Efficient calculation technologies for welding stress and deformation with nonlinear and gradient character

The stress and deformation of welding have strong nonlinear and gradient characteristics,which calculation involves the nonlinear properties of materials,geometry and microstructures in the welded joint.It is extraordinarily 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 finite element method(FEM).However,the complicated process and high time-consuming for calculating the welding stress and deformation by the thermal elastic-plastic FEM need to be taken much attentions to research high efficient calculation technologies,and some calculation technologies have become the high efficient calculation technologies with strict academic and practical significance.The paper discusses and summarizes the state of the art,the classifications and development trend of the high efficiency calculation technologies.