Dynamic Thermoelastic Behavior in Sheet Glass Generated by Pulsed Laser Irradiation Using a One-Dimensional Model
Akira Chiba, Hirofumi Hidai, Souta Matsusaka,
and Noboru Morita
*Department of Mechanical Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
The dynamic thermoelastic behavior of a sheet glass subjected to single-pulse laser irradiation is clarified using a one-dimensional model. From the equation of motion for this system, a thermoelastic equation was derived and applied in the analysis. For a 0.1-µs pulse duration, the displacement and thermal stress caused by the thermal expansion within the slab show oscillatory wave characteristics. When thermal stress waves are reflected at the free ends of the sheet glass, the polarity of the stress changes. Alternating stress waves of approximately 0.5-MHz frequency appear in the slab. With cracks propagating in the glass as a result of stress, high-cycle fatigue is possible. We confirm that the dynamic behavior generated by single-pulsed laser irradiation features wavelike properties.
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