特厚板多层多道焊的Marc有限元模拟

Marc Finite Element Simulation in Special Thick Plate by Multi-pass and Multi-layer Welding

厚板焊接残余应力场的影响因素众多,变化复杂,其应力分布模型的研究是此领域的难点之一,有关的试验样本尚不多见。以两块100 mm的厚板焊接为研究对象,试验模型材质为A105钢,采用埋弧焊,进行多道焊接。采用试验测量和MSC.Marc有限元模拟相结合的方法,对100 mm特厚板多层多道焊的残余应力进行对比分析研究,给出上表面横向残余应力和纵向残余应力以及厚度方向残余应力的分布曲线。有限元计算结果与试验测量结果吻合较好,证明该有限元模型的合理性。特别地,厚度方向残余应力可以通过有限元模型计算得出,解决了实际工程中厚板内部应力难得出的问题,为进一步研究特厚板焊接残余应力提供参考依据。

Residual stress of thick plate welding is affected by many factors and varied complicatedly.The research of residual stress distribution model is one of the difficult points in this field,so the actual distribution measurement is very important.Two plates with thickness of 100 mm are presented,which are made of A105 steel,subjected to multi-pass weld with submerged automatic arc welding technology.Then experimental measurement and MSC.Marc finite element simulation are combined to analyze the welding residual stress distribution of 100 mm special thick plate by multi-pass and multi-layer welding.Then,distribution curves of transverse residual stress and longitudinal residual stress on the top surface,and along the thick direction are given.The finite element calculations are coincided with the experimental results,indicating that the finite element model established is reasonable.In particular,the residual stressin the thick direction can be gained by the finite element result,which solves the problem about residual stress is inconvenient to measure in the thick direction and offers reference for the future residual stress research work.