脉冲激光冲击LD31薄板变形的实验和数值模拟

激光冲击板料变形是利用高能脉冲激光和材料相互作用诱导的高幅冲击波的力效应使板料产生塑性变形的新技术 ,本文利用Nd :Glass脉冲激光对厚度为 0 .8mm的LD31薄板进行激光冲击变形实验。所用激光参数为 :脉冲能量 15～ 30J,脉冲宽度 2 5ns ,光斑直径Φ8mm。利用ABAQUS软件对激光冲击下板料的变形过程进行了数值模拟 ,建立了激光冲击波加载的数学模型 ,探索激光冲击的主要参数和板料变形之间的相互关系 ,为激光冲击变形工艺参数的优化、板料变形的理论分析 ,实现大面积金属板料的柔性激光冲压成形提供依据。

Experiments and FEM analysis of LD31 sheet deforming by pulsed laser shocking

The sheet metal deforming induced by laser shock peening is a new technique realized by laser induced shock wave on the surface of sheet metal. Since the laser pulse involves the application of high power in short time intervals, the process is adaptable to high speed manufacturing. In this paper, the deforming experiments of LD31 aluminum alloy was carried out under one laser shocking. The used laser was a high-power, Q-Switched, pulsed neodymium-glass laser, producing a pulse of 25 nanoseconds long and 1.064μm wavelength, with an energy per pulse of 15 to 30 joules. On the basis of mathematical modeling of laser shock waves loading was established, numerical simulation of sheet metal deforming process was done with the ABAQUS software. Some influenced factors to the results of deforming contour and magnitude were discussed. By the means of FEM technique, the laser process parameters can be optimized and the deformation contour of laser shock forming of sheet metal be predicted. This is significant to control the deforming process and program the controlling software.