Abstract:

The thermal effect of metal spherical shell irradiated by invariable power density laser was calculated using finite element method, the variety rule for temperature rise and temperature difference of inwall and outerwall was analyzed, also the metals of copper and aluminum were taken for examples, the temperature variety and response time of the copper spherical shell irradiated by laser were compared with the aluminum spherical shell. The numerical calculation results indicate that, when the transitional process has finished, the temperature rising speed of inwall and outerwall is almost a constant, and the temperature difference of inwall and outerwall keeps invariably during laser irradiation. When the laser irradiation stops, the heat balance process between inwall and outerwall will be done within tens of milliseconds to one second for the copper spherical shell and aluminum spherical shell with thickness from 0.004m to 0.02m.

Key words: laser techniques, laser irradiation, metal spherical shell, temperature rise, temperature difference of inwall and outerwall