Speaker: Yiğit Karpat

Title:  Model based investigation of cutting tool-workpiece interactions during machining of CFRPs

Date/Time: 23 December 2020/ 13:30 - 14:30

Zoom: Meeting ID:  -

Passcode: Registration is required

Abstract:Dry drilling of thick carbon fiber reinforced polymer (CFRP) laminates requires careful selection of process parameters in order to obtain acceptable borehole surface quality. Complex contact conditions between the drill margin and the borehole surface determine the integrity of the borehole surface depending on the process parameters and temperature-dependent viscoelastic material properties. Temperature rise during dry drilling reduces the elastic modulus of the CFRP and causes thermal expansion of the drill, resulting in considerable contact length at the drill margin and borehole surface interface. Manufacturers need a better understanding of the interaction among contact pressure, sliding velocity, temperature at the interface, and temperature-dependent material properties to develop predictive models for drilling CFRPs. In this talk, a hybrid model that combines a time-based analytical modeling of drilling process with a finite element-based modeling of temperature rise will be presented to examine this complex interaction.

Bio: Dr. Yigit Karpat is an Associate Professor in the Industrial Engineering Department of Bilkent University, with additional affiliations in the Mechanical Engineering Department and Bilkent-UNAM. He obtained his PhD in Industrial Engineering from Rutgers University in 2007. He holds a M.Sc from Middle East Technical University and B.Sc degree from Dokuz Eylül University, both in Mechanical Engineering. Since 2015, he has been involved with Micro System Design and Manufacturing Center of Bilkent University, where he leads the Precision Manufacturing Research Group. His research investigates multi-scale modeling of process-material interactions with a focus on difficult-to-cut materials.