材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
隣接内部き裂の欠陥評価法に関する検討
武藤 睦治坂本 勲井上 昌弘岩本 利一
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1986 年 35 巻 393 号 p. 654-658

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Fracture toughness tests were performed on the specimens with neighbouring embedded cracks produced by using the diffusion welding method in order to investigate the method of assessment for neighbouring embedded defects.
It was found that for s/re2>0.7 (where s/re2 is the ratio of the spacing of adjacent cracks and the radius of a reduced circular crack with an area equivalent to that of a larger crack), the K-value can be estimated by supposing isolated cracks, and for s/re2≤0.7, it can be estimated by using a reduced circular crack with an area equivalent to an added area of adjacent cracks. The proposed method of combining two adjacent cracks does not contradict with the one proposed in the previous paper, in which an embedded crack near surface is substituted with a surface crack.

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