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Nondestructive evaluation of fatigue-induced changes in the structure of composites by an ultrasonic method using a laser

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Mechanics of Composite Materials Aims and scope

Abstract

Studies were conducted to nondestructively evaluate the damage to a glass-fiber-reinforced plastic during cyclic and static loading. The evaluation was made by an ultrasonic method employing a laser. In both the unloaded and loaded specimens, the ultrasound attenuation spectrum has a resonance peak attributable to the periodic nature of the structure of the composite. This peak is shifted to the low-frequency region during static loading, due to a decrease in the elastic modulus. The spectra obtained after cyclic loading have no resonance peaks, due to attenuation of the ultrasound over a broad range of frequencies by a large number of fatigue cracks. Additional static loading results in concentration of the cracks near the boundary between the glass fibers and the polymer matrix, which leads to the formation of a resonance peak in the high-frequency region of the spectrum.

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References

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Authors
  1. A. A. Karabutov
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  2. N. B. Podymova
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Additional information

Translated from Mekhanika Kompozitnykh Materialov, Vol. 31, No. 3, pp. 405–410, May–June, 1995.

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Karabutov, A.A., Podymova, N.B. Nondestructive evaluation of fatigue-induced changes in the structure of composites by an ultrasonic method using a laser. Mech Compos Mater 31, 301–304 (1995). https://doi.org/10.1007/BF00615645

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  • DOI: https://doi.org/10.1007/BF00615645

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