典型飞机构件焊接数值模拟系统研制

Numerical simulation system for typical aircraft components welding

针对典型飞机焊接构件,研制焊接热过程、应力应变以及变形的模拟系统.提出并利用面向网格划分的数据抽象造型方法,实现模拟过程的自动化.解决一般有限元软件模拟飞机构件焊接温度场和应力/应变场过程中操作繁琐的问题.系统采用面向对象方法设计.利用文中系统,用户只需输入构件模型几何参数,网格尺寸、热源参数、装夹位置和焊接顺序.这些参数经过系统核心类计算,生成温度和应力/应变模拟的自动化信息.自动化信息由系统转化为Marc的命令流文件,自动被导入到后台运行的Marc中计算,并对结果分析,实现对典型飞机构件焊接温度、应力/应变以及变形预测和分析.

A numerical simulation system of welding was developed for studying welding thermal process,welding stress/strain and welding deformations. A mesh-oriented data modeling method was applied to solve the problem which is too difficult to use normal FEM software to simulate welding thermal process,stress/strain and deformation of typical aircraft components. The simulation system was designed by using object-oriented method. Operating the system,a customer could simply input the geometry parameters,such as mesh size,welding thermal source parameters,fixing position and welding sequence,into the user interface. All the data input were changed into auto simulation information through the calculation of the system core class. After that,the auto simulation information was converted into Marc command stream which would be loaded by the wheeling Marc process on the background,and calculating the result data of welding thermal process,stress/strain and deformation can predict and analyze the welding stress and deformation.