任意形状内部き裂の欠陥面積の非破壊検査による簡便計測手法(<小特集>X線材料強度小特集)

概要

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Fracture toughness tests of specimens with arbitrary-shaped cracks were carried out. The K_e-estimation based on the published standard cord for assessing defects was significantly conservative. The one based on the proposed method for assessing defects, where the reduced circular crack with an area equivalent to an arbitrary-shaped crack was introduced, was reasonable and in good agreement with the K_<IC>-value. Ultrasonic tests of specimens with arbitrary-shaped embedded cracks were carried out. The estimating equation of the defect radius r_<ei> was given as 2r_<ei>=Wx10^<(V-β'Iα')> where W is the path length, V the relative peak echo hight, β' and α' constants. The defect radius evaluated by using the estimating equation was coincident with the equivalent radius of reduced circular crack in the scatter range of ±50%.
社団法人日本材料学会の論文
1987-08-15