Development of the control technique of ultrahigh pressure generated by an underwater discharge and their applications for cutting and plastic working

2014 Fiscal Year Final Research Report

• Project/Area Number: 25871248
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Production engineering/Processing studies; Composite materials/Surface and interface engineering
• Research Institution: Kumamoto Industrial Research Institute
• Principal Investigator: HAMASHIMA Hideki 熊本県産業技術センター(ものづくり室、材料・地域資源室、食品加工室), その他部局等, 研究員 (30398242)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 塑性加工 / 衝撃加工 / 衝撃波 / 高速度撮影 / 超高圧力 / 水撃 / 水中放電

Outline of Final Research Achievements

In order to establish the control technique of ultrahigh pressure generated by an underwater discharge, the experimental device used for optical observation was developed. Using this device, the electrode shape was optimized. And it succeeded in the observation of bubble pulse, bubble pulsation and water hammer generated by an underwater discharge. As a result, a steady ultrahigh pressure generated by an underwater discharge became available. The validity of the numerical simulation was evaluated compared with the experiment. It became possible to control the ultrahigh pressure of the water hammer etc. by using the numerical simulation. The prototype to develop cutting and the plastic working method using an underwater discharge was produced. It was demonstrated to be able to use an underwater discharge for the plastic working of thin metal sheet with this device.

Free Research Field

衝撃工学