船体加筋板结构焊接变形和残余应力热弹塑性有限元分析

Thermal elastic-plastic FEM analysis of welding deformation and residual stress of a stiffened plate structure in hull

为提高焊接热弹塑性数值模拟的效率,采用静态子结构方法实现焊接热传导分析计算。根据船体加筋板结构的重复性和对称性特点,将整个结构根据加强筋划分为若干相同的静态子结构,计算得到1条焊缝的温度分布后,通过温度场的镜像和平移获得整个结构的温度场。以船体加筋板为例,采用静态子结构方法并结合温度场的镜像和平移技术,计算分析船体加筋板的焊接温度场和应力场结果。计算表明,该方法在保证计算精度的前提下,极大地提高了计算效率。

In order to improve the efficiency of thermal elastic plastic finite element method（TEP FEM）, the static substructure method is adopted to fulfill heat transfer analysis of welding process. The overall stiffened plate structure is divided into several uniform static substructures according to its repeatability and symmetry. Heat transfer analysis of one substructure welding is implemented by means of TEP FEM and then the temperature fields of other substructure welding are obtained via mirroring and translation from the calculated results. The static substructure method is applied to the welding simulation of a stiffened plate structure in hull and good agreements of thermal and mechanical results are obtained. The efficiency of the proposed approach is proved extremely high compared with the existed method.