S0302-3-4 鉄道用中ぐり車軸の超音波探傷における車輪はめ合い状態による影響評価([S0302-3]超音波非破壊評価の高精度化(3))

概要

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Regarding a hollow axle with a bore diameter of 40 mm, as developed for meter-gauge railway cars, we performed a full-scale rotating bending fatigue test on a hollow axle. Artificial flaws were previously machined on the wheel seat of the axle. We attempted to follow the echo height of artificial flaws by the in-situ ultrasonic testing during the fatigue test. Consequently, though the amount of the crack propagation from artificial flaws was negligible, the echo height altered widely according to the progress of the fatigue test. It was assumable that the transition of contact condition between the axle and wheel had affected to the reflection and transmission coefficient of ultrasonic angle beam, accordingly, the echo height altered.
2010-09-04