Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Experimental Characterization of Cyclic Deformation in Copper Using Ultrasonic Nonlinearity

  • Kim, C.S. (Engineering Science and Mechanics, Pennsylvania State University) ;
  • Park, Ik-Keun (Department of Mechanical Engineering, Seoul National University of Technology) ;
  • Jhang, Kyung-Young (School of Mechanical Engineering, Hanyang University) ;
  • Kim, Noh-Yu (School of Mechatronics Engineering, Korea University of Technique & Education)
  • Published : 2008.06.30
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Abstract

We have experimentally investigated the cyclic deformation in copper using ultrasonic nonlinearity. The observation and characterization of dislocation substructure have been conducted using transmission electron microscope and electron backscattered diffraction technique. The ultrasonic nonlinearity (${\beta}/{\beta}_0$) was measured by the harmonic generation technique after various fatigue cycles. The microstructural effect on the nonlinearity was discussed regarding the extent of dislocation substructures evolved from low cycle fatigue. The ultrasonic nonlinearity of copper monotonically increased with the fatigue cycles due to the evolution of dislocation cell substructures.

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References

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