Ninshu Ma

TL;DR: In this article, the authors measured the residual stress of lap joints of thin steel sheets by the cosα X-ray diffraction method and compared with the numerical simulation, and found that the longitudinal residual stress in the region near the weld is close to the yield strength of the base metal.

TL;DR: Based on inherent strain theory and interface element formulation, the authors developed a practical prediction system to compute the accumulated distortion during the welding assembly process in the current study, using the developed prediction method, they calculated the welding distortion in a thin plate structure with considering both the shrinkage due to heat input and the gap/misalignment generated during assembly process.

TL;DR: In this paper, a 3D thermal elastic-plastic FEM program was employed to simulate the transient temperature and deformation occurred in the welding, and the effect of jig constraint on longitudinal shrinkage, transverse shrinkage and angular distortion was discussed.

TL;DR: In this paper, a local solid model and a global shell model were employed for fast prediction of deformation in laser welded thin sheets based on inherent strain theory Transient thermo-elastic-plastic analysis was performed on the local three-dimensional solid model to obtain inherent strain for the global shells model to ensure solution accuracy, the characteristics of the laser welding heat source were considered in determination of the mesh size and time increment.

TL;DR: Wang et al. as mentioned in this paper used a fast computing algorithm named iterative substructure method and an advanced material model with consideration of the influence of solid-state phase transformation to predict welding residual stress.