Al平板の疲労過程における超音波因子の変化(OS9-3 超音波計測I,OS9 材料損傷・劣化過程の非破壊診断技術)

概要

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A local immersion method of the ultrasonic measurement was applied to real-time measurement of the ultrasonic parameters for aluminum alloy (A2024-T3) specimens with curved sides during low-cycle fatigue testing. From the Fourier spectrum of the bottom echo, the peak intensity, the peak frequency and the average gradient of the transfer function were obtained. The peak intensity and the average gradient of the transfer function rapidly increased with increasing number of fatigue cycles at the initial stage, and then gradually increased to converge to the maximum in the later stage of the fatigue, but no change in the peak frequency. The Vickers hardness, the dislocation density and structure were investigated for the specimens taken out from the fatigue tester after required cycles.
一般社団法人日本機械学会の論文
2004-07-20