关键词: 夹芯结构, 热冲击, 温度场, 热变形

Abstract:

In this paper,a finite element model is established to describe the intense laser-irradiated sandwich structure with aluminum honeycomb cores,and its temperature field and mechanical properties are analyzed by means of the sequential thermal-mechanical coupling. Moreover,the influence of the thickness,thermal conductivity and specific heat capacity of the heat shield on the temperature rise of the sandwich structure is investigated under
the condition of a certain laser power. The thermal deformation of the sandwich structure with heat shield and the equivalent stresses of the top face sheet and the honeycomb core are also discussed. The results indicate that the thermal conductivity of the heat shield has the greatest effect on the temperature field of the sandwich structure,while the specific heat capacity of heat shield within a certain range has a less effect,that,after the irradiation,the equivalent stresses of the top face sheet and the honeycomb core in the center of laser spot slightly exceed the corresponding yield strength and then slowly decrease,and that the thermal deformation of the sandwich structure mainly occurs in the center of the laser spot. Finally,the temperature rises as well as the thermal deformations of the sandwich structure with and without heat shield are compared,thus finding that the heat shield relieves and inhibits the temperature rise and the deformation.

Key words: sandwich structure, thermal impact, temperature field, thermal deformation