Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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The Wave Propagation in Transversely Isotropic Composite Laminates

가로 등방성 복합재료의 초음파에 관한 연구

  • Published : 2006.06.01
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Abstract

In transversely isotropic composite laminates, the velocities, the particle directions and the amplitudes of reflected and transmitted waves were obtained using the equation of motion, the constitutive equation, and the displacement equation expressed by wave number and frequency. Eigenvalue problem involving a velocity was solved by Snell's law. Finally, the results were confirmed by 7300 Carbon fiber/5208 Epoxy materials. This approach could be applied to the detection of flaws in transversely isotropic composite laminates by the water immersion C-scan procedure.

가로 등방성 복합재료에서 반사되거나 굴절된 파동의 속도와 입자방향, 그리고 진폭을 운동방정식과 구성방정식 그리고 파동수와 진동수로 표현된 변위식을 사용하여 구하였다. Snell 법칙을 사용하여 Eigenvalue 문제를 풀어 파동속도를 구하였으며 그 결과는 T300 Carbon fiber/5208 Epoxy 재료 성질을 이용하여 검증하였다. 이러한 분석은 수분 침수 C-scan을 이용하여 가로등방성 복합재료의 결점을 찾아내는데 응용될 수 있다.

Keywords

References

  1. Kline, R. A. "The Origin of Localized Weak in SMC Composites," Materials Evaluation, Vol. 40, 1982, pp.847-879
  2. Kriz, R. D., and W. W. Stinchcomb, "Elastic Moduli of Transversely Isotropic Graphite Fibers and Their Composites," Experimental Mechanics, Vol. 19, 1979, pp. 41-49 https://doi.org/10.1007/BF02324524
  3. Hyungwon Kim, and Youngkyu Choi, "The Study on Axisymmetric Deformation of Thin Orthotropic Composite Pressure Vessel," J. of KSPE, Vol. 7, 2003, pp.36-43
  4. Zimmer, J. E., and J. R. Cost., "Determination of the Elastic Constants of Unidirectional Fiber Composites Using Ultrasonic Velocity Measurements," J. Acoustic. Soc. Am, Vol. 41, 1970, pp.795-799
  5. Dean, G. D., and P. Turner, "The Elastic Properties of Carbon Fibers and Their Composites," Composites, Vol.4, 1973, pp.174-180 https://doi.org/10.1016/0010-4361(73)90109-2