Abstract
Crack arrester is employed for preventing brittle cracks from causing catastrophic failure of large steel structures. In large container ships, so called “structural crack arrest design” utilizing welded joint has been recently used to improve brittle crack arrestability of the structures. Although such design is already applied to commercial ships, the mechanism of crack arrest in such design has not been clear because crack behavior in the joint is 3D and hard to measure by conventional methods. Therefore, in order to clarify crack arrest mechanism in structural crack arrest design, 3D rapid crack propagation and arrest behavior was observed in T-joint-like structures made of transparent elastic material by using high speed camera. The observation showed that the crack front shape was significantly important to consider crack arrest mechanism because the semi-elliptical-like crack front shape in flange plates caused reduction of SIF and crack arrest.
Published Version
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