1027 ウォータージェットピーニング(WJP)の開発と性能予測 : (3)気泡崩壊エネルギー解析(OS10-7 供用エネルギー機器の経年変化と健全性評価-ピーニング-)

概要

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We developed a numerical method for predicting a distribution of compressive residual stress on a material surface after water jet peeing (WJP). WJP applies the bubble collapse energy of cavitating jet to the change of residual stress from tensile to compressive for preventing the occurrence of stress corrosion cracking. We estimated the impulsive bubble pressure that varied in microseconds by using a numerical simulation with 'bubble flow model'. The bubble collapse energy was evaluated by the cavitation intensity calculated from the bubble pressure. The cavitation intensity was predicted when the cavitating jet was impinged slantingly on cylinders, and was compared with the measured compressive residual stress after WJP. The distribution of the cavitation intensity corresponded qualitatively to that of the compressive residual stress on the cylinder surface.
一般社団法人日本機械学会の論文
2010-10-09