面内および面外曲げ荷重下における曲り管のクリープ疲労変形

概要

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Both completely reversed in-plane and out-of-plane bending fatigue tests were carried out at 900℃. The effects of the loading direction and the displacement rate on the deformation of a curved tube under creep-fatigue conditions at an elevated temperature were examined experimentally and analytically. A main crack was observed at the lower side of the elbow in the in-plane bending fatigue tests. In the out-of-plane bending fatigue tests, the main crack was observed at the side of the elbow and extended in the direction 45°to the axis of the test tube. The position and direction of the main crack were in fairly good agreement with those of the analytical results. The inelastic analyses were conducted using two types of the creep constitutive equation. A comparison between the predicted fracture lives based on analyses and the experimental results of the test tubes was undertaken.
一般社団法人日本機械学会の論文
1995-06-25