B-44 減肉配管 4 点曲げ試験での内外面ひずみに関する考察

概要

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Carbon steel is used extensively in piping systems of power generating plants. When high temperature and high pressure water and steam flow at high speed through these pipes, erosion/corrosion could occur and cause wall thinning. Evaluation of structural strength under sever earthquakes is one of the important issues for maintaining the integrity of piping systems. In order to clarify the failure mode and the limit load, cyclic bending test and analytical simulation had been performed on a straigth pipe of carbon steel with local thinning. From the experimental results, the failure mode was found to be low cycle fatigue enhanced by mechanical ratchet. In this study, elasto-plastic FEM analysis for locally thinned wall pipe was performed to clarify the effect of internal pressure. The strain at the thinned wall part was examined in several condition of internal pressure.
社団法人日本機械学会の論文
2000-03-29