The Effect of Temperature on the Stick-Slip Friction Behavior of Optical Glasses in Precision Glass Molding

Abstract:

Understanding the frictional behavior between glass and metals at elevated temperatures is necessary for accurate modeling and simulation of the precision glass molding (PGM) process, and can help in determining the required geometry of molds, inserts, and dies to produce various optical components. In this research, the frictional behavior of N-BK7, an oxide glass, at elevated temperatures in contact with plain steel has been studied. The results show two important phenomena related to temperature. First, the stick-slip phenomenon is more pronounced at higher temperatures close to the glass transition temperature. This is expected since relaxation and creep of glass occur by molecular diffusion, which becomes more rapid as temperature increases. Second, when the temperature is above the glass transition temperature and the glass begins to behave viscoelastically, the stick-slip friction behavior shows an exponential increase in friction force prior to the onset of sliding that is characterized by a jump in the position data on the order of several micrometers, and is consistent with the response of a viscoelastic material to applied load.

• Periodical: Applied Mechanics and Materials (Volume 307)
• Pages: 381-386
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.307.381
• Online since: February 2013
• Authors: Peiman Mosaddegh, John Ziegert
• Keywords: Dry Friction, Precision Glass Molding, Stick-Slip, Viscoelasticity

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