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RESEARCH PAPERS: Heat Transfer in Manufacturing

Measurement of the Transient Glass Surface Deformation During Laser Heating

[+] Author and Article Information
T.-R. Shiu, C. P. Grigoropoulos, R. Greif

Department of Mechanical Engineering, University of California, Berkeley, CA 94720-1740

J. Heat Transfer 121(4), 1042-1048 (Nov 01, 1999) (7 pages) doi:10.1115/1.2826054 History: Received June 09, 1998; Revised January 22, 1999; Online December 05, 2007

Abstract

The distinct transient geometry and material response of a deforming glass surface during CO2 laser heating are related to the temperature history and the thermal regimes resulting from different energy deposition and heating rates. The transient deformation is measured using a probing system based on the photo thermal deflection technique. The variation with temperature of the optical constants yields a variable reflection signal which ultimately decreases, corresponding to a permanent volume expansion. The transient deflection signal associated with the variable deformation results from the distinct physical mechanisms in three thermal regimes, i.e., the elastic behavior, the glass transition, and the viscous flow regimes.

Copyright © 1999 by The American Society of Mechanical Engineers
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