Study on Brittle Crack Arrester : Considerations on the Arrest of a Very Long Crack

概要

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In the previous reports, a simple fracture mechanics concept has been successfully applied to the analysis on the experimental results of several kinds of brittle crack arrester using medium size specimens (500 mm wide). The length of arrested crack considered was limited within about 300mm. This report discusses about the propagation-arrest of a very long crack together with the effects of specimen geometry and loading condition to be accounted for in the brittle crack propagation-arrest test. The experimental results obtained from very wide specimens (1,000 to 2,400 mm wide) showed that a simple extrapolation of the concept which was valid for shorter crack could not be applied to the arrest of a very long crack. As a practical solution to this problem, a consideration on the saturating characteristics of nominal K value of a propagating long crack has been made using a new concept of " effective K value", and some design aspects of brittle crack arresters are discussed on the basis of this consideration.
社団法人日本船舶海洋工学会の論文