クラックアレスターに関する基礎的研究 (第6報)

スチフナ型アレスタの有効性について

抄録

In the previous reports, the authors applied fracture mechanics approach to the problem of brittle crack propagation-arrest and of the quantitative evaluation of effectiveness of several types of crack arrester model.
This report contains the experimental and theoretical considerations on the “stiffener-plate type arresters”, in which crack arresting is effected by arresting force of the stiffener to restrain the open-up displacement propagating crack. Analysis of the effectiveness of the stiffener-type crack arresters is made on the basis of fracture mechanics concept. Results of large-sized brittle crack propagation test using the double tension specimens with several kinds of stiffener-type arrester are described as well as the comparison with calculated results.
The stiffener-plate type crack arresters are considered to be of much practical importance because their configurations are similar to the stiffening members often used in many welded steel structures such as ships, etc., But the method of quantitative estimation for the effectiveness of such crack arresters has not yet been available. Thus the authors carried out experiments and some approximate calculations to clarify the fundamental and practical aspects of the Stiffener plate-type crack arresters.