組合せ荷重を受けるパイプの最終強度(その2) : 海底パイプラインの座屈伝播圧力の一解析法

概要

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When local buckles or dents occur in a submarine pipeline, these local damages may change into a longitudinal buckle and propagate along the pipeline by the action of external pressure alone. The lowest pressure required to maintain the propagating buckle is called "propagation pressure" and is a characteristic pressure of the pipe. In this paper a simple analytical method is proposed for evaluating the propagation pressure based on a rigid-linear strain hardening hinge model considering large deformation. For greater applicability, parametric analysis is made using the proposed method and an at-tempt is made to fit a single formula to them, the resulting formula is: [numerical formula] The maximum difference between this formula and the actual values from the above mentioned method is less than 0.5%. The proposed formula is checked with available published test data and other formulae. The following conclusions are obtained. 1) Relatively good agreement are found compared with the experimental data. 2) Considerable increasses may be expected of the propagation pressure for thick pipe by considering material strain hardening.
社団法人日本船舶海洋工学会の論文