激光冲击是一种以高功率脉冲激光辐照金属材料的新型表面改性处理技术.在水约束层和记号笔涂层作保护层的情况下,对铝、钛和不锈钢3种典型的金属结构材料进行激光冲击对比实验,获得强激光冲击作用下3种金属结构材料的损伤特性,并定量分析了激光冲击次数与金属材料表面凹坑深度的关系.结果表明:凹坑深度与冲击次数呈线性关系,且斜率与金属材料的屈服强度成反比.为探究激光冲击光斑形貌对金属材料损伤的影响,对比了方斑和圆斑的冲击情况.测试数据显示试件表面损伤形貌与光斑一致且圆斑造成的损伤更严重.
Laser shock is a new surface modification technology for metal material by irradiating them with high power pulsed laser.The laser shock contrast experiments are carried out on three typical metallic structural materials,aluminum,titanium and stainless steel with water bound layer and mark pen coating as protective layer.The damage characteristics of the three metallic structural materials are obtained under high laser shock,and the relationship between the number of laser shock and pit depth on the metal samples is analyzed quantitatively.Results show that the dent depth and impact times show a linear relationship,and the slope is inversely proportional to the yield strength of metal materials.To explore the effect of laser shock spot morphology on metallic material damage,the impact situation of square and circular spots are compared.Test data show that the surface damage morphology of the specimen is consistent with the spot,and damage caused by the circular spot is more serious.
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