数值模拟激光加载L_2铝板材高速成形瞬态响应  

Numerical Simulation of Transient Response Process of L_2 Aluminum Sheet by Laser Loading High-speed Forming

作　　者：姚红兵[1] 于文龙[1] 高原[1] 李亚茹[1] 孟春梅[1] 蒋光平[1] 张永康[2] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013 [2]东南大学机械工程学院,南京211189

出　　处：《光子学报》2014年第6期26-31,共6页Acta Photonica Sinica

基　　金：国家自然科学基金重点项目(No.50735001);国家自然科学基金(No.10804037);中国博士后科学基金特别资助项目(No.200902506);连云港市科技攻关计划(工业)项目(No.CG1315)资助

摘　　要：采用ABAQUS有限元仿真软件对激光加载L2铝板材高速成形进行数值模拟,研究了单脉冲激光冲击下成形的瞬态响应过程,获得了激光加载冲击成形过程中位移、速度、应变及应变率等特征量的变化特点.模拟表明,冲击后靶材中心区域发生明显塑性变形,变形截面呈锥形.高速成形过程中,金属板材首先发生振荡幅度非常大的快速弹性变形,其后进入减幅振荡直至静态,激光冲击成形时间在毫秒量级.板材不同节点的位移变化趋势相同,靠近中心区域位移大,边界区域位移小.成形中板材的中心区域速度最大达3 700m/s,变形过程前2μs内应变率急剧变化,最大达104~105 s-1量级.The high-speed forming process of L2 aluminum sheet by laser loading was numerically simulated with the finite element software ABAQUS. In the simulation, the transient response process of the forming by single laser loading was investigated, and the change rules of the characteristics, such as displacement, velocity, strain and strain rate, were discussed. The results indicated that an obvious plastic deformation occurred in the central part of the target after the laser loading, and the cross sections thereof were conical. During the process of high-speed forming, the metal sheet underwent a rapid elastic deformation with large oscillation amplitude, and then attenuated into a static state. In the laser forming, the deformation duration was usually at a level of a few microseconds. The displacements at the different nodes varied in a similar trend, among which those in the central region endured larger variations than those in the boundary region. The maximum speed in the central region of the aluminum sheet reach 3 700 m/s during the laser forming. The strain rate increased considerably in the period of 2 μs during the forming, whose maximum value is at a level of 104~10^5 s^-1.

关 键 词：激光技术 激光加载 高速成形 瞬态响应 特征量 数值模拟 

分 类 号：TN24[电子电信—物理电子学]