Elucidation of mechanical scribing mechanisms of glass sheet by ultrahigh speed photoelastic stress imaging technique, and development of dynamic scribing theory

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H03898
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Production engineering/Processing studies
• Research Institution: Chiba University
• Principal Investigator: Morita Noboru 千葉大学, 大学院工学研究院, 教授 (30239660)
• Co-Investigator(Kenkyū-buntansha): 比田井 洋史 千葉大学, 大学院工学研究院, 教授 (60313334) ; 松坂 壮太 千葉大学, 大学院工学研究院, 准教授 (30334171)
• Research Collaborator: CHIBA Akira 千葉大学, 大学院工学研究院, 研究員
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: ガラス / ホイール割断 / 高速偏光計測 / 位相差情報 / 内部応力場 / 割断面品質 / 走査型電子顕微鏡

Outline of Final Research Achievements

We investigated the relationship between internal stress fields, crack propagation behaviors and fracture surface qualities during wheel scribing of glass sheets. For this purpose, a wheel scriber that can operate in scanning electron microscope was developed. In addition, we tried to visualize the crack propagation behavior using a high-speed camera. These observation results showed that the fracture surface morphology depended on whether the penny cracks which appeared under the wheel were connected with each other. We also measured the phase difference distributions in glass sheets just after scribing using a high-speed polarization camera. As a result, it was found that the measured phase difference distribution included information about the crack propagation behavior, and this information could be used for the estimation of the fracture surface morphology. An in-process estimation method for the fracture surface morphology was therefore developed.

Free Research Field

生産工学・加工学