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为了研究阻尼橡胶材料与纳秒激光的相互作用,通过单脉冲激光进行刻蚀实验,观察了橡胶材料的损伤情况,分析了其损伤机理。结果表明,短脉冲激光能量作用于阻尼橡胶材料表面时,由于橡胶材料的热传导系数较低,激光能量所产生的热量将极大地集中在光斑区域内。在高温条件下,橡胶材料发生热裂解、老化等现象,所形成的孔洞内呈现出明显的蜂窝状的热烧蚀状态。随着单脉冲能量的增加,孔的深度和直径增大,且孔内的烧蚀状态更加明显。通过测量烧蚀直径和深度,计算了阻尼橡胶材料在13ns激光单脉冲作用下的损伤阈值。利用有限元方法模拟了阻尼橡胶材料的单脉冲损伤过程,利用模拟结果再次计算了材料的单脉冲损伤阈值,与实验结果吻合较好。
In order to study the interaction between the damping rubber material and the nanosecond laser, the damage of the rubber material was observed by single pulse laser etching, and the damage mechanism was analyzed. The results show that when short pulse laser energy acts on the surface of damping rubber material, the heat generated by laser energy will be greatly concentrated in the spot area due to the low thermal conductivity of the rubber material. Under high temperature conditions, the rubber material pyrolysis, aging and other phenomena, the formation of the hole showed a clear honeycomb-like thermal ablation. With the increase of single pulse energy, the depth and diameter of the hole increase, and the state of ablation in the hole becomes more obvious. By measuring the diameter and depth of ablation, the damage threshold of damping rubber material under 13ns laser single pulse was calculated. The single-pulse damage process of damping rubber was simulated by finite element method. The single-pulse damage threshold of the material was calculated again by the simulation results, which is in good agreement with the experimental results.