substantial cost to the production since the test is both labor intensive 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 requires less time than the optical test. Therefore we have developed, reduced, and implemented a novel ply-by-ply vector decomposition model 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. High probability is found, by comparisons between the model and tests, in characterizing cured layups of the laminates by using the proposed method.

References

  1. Hale R. D., Hsu D. K. and Adams D. O., 1996, 'Ultrasonic NDE Techniques and the Effects of Flaws on Mechanical Performance in Multi-Directionally Reinforced Textile Composite,' Review of Progress in Quantitative Nondestructive Evaluation, Vol. 15, Plenum Press, New York, pp. 1247-1254
  2. Hsu, D. K. and Margetan, F. J., 1993, 'Examining CFRP Laminate Layup with Contact- mode Ultrasonic Measurements,' Adv. Comp. Lett., Vol. 2, No. 2, pp. 51-55
  3. Hsu., D. K., 1994, 'Material Properties Characterization for Composites Using Ultrasonic Methods,' proceeding of Noise-Con 94, pp. 821-830
  4. Hsu, D. K., Fisher, B. A. and Koskamp, M., 1997, 'Shear wave Ultrasonic Technique as an NDE Tool for Composite Laminate Before and After Curing,' Review of Progress in Quantitative Nondestructive Evaluation, Vol. 16, D. O. Thompson and D. E. Chimenti editors, Plenum Press, New York, 1975-1982
  5. Im K. H., Kim S. K. and Yang I. Y., 1999, 'Impact Damage and Hygrothermal Effects on Fatigue Bending Strength of Orthotropy Composite Laminates,' KSME International Journal, Vol. 13, No. 7, pp. 524-535
  6. Komsky, I. N., Daniel I. M. and Lee C. -Y, 1992, 'Ultrasonic Determination of Layer Orientation in Multilayer Multidirectional Composite Laminates,' in Review of Progress in QNDE, Vol. eds. D. O. Thompson and D. E. Chimenti, Plenum, New York, pp. 1615-1622
  7. Komsky, I. N., Zgonc K., and Daniel I. M., 1994, 'Ultrasonic Determination of Layer Orientation in Composite Laminates Using Adaptive Signal Classifiers,' in Review of Progress in QNDE, Vol. 13, eds. D. O. Thompson and D. E. Chimenti, Plenum, New York, pp. 787-794
  8. Tippler, P. A., 1982, Physics, Second Edition, Worth, New York, pp. 863-870
  9. Urabe, K. and Yomoda S., 1982, 'Non-Destructive Testing Method of Fiber Orientation and Fiber Content in FRP Using Microwave,' in Progress in Science and Engineering of Composites, eds. T. Hayashi, K. Kawata, and S. Umekawa, Japan Society for Composite Materials, Tokyo, pp. 1543-1550
  10. Urabe, K. and Yomoda S., 1987, 'Nondestructive Testing Method of Fiber Orientation in Fiber Reinforced Composites by Microwave,' Bulletin of Industrial Products Research Institute, No. 107, pp. 11-21
  11. Urabe, K., 1987, 'Rotative Polarization System of Millimetric Wave for Detection of Fiber Orientation in CFRP,' Bulletin of Industrial Products Research Institute, No. 107, pp. 23-31