透明光学材料中缺陷吸收激光能量引起的热应力与断裂

 利用热弹性理论分析了在光学材料中由于缺陷吸收激光能量引起的温度和热应力分布,并且针对一个简单的裂纹模型分析了热应力产生的应力强度因子,并且给出了一些主要参数对于应力强度因子的影响的规律。

Thermal stress and fracture in transparent optical materials due to laser energy-absorption by a defect

This paper presents the distributions of temperature and thermal stress in the transparent optical materials, resulting from the laser energy-absorption of a defect. When the defect is point like, the maximum value of normal stress in y direction locates on the boundary. With the increase of x , the stress decreases obviously. But when there exists a line flow, the normal stress in y direction is minimum at the boundary and is singular at the two ends of the linear flaw. Based on a simple crack model, the relative stress intensity factor (SIF) and effects of various parameters on SIF were analyzed. The results show that, in the case of point like defect, SIF increases monotonously with the enlargement of the ratio between the crack length and the distance from the defect to the boundary line. However, the effect of the ratio on SIF is more complex, when the flaw is linear. The method adopted in this paper can be expanded to analyze planar flaw or the parallel multi flaws. .