4021 火力プラント構造機器における限界き裂寸法の評価 : その1 破壊基準と破壊荷重の検討(S25-5 寿命評価,S25 材料・構造の非弾性挙動・高温強度・損傷評価)

抄録

To achieve rational maintenance for fossil power plants, prediction of remaining life for structure components is quite important. Precise evaluation of critical flaw sizes, which provides failure criteria of the components with postulated crack-like-flaws under a specific operating condition, is one of the key issues. In this paper, fracture criteria of a structure material with a wide range of temperature including transition temperature range were examined. Based on the fracture test results, it is ascertained that fracture load can be well predicted by R6 procedure for assumed temperature range of interest.