OS1431 ウォータージェットピーニング(WJP)の開発(3) : WJPの流れ挙動評価(エネルギー機器の経年劣化に関する健全性評価,オーガナイズドセッション)

概要

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We developed a new method for predicting a range of compressive residual stress on the material surface after water jet peeing (WJP). Cavitating jet is impinged on the material surface in WJP. The bubble collapse impact causes the plastic deformation of the material surface, and changes the residual stress from tensile to compressive. The compressive residual stress prevents the occurrence of the stress corrosion cracking. We numerically simulated impulsive bubble pressure that varied in microseconds in the cavitating jet with `bubble flow model'. The bubble collapse impact was evaluated by the cavitation intensity calculated from the bubble pressure. The cavitation intensity was compared with the measured compressive residual stress after WJP. The range of the cavitation intensity corresponded to that of the compressive residual stress with the prediction error of plus or minus 15 percent in four different conditions of the jet velocity and the distance between the jet nozzle and the material surface.
一般社団法人日本機械学会の論文
2009-07-24