疲労損傷に伴う転位挙動の超音波スペクトロスコピーによる評価

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  • Evaluation of Dislocation Behavior Due to Fatigue Damage Using Ultrasonic Spectroscopy.
  • ヒロウ ソンショウ ニ トモナウ テンイ キョドウ ノ チョウオンパ スペクトロスコピー ニ ヨル ヒョウカ

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The dislocation behavior, i.e. density of mobile dislocation and eigen-frequency of dislocation strings, are closely related to fatigue damage of materials. We can estimate the density of mobile dislocation under fatigue process by measuring ultrasonic wave velocities with three-different propagating frequencies via Granato-Lucke's dislocation string theory. In the present paper, the correlation of the mobile dislocation density with fatigue damages both of aluminum alloy and chromium-molybdenum alloy steels was examined. The results obtained are as follows. The ultrasonic wave velocities with three-different propagating frequencies (5, 10 and 15 MHz) decreased due to increasing of number of fatigue cycles in the both cases of aluminum alloy and chromium-molybdenum alloy steel. The density of mobile dislocation in the both cases estimated by Granato-Lucke's model increased in the fatigue damage progress.

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