激光功率密度对板料激光冲击成形性能的影响

Effect of laser power density on laser shock formability of sheet metal

为了研究激光功率密度对铝合金板激光冲击成形性能的影响,采用数值仿真的方法,选用不同激光功率密度对铝合金板进行激光冲击成形数值模拟,获得不同激光功率密度与冲击次数下的板料成形极限,并对不同激光功率密度冲击下板料的成形深度、厚度及应力分布进行了分析。结果表明,板料在中心处容易发生破裂;板料的成形极限与激光功率密度大小成反比,而与激光冲击次数成正比;通过合理选择激光功率密度和冲击次数可提高铝合金板的成形性能。

In order to study the effect of laser power density on laser shock formability of aluminum alloy sheet, the forming limit, depth, thickness and stress distribution of the sheet were simulated under different laser power density and different number of laser shock. The results show that fracture is prone to happen in the centre of sheet and the forming limit is inversely proportional to the laser power density, but directly proportional to the number of laser shock. The formability of aluminum alloy sheet can be optimized through proper choice of laser energy and the number of laser shock.