Temperature field and thermal deformation of sandwich panels with closed-cell
aluminum alloy foam core and heat-protective layer, which are subjected to
Gaussian laser beam intensively irradiating, are investigated numerically. In
transient heat analysis models, the influence of thermal conductivity,
specific heat, and thickness of heat-protective layer on the temperature rise
of the sandwich panels is calculated. In stress analysis models, a sequence
coupled numerical method is utilized to simulate the thermal stress and
deformation of sandwich panels induced by thermal expansion. Simulation
results indicate that the temperature at center of sandwich panel increases
firstly and then drops gradually with the increase of thermal conductivity of
heat-protective layer after laser irradiation, and the critical thermal
conductivity is obtained, while it decreases with the increase of specific
heat and thickness of heat-protective layer. The thermal stress verifies the
?Cyclo-hoop effect?, i. e. radial stress is compression stress in ?hot zone?
and tension stress in ?cold zone?. The max thermal deformation of sandwich
panels slightly increases with the increase of thickness of heat-protective
layer for given specific heat and thermal conductivity.
Study of thermal stress behavior of sheet glass during laser irradiation using one-dimensional elastic wave model
