船殻構造部材の応力拡大係数K値算式例
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Verification for the cargo tank of the liquefied gas carrier that it is of safe life, type B design which presupposes a limited fracture calls for analysis of fracture mechanism of the tank structure^<1)>. There is a move, as well, towards performing the similar analysis for ships other than the liquefied gas carrier to assure their structural safety^<2)>. When analyzing the fracture mechanism, in what manner to calculate the stress intensity factor K is one of important consideration. This problem has been explored by N0.3 Standardization Research Committee^<1)> and No. 169 Research Committee2) of the Shipbuilding Research Association of Japan, etc., but these researches contain not all members of hulls. The author carried out fatigue tests on some types of tank structural members, to obtain data on the initiation and propagation of fatigue cracks. Propagation of the fatigue crack can be defined by the Paris' law which employs K as parameter. Based on these data, as well as using the ordinary methods of K and stress concentration calculations by finite element method, etc., the author devised an approximation formula to obtain K for each of the following four types of tank structural members. 1) Crack at the bracket end jointed inT. L, or overlapped form to the longitudinal. 2) Crack at the end of stiffener reinforcing the bracket. 3) Crack at the end of web stiffener in corner R of girder joints. 4) Crack at the snipped end of the built up type of the girder.
- 社団法人日本船舶海洋工学会の論文
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