Preliminary Research On The Response Of Thin Aluminum Plate Subjected To Laser Irradiation And Tangential Gas Flow

In order to explore how the tangential gas flow impacts the laser irradiation effectson thin aluminum alloy plate, experiments and numerical simulations are performed inthis paper, to study the thermal-mechanical response of thin aluminum alloy plateirradiated by laser beam and subject to subsonic tangential gas flow.The temperature history, the central displacement, and the break time of the plateare measured in the experiments. With deep analysis of the experiment results, fourpoints could be made.(1) When the gas flow velocity keeps constant, the plate breaktime decreases approximate lineally when the laser intensity increases, so does the laserenergy incident on the plate till the break time.(2) When the spot size notably decreases,intenser laser beam must be applied to break the target, as the transverse heatconduction within the plate becomes more important.(3) The thickness of the platesignificantly affects the plate response. Though the incident energy per unit mass keepsalmost constant, the crack picture changes obviously when the plate thickness changesfrom1mm to1.5mm.(4) The composition of flow does not have obvious influence onthe irradiation effects.Numerical simulations are carried out to study the thermal-mechanical response ofthin plate, and the simulation results agree well with the experiment measurements.