Estimation of Welding Residual Stress by Taking into Account the Mismatch of Material Plasticity and Joint Stiffness
考虑塑性和刚度不匹配的焊接残余应力估算

In existing residual stress calculation, there is a big deviation between the calculation results and actual residual stress of welding residual stress, due to not taking into account the effects of material plastic deformation and welded joint stiffness mismatch. Based on residual stress test of 2219-T87 TIG welded joints, a residual stress calculation method is put forward in this paper to study the effect of material plastic deformation and joint stiffness mismatch on the welding residual stress by using nonlinear finite element and the residual stress-release strain curve in material elastic modulus partition. Results show that the mismatch of non-homogeneous material plasticity in welded joints may cause large error in residual stress calculation, and the impact of the residual stress of plastic deformation is greater than that of the joint stiffness mismatch. The proposed method may modify the error due to taking into account the mismatch of non-homogeneous material plasticity in welded joints.