J0406-4-3 管軸長さ方向に漸増した減肉欠陥のガイド波による検出感度(超音波計測・解析法の新展開(4))

抄録

Evaluations of axially increasing defects have been carried out with guided waves in 50A pipes. A piezoelectric ring shaped sensor was used to generate and detect the guided waves. Two types (rectangular and round) of defect shapes were evaluated in the experiments. Obtained amplitude was not monotonically increased but was fluctuated with the increase of axial length of the defect. The mechanism of this phenomenon minutely discussed.