Nondestructive evaluation of degree of fiber waviness in thick composites

H. J. Chun, P. S. Jang

Research output: Contribution to journalConference article

Abstract

An experimental investigation was conducted nondestructively to evaluate the degree of fiber waviness in thick composite materials using ultrasonics. An analytical model, based on the ray and plane wave theories, was proposed to understand the ultrasonic wave propagation in composites with uniform fiber waviness. In the model, the composites were assumed to have continuous fibers with sinusoidal waviness in a matrix. The experiments were conducted on the specially fabricated thick composite specimens with various degrees of uniform fiber waviness using the conventional through-transmission method. For the given positions of transmitter, the locations of receiver with the maximum energy of received wave were measured along with the traveling time of the wave. From these and conjugated results from the analytical model, the paths of ultrasonic wave, wavelength of fiber waviness, concave and convex regions of fiber waviness and amplitude of fiber waviness were determined. Then, the nondestructively determined values were compared with the actual measurements obtained from the test specimens. Good agreements were observed among them.

Original languageEnglish
Pages (from-to)II/-
JournalKey Engineering Materials
Volume183
Publication statusPublished - 2000 Jan 1
Event4th International Conference on Fracture and Strength of Solids - Pohang, South Korea
Duration: 2000 Aug 162000 Aug 18

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Fibers
Composite materials
Analytical models
Ultrasonic propagation
Ultrasonic waves
Transmitters
Ultrasonics
Wavelength
Experiments

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "An experimental investigation was conducted nondestructively to evaluate the degree of fiber waviness in thick composite materials using ultrasonics. An analytical model, based on the ray and plane wave theories, was proposed to understand the ultrasonic wave propagation in composites with uniform fiber waviness. In the model, the composites were assumed to have continuous fibers with sinusoidal waviness in a matrix. The experiments were conducted on the specially fabricated thick composite specimens with various degrees of uniform fiber waviness using the conventional through-transmission method. For the given positions of transmitter, the locations of receiver with the maximum energy of received wave were measured along with the traveling time of the wave. From these and conjugated results from the analytical model, the paths of ultrasonic wave, wavelength of fiber waviness, concave and convex regions of fiber waviness and amplitude of fiber waviness were determined. Then, the nondestructively determined values were compared with the actual measurements obtained from the test specimens. Good agreements were observed among them.",
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Nondestructive evaluation of degree of fiber waviness in thick composites. / Chun, H. J.; Jang, P. S.

In: Key Engineering Materials, Vol. 183, 01.01.2000, p. II/-.

Research output: Contribution to journalConference article

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N2 - An experimental investigation was conducted nondestructively to evaluate the degree of fiber waviness in thick composite materials using ultrasonics. An analytical model, based on the ray and plane wave theories, was proposed to understand the ultrasonic wave propagation in composites with uniform fiber waviness. In the model, the composites were assumed to have continuous fibers with sinusoidal waviness in a matrix. The experiments were conducted on the specially fabricated thick composite specimens with various degrees of uniform fiber waviness using the conventional through-transmission method. For the given positions of transmitter, the locations of receiver with the maximum energy of received wave were measured along with the traveling time of the wave. From these and conjugated results from the analytical model, the paths of ultrasonic wave, wavelength of fiber waviness, concave and convex regions of fiber waviness and amplitude of fiber waviness were determined. Then, the nondestructively determined values were compared with the actual measurements obtained from the test specimens. Good agreements were observed among them.

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