毫秒激光辐照含杂质熔石英的热应力研究

Study on Thermal Stress of Fused Quartz with Impurities Irradiated by Millisecond Laser

为了研究毫秒脉冲激光辐照含缺陷熔石英的热应力特性,本文基于热传导理论和弹塑性力学理论,利用有限元分析软件对毫秒脉冲激光辐照含缺陷熔石英的过程进行了数值分析,得到了熔石英的温度及应力变化规律。结果表明:通过数值计算,发现含有杂质的熔石英材料和不含有杂质的熔石英材料进行对比,含有杂质的熔石英材料温升笔画和应力变化更明显。当毫秒激光正好落在杂质中心位置,此时熔石英材料产生的温升最大,在杂质中心更容易产生热膨胀。

In order to study the thermal stresscharacteristics of defective fused silica irradiated by millisecond pulsedlaser, based on the theory of heat conduction and elastic-plastic mechanics,the finite element analysis software wasused to numerically analyze the process of irradiated defective fusedsilica by millisecond pulsed laser. Thevariation of temperature and stress of fused quartz was obtained. The resultsshow that: through numerical calculation, it is found that the temperature risestroke and stress change of the fused silica material containing impurities aremore obvious when comparing the fused silicamaterial with impurities and the fused silica material without impurities. Whenthe millisecond laser falls on the center of the impurity position, thetemperature rise generated by the fused silica material is the largest, andthermal expansion is more likely to occur at the impurity center.