OS1424 局部減肉を有するエルボ配管の低サイクル疲労破損挙動に及ぼす内圧の影響(エネルギー機器の経年劣化に関する健全性評価,オーガナイズドセッション)

概要

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Low cycle fatigue tests were conducted using 100A elbow specimens of STPT410 with local wall thinning. Local wall thinning was machined on the inside of elbow specimens in order to simulate erosion/corrosion metal loss. The local wall thinning areas were located at three different areas, called extrados, crown and intrados. The elbow specimens were subjected to cyclic in-plane bending under displacement control with or without 3MPa inner pressure. The effects of eroded conditions, such as eroded ratio, eroded angle and position, on the low cycle fatigue behavior and fatigue life were discussed. Three-dimensional elasto-plastic analyses were also carried out using the finite element method. Prediction result for the location of crack initiation and the crack growth direction were discussed.
2009-07-24