基于 L-S 广义热弹性理论 YSZ 在超短脉冲下的热力响应

Based on the L-S generalized thermoelastic theory and in view of the specific heat capacity change of material with temperature, the control equations for the thermoelastic coupling system with internal heating source were established. The thermomechanical responses of yttrium tetragonal zirconia (YSZ) under the action of ultrashort pulse laser were studied by means of the finite element method. The effects of the specific heat capacity change with temperature, and the pulse width of the laser on the thermomechanical responses and the mechanical wave reflections in material were obtained. The results show that, under repeated pulse laser actions, the stress and displacement of the material will undergo fluctuations, and the mechanical response will be more sensitive to heating than the thermal response. The specific heat capacity change with temperature will result in the decrease of the thermal response. The study provides an important guidance for improving the ultrashort pulse laser machining quality.