船用钢板激光弯曲成形中板材几何效应数值模拟.pdfVIP

2003 年MSC.Software 中国用户论文集 船用钢板激光弯曲成形中板材几何效应的数值模拟 吕波 张立文 裴继斌 钟琦 王存山 张国梁 大连理工大学材料系 - 1 -1 2003 年MSC.Software 中国用户论文集 船用钢板激光弯曲成形中板材几何效应的数值模拟 Numerical Simulation of Geometrical Effects on Process of Laser Bending of Shipbuilding Sheet Metal 1 1 1 1 2 1 吕波 张立文 裴继斌 钟琦 王存山 张国梁 1.大连理工大学材料系 2.三束材料改性国家联合重点实验室 摘 要:使用有限元分析软件MSC.Marc 对船舶钢板的激光弯曲成形过程进行数值模拟， 建立了板材激光弯曲的三维弹塑性非线性有限元热力耦合数值模型，计算了船用钢板激光 弯曲成形过程的温度场和变形场。模拟结果与试验结果符合较好。在此基础上，对船舶钢 板的激光弯曲成形中板材的几何效应进行了数值模拟研究，得出在特定条件下各技术参数 与激光弯曲变形量之间的定量关系，为实际生产中制定和优化钢板激光弯曲成形的主要参 数提供理论依据。 关键词：船用钢板 激光弯曲成形 几何效应 数值模拟 非线性有限元 Abstract: Numerica l simu lation of laser bending of shipbuilding sheet meta l was carried out at the advantage of f inite e lement analytical software MSC.Marc and a 3-D elasto-plastic thermo-mechanica l finite element mode l was deve loped. The temperature field and the displacement f ield of laser-bending form ing of shipbuilding sheet metal were calculated using the model. The simu lation results were in good agreement with experimental results. After that, geometrica l effect of sheet was simu lated numerica lly and the definite relationship between displacement of plate and technical parameters on the certain conditions during the laser forming process was achieved. The obtained results could provide theoretic basis for engineering application of this technology in the future. Key word: Sh ipbuilding sheet meta l, Laser bending, Laser forming, Geometrical effect, Numerical simulation, Nonlinear FEM 1 引言 激光弯曲成形方法是一种新型金属板材柔性成形技术。这一成形方法将激光加工技术 应用到热应力成形技术中，以相干性好、方向性好、易于精确控制的高能激光束作为热源， 利用激光束快速扫描金属板材表面时形成的不均匀温度场所导致的热应力来实现板材的塑