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建立了强激光辐照下铝蜂窝夹芯结构的有限元模型,运用热/力序贯耦合方法对其温度场和力学行为进行了分析;研究了在激光功率一定的情况下,防热层的厚度、导热系数和比热容对夹芯结构温升的影响;分析了具有防热层夹芯结构的热变形及上面板和芯层的等效应力的变化规律.结果表明:防热层的导热系数对夹芯结构的温度场影响最大;在一定范围内,防热层的比热容对夹芯结构的温度场影响较小;经激光辐照后,夹芯结构上面板和芯层光斑中心处的等效应力略超相应的屈服强度,随后缓慢下降;夹芯结构的热变形主要发生在光斑中心处.最后将有无防热层的夹芯结构的温升和变形进行了比较,发现防热层对夹芯结构的温升和变形具有缓解和抑制作用.
The finite element model of the aluminum honeycomb sandwich structure under strong laser irradiation was established. The temperature field and mechanical behavior of the aluminum honeycomb sandwich structure were analyzed by using the method of thermal / sequential stress coupling. In the case of certain laser power, Thickness, thermal conductivity and specific heat capacity on the temperature rise of the sandwich structure were analyzed. The thermal deformation of the sandwich structure with the thermal insulation layer and the variation of the equivalent stress of the upper panel and the core were analyzed.The results showed that the thermal conductivity The temperature field of the sandwich structure has the greatest influence on the temperature field of the sandwich structure; within a certain range, the specific heat capacity of the thermal protection layer has little effect on the temperature field of the sandwich structure; after laser irradiation, The effective stress slightly exceeds the corresponding yield strength, and then slowly decreases; the thermal deformation of the sandwich structure mainly occurs at the center of the spot. Finally, the temperature rise and deformation of the sandwich structure with and without the heat protection layer are compared, The sandwich structure of the temperature rise and deformation with ease and inhibitory effect.