1020 有限要素解析による減肉配管の曲げ座屈荷重評価(OS10-5 供用エネルギー機器の経年変化と健全性評価-配管・エルボー強度-)

概要

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Effect of wall-thinning area dimensions on the flexural buckling load was addressed through the finite element linear buckling analysis. The width and length of rectangular wall-thinning were systematically changed, and the variation of elastic flexural buckling load was calculated. From the simulation result, the flexural buckling load considerably decreased when the wall-thinning area exceeded the value of mean radius in length and 180 deg in width. Further investigation using the nonlinear finite element analysis, which considered the internal pressure with the material nonlinearity and geometrical nonlinearity, showed that the internal pressure made the plastic collapse load decrease. Moreover, we found that the limit load was valid even in case that the plastic flexural buckling, that is, the local buckling occurred for wider wall-thinning.
2010-10-09