Date of Award

1994

Document Type

Thesis

Degree Name

Master of Science in Applied Physics - (M.S.)

Department

Physics

First Advisor

Daniel Ely Murnick

Second Advisor

Philip R. Goode

Third Advisor

Yuan Li

Abstract

Localized laser heating is widely used in materials processing. In extending these techniques to materials with relatively low thermal conductivities and ductilities such as ceramics and glasses, existing methods must be modified to control the high thermal stresses which are associated with the localized heating of these materials. Thermal profiles must be designed to minimize damage to regions adjacent to the processed area. To achieve this with single beam sources the power and radius can be varied in time, or the beam can be moved across the surface in a programmed pattern to achieve the desired thermal profile.

In this work the thermoelastic effects associated with fixed and moving beam sources are examined in light of the application described above. Finite difference models of the temperature rise and resulting stresses and strains for the surface heating of a semi-infinite half-space are presented. These simulations are then compared to experimental results obtained with a CO, laser aimed with computer controlled optics.

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