固/液金属界面のキャビテーション損傷に及ぼす疲労強度劣化(オーガナイズドセッション,材料強度と構造設計)

概要

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High power spallation targets for neutron sources are being developed in the world. Mercury target will be installed at the material and life facility in J-PARC, which will promote innovative science. The moment the proton beams bombard the target, pressure waves will be generated in mercury by thermally shocked heat deposition. Cavitation will induced through the pressure wave propagation in the mercury and eroded the vessel inner surface contacting with the mercury. The eroded vessel wall is damaged by cyclic fatigue because pulsed proton beams strike the target repeatedly. It is, therefore, important to investigate the fatigue strength of the eroded vessel wall. Actually, the erosion and fatigue damages will be imposed on the vessel wall at the same time. In order to precisely investigate the effects of damages, at the first, the pitting damage by erosion was evaluated against the magnitude of pressure pulse and the number of pulses, and then the fatigue test was carried out using the specimen with a certain pitting damage.
社団法人日本機械学会の論文
2004-09-23