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Precision Machining of Hard and Brittle Materials: “Ductile Regime” or “Brittle Regime”?

Reporter: Prof. Bi Zhang, University of Connecticut,

Time: 10:00-11:00

Place: Room 410, Old Hydraulic Building


Abstract:

Hard and brittle materials, such as ceramics and silicon wafers, are difficult to machine materials because of their hard and brittle nature. This presentation focuses on precision machining of hard and brittle materials, and discusses machining mechanisms in terms of “ductile-regime” or “brittle-regime” from the view-point of mechanics and materials. The presentation also introduces recent research outcomes on machining mechanisms of hard and brittle materials from other research groups. The presentation raises the following questions:

1. Is material pile-up in a precision machining process an indication of plastic/ductile deformation?

2. What roles do strain and strain rate play in precision machining of hard and brittle materials?



Brief Introduction:

Dr. Bi Zhang is professor in the “Thousand Talents Program” at Dalian University of Technology (DLUT) in China. He is a tenured professor of the University of Connecticut (UConn) in the US. He served as the Director of the Precision Machine Tool Center during 1993-1998, and the Program Director for Management & Engineering for Manufacturing of UConn during 2011-2013. His research has been focused on precision manufacturing systems and processes, with an emphasis on precision machining of hard and brittle materials. Since 2010, he has been involved in additive manufacturing research of metallic parts, leading an effort in the novel area of additive/subtractive hybrid manufacturing. He published over 100 journal papers to disseminate his research outcomes. He is a fellow of the CIRP (The International Academy for Production Engineering), and a fellow of the ASME (The American Society of Mechanical Engineers).