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通过对涂层进行单脉冲激光加载时产生的冲击应力与温度场的理论分析,提出以二分法迅速逼近涂层失效的激光功率密度范围,单脉冲激光离散划痕路径的优化方法。对激光能量的稳定性进行标定,并得出电压与激光实际加载能量的拟合关系式;采用二分法逼近激光功率密度范围并通过功率计在线检测确定涂层的失效阈值,对相关实验结果进行拟合处理,获得实际失效功率密度范围为0.328~0.391 GW/cm2,实际失效阈值分别为0.359 GW/cm2,0.348 GW/cm2,0.381 GW/cm2。经分析比较相关实验数据,验证了该方法的可行性和可靠性。
Based on the theoretical analysis of the impact stress and temperature field produced by single-pulse laser loading, the dichotomy method is proposed to quickly approach the laser power density range of coating failure and the optimization method of single-pulse laser scratch path. The calibration of the laser energy stability and the fitting relationship between the voltage and the actual laser loading energy were obtained. The dichotomy was used to approach the laser power density range, and the failure threshold of the coating was determined by on-line power meter. The related experimental results The actual failure power density ranged from 0.328 to 0.391 GW / cm2, and the actual failure thresholds were 0.359 GW / cm2, 0.348 GW / cm2 and 0.381 GW / cm2, respectively. By analyzing and comparing the relevant experimental data, the feasibility and reliability of the method are verified.