A Fundamental Study on Cavitation Erosion Using a Magnesium Oxide Single Crystal

利用氧化镁单晶进行空蚀的基础研究

• 批准号: 08650193
• 负责人: HATTORI Shuji
• 金额: $ 1.6万
• 依托单位: Fukui University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650193/
• 关键词: Cavitation; Cavitation Erosion; Magnesium Oxide Single Crystal; Metal; Bubble Collapse Pressure; Stress Distribution; Plastic Deformation; Dislocation; 応用分布

Cavitaion erosion is a phenomenon of progressive mass loss of original material from a solid surface due to continued exposure to cavitation, but it remains unclear how the pressure act on the surface. In this study, the pressure distribution was analyzed by using a magnesium oxide single crystal (100) surface exposed to cavitation. The size of the plastically deformed region and the distances of dislocation-etch-pits were measured. The results shows that the pressure acts normal to the surface, but not parallel, thus no shear stress acts on the surface for cavitation erosion. The maximum pressure ranges from 500MPa to 1000MPa. The high pressure region is very large, but the affected region is very large. The pressure distribution was confirmed to be reasonable by comparing it with pits observed on some metals with different yield strength. Moreover, when a material is exposed to cavitation for a long time, the surface is eroded like a sponge. Magnesium oxide single crystal polished with four grades of emery paper were exposed to cavitation. It is concluded that the growth of spongelike eroded surface is responsible for the dense dislocation rows initiated at the dents of uneven surface.

空蚀是由于持续暴露于空蚀而导致原始材料从固体表面逐渐质量损失的现象，但目前尚不清楚压力如何作用于表面。在这项研究中，压力分布进行了分析，通过使用氧化镁单晶（100）表面暴露于空化。测量了塑性变形区的尺寸和位错蚀坑的距离。结果表明，压力垂直于空蚀表面，而不是平行于空蚀表面，因此空蚀表面上不存在切应力。最大压力范围从500 MPa到1000 MPa。高压区很大，但影响区也很大。通过与不同屈服强度的金属上观察到的凹坑进行比较，证实了压力分布是合理的。此外，当材料长时间暴露于空化时，表面会像海绵一样被侵蚀。用四种不同等级的砂纸抛光氧化镁单晶，对其进行空蚀试验。结果表明，海绵状腐蚀表面的生长是导致不平整表面凹坑处产生密集位错列的原因。

项目成果

Shuji HATTORI,Toshiharu SUZUKI,Tsunenori OKADA: "Pressure Distribution on Material Surface Due to Cavitation Bubble Collapses" Proceedings of 8th Symposium on Cavitation. 35-38 (1997)

Shuji HATTORI、Toshiharu SUZUKI、Tsunenori OKADA：“由于空化气泡破裂导致材料表面的压力分布”第八届空化研讨会论文集。

森啓之・柴田勝博・服部修次・岡田敬庸: "キャビデーション気泡崩壊圧の伝ぱ挙動と壊食量(三層型制振材料を用いた結果)" 日本機械学会論文集. 62・600. 1820-1826 (1996)

Hiroyuki Mori、Katsuhiro Shibata、Shuji Hattori、Takayuki Okada：“空化气泡破裂压力和侵蚀量的传播行为（使用三层阻尼材料的结果）”日本机械工程师学会会刊 62, 600。1820 年 -1826 年。 (1996)

Hiroyuki MORI,Katsuhio SHIBATA,Shuji HATTORI,Tsunenori OKADA: "Cavitation Erosion Based on The Propagation of Stress Waves (Result of 3-Layr Damping Materials)" Trans, JSME. 62-600. 1820-1826 (1996)

Hiroyuki MORI、Katsuhio SHIBATA、Shuji HATTORI、Tsunenori OKADA：“基于应力波传播的空化侵蚀（三层阻尼材料的结果）”Trans，JSME。

F.G.Filali, J.M.Michel, J.P.Franc, S.Hattori: "Etalonnage enforcedu cavermod,moyen d'essai d'erosion decavitation" La Houille Blanchen. 6. 40-46 (1997)

F.G.Filali、J.M.Michel、J.P.Franc、S.Hattori：“Etalonnage enforcedu cavermod，moyen dessai derosion decavitation” La Houille Blanchen。

F.G.Filali., J.M.Michel., J.P.Franc., S.Hattori: "Etalonnage en force du Cavermod, moyen d'essai d'eosion de cavitation" La Houille Blenchen. 6. 40-46 (1997)

F.G.Filali.、J.M.Michel.、J.P.Franc.、S.Hattori：“Etalonnage enforce du Cavermod，moyen dessai deosion de cavitation”La Houille Blenchen。