摘要
本文对金属薄板的激光弯曲成形进行了试验研究和数值模拟。试验采用2KW YAG激光器扫描纯铝薄板,完全在热应力作用下使金属板料发生弯曲。在不同激光功率、线能量和面能量条件下进行了激光弯曲成形试验,并建立了激光弯曲成形温度场的数学模型,对金属板料的三维瞬态温度场进行了模拟计算,在此基础上分析了变形温度和应变速度对板料屈服强度的影响及其相互之间的耦合关系,揭示了能量因素对材料温度特性、力学特性及弯曲角的影响特点。
Computer simulation and experimental investigation of the sheet metal bending by the laser beam scanning are presented in this paper. The 200 × 100 × 2mm3 pure aluminum plates were scanned by a YAG laser with a maximum output power of 2KW and distorted by the laser - induced thermal stress. The sheet metal bending had been performed for vary and constant laser power, line energy and area energy. For the analyses, the finite element numerical simulation was used for calculating 3-D transient temperature field of sheet metal. Based on the experimental results and numerical analysis, the influence of deformation temperature and strain rate on the flow stress, and the coupled relationship between them were investigated. The paper also describes the effects of energy on mechanical properties and thermal properties and bending angle.
出处
《应用激光》
CSCD
北大核心
2002年第2期156-159,240,共5页
Applied Laser
关键词
激光成形
热应力
能量因素
数值模拟
温度场
laser forming, thermal stress, energy factor, numerical simulation
