Study of thermal stress behavior of sheet glass during laser irradiation using one-dimensional elastic wave model

Abstract

The thermoelastic behavior of sheet glass during laser irradiation was clarified using a one-dimensional model. A thermoelastic equation based on an equation of motion with the damping force proportional to the deformation velocity was applied. The thermal and thermoelastic equations were numerically solved by the finite difference method based on an implicit method for the time evolution. A proportional damping coefficient (PDC) was adopted for the calculation. In the case of a stationary heat source, compressive stress on the heated region changed into tensile stress 0.1 s after the end of heating. In the case of a moving heat source, the highest tensile stress was induced when the PDC was less than 0.1. An optimal combination of velocity and the PDC that induced the maximum tensile stress was obtained.