微小表面疲労き裂の発生とき裂先端の自動認識

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書誌事項

タイトル別名
  • Recognition of Small Surface Fatigue Crack Initiation and Crack Tip.
  • ビショウ ヒョウメン ヒロウ キレツ ノ ハッセイ ト キレツ センタン ノ

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抄録

A radiated projection method (RPM) has been applied to the detection of small surface fatigue cracks which initiate during a low cycle push-pull fatigue test. RPM is one object recognition algorithm which detects only specified objects by representing their features such as size, shape, and color or shade into the radiated frames geometrically. Observed images involve so many regions similar to the local part of the crack that it is difficult to detect small cracks by the simple thresholding method based on a certain intensity level at the crack, or by the edge detection method based on the intensity level change at the crack edge. The result is successful in detecting a small crack initiated at the edge of a small hole. Also the crack tip position is detected by RPM in order to measure its precise length. The result is also successful in detecting the crack tip position at the same place by visual inspection. Their algorithms are presented and the effective usage of RPM is discussed.

収録刊行物

  • 材料

    材料 42 (481), 1231-1237, 1993

    公益社団法人 日本材料学会

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