超音波アイソスキャン法による表面疲労き裂形状とき裂開閉口の測定

概要

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The ultrasonic isoscan technique using shear waves is employed to monitor the surface fatigue crack growth under a constant stress istensity range. It is shown that this technique has the potential to become an effective tool for quantitative surface fatigue crack growth characteristics. Not only can the three dimensional crack profile be continuously measured with fairly high accuracy during fatigue testing, but this study indicates that the crack tip closure can be detected at the maximum depth point and near the surface. The surface regions under plane-stress conditions are closed for a greater portion of the fatigue load cycle than the maximum depth point under a predominantly plane-strain condition. The plane strain crack tip opening load is smaller than the plane stress crack tip opening load.
社団法人日本機械学会の論文
1986-11-25