焊接大梯度应力与变形高效计算技术研究

he welding stress and deformation exists strong nonlinear and gradient character, and its calculation depends significantly on the nonlinear properties of materials, geometry and microstructures in the welded joint. It is extraordinary important for understanding the mechanism of welding stress and deformation to investigate the welding thermal process and stress-strain development based on thermal elastic plastic FEM. However, the complicated process and high time-consuming of the welding stress and deformation calculation by the thermal elastic plastic FEM make it to be taken much attentions to investigate the high efficient calculation technologies for welding stress and deformation. And some important progresses with strict academic and practical significance have been obtained in the field. The state of the art has been summarized and the classifications and development trend of the high efficiency calculation technologies were discussed carefully in the paper.