Thermal Stresses as a Laser Heating Damage Mechanism
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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The relative significance of thermal stresses as a laser heating damage mechanism is assessed by comparison with the damage mechanisms of melting and thermal degradation of structural strength properties. The limiting cases of one-dimensional axial and one-dimensional radial heat flux in a thin target plate whose plane is normal to the axis of a stationary, axially symmetric heat source, are investigated. A one-dimensional radial heat conduction numerical model of the linear thermoelastic stress field including the effects of melting and structural failure is developed. Residual tensile strength and damage size are presented as functions of the laser beam and target plate parameters.
- Lasers and Masers