A dual-mesh method for efficient thermal stress analysis of large-scale welded structures

Transient thermo-mechanical analysis of welding problem requires tremendous computation cost. To accelerate the thermal analysis of large-scale welded structures, an efficient computation scheme based on heat transfer localization and dual meshes was proposed. The computation accuracy is guaranteed by a local fine mesh model with size determined by a theoretical solution and a global coarse mesh model with equivalent heat input. The validity and accuracy of the dual-mesh method were verified using an experimental bead-on-plate model. By extending the weld length, the computation time of the proposed method was proved to be almost linearly dependent on the model scale. The thermal analysis of fillet welding of a large panel structure with 6-m-long weld was accelerated by 10 times over conventional finite element analysis and 2.2 times over adaptive mesh method. Meanwhile, the physical memory consumption was also greatly reduced by the dual-mesh method. Such efficient computation method enables fast evaluation of welding stress and distortion which are vital for manufacturing process and structure performance.

[1]  Wing Kam Liu,et al.  Improvement of mixed time implicit-explicit algorithms for thermal analysis of structures , 1983 .

[2]  Hongze Wang,et al.  Modeling of Temperature Distribution in Laser Welding of Lapped Martensitic Steel M1500 and Softening Estimation , 2016 .

[3]  D. Radaj Heat Effects of Welding: Temperature Field, Residual Stress, Distortion , 1992 .

[4]  Paul A. Colegrove,et al.  Thermo-mechanical analysis of Wire and Arc Additive Layer Manufacturing process on large multi-layer parts , 2011 .

[5]  Hui Huang,et al.  Development of Dynamic Mesh Refining Method for Large Scale Thermal and Mechanical Analysis in Welding and Line Heating , 2013 .

[6]  Hidekazu Murakawa,et al.  Prediction of residual stresses induced by low transformation temperature weld wires and its validation using the contour method , 2015 .

[7]  G. Cody,et al.  Apparatus for the Measurement of the Thermal Diffusivity of Solids at High Temperatures , 1960 .

[8]  J. E. Garnham,et al.  Review: Low transformation temperature weld filler for tensile residual stress reduction , 2014 .

[9]  Hidekazu Murakawa,et al.  Effect of jig constraint position and pitch on welding deformation , 2015 .

[10]  Lars-Erik Lindgren,et al.  FINITE ELEMENT MODELING AND SIMULATION OF WELDING PART 1: INCREASED COMPLEXITY , 2001 .

[11]  Hisashi Serizawa,et al.  Numerical and Experimental Investigations on Welding Deformation , 2008 .

[12]  Hui Huang,et al.  Iterative substructure method employing concept of inherent strain for large-scale welding problems , 2014, Welding in the World.

[13]  Ninshu Ma,et al.  An accelerated explicit method with GPU parallel computing for thermal stress and welding deformation of large structure models , 2016 .

[14]  Hisashi Serizawa,et al.  Development of Thermal Elastic-plastic FEM for Line Heating with Remeshing Technique , 2013 .

[15]  村川 英一,et al.  Welding deformation and residual stress prevention , 2012 .

[16]  Chaohua Zhang,et al.  Controlling angular distortion in high strength low alloy steel thick-plate T-joints , 2019, Journal of Materials Processing Technology.

[17]  Hisashi Serizawa,et al.  Fractal Multi-Grid Method for Ultra Large Scale Mechanical and Thermal Simulations , 2005 .

[18]  Michel Bellet,et al.  Adaptive mesh technique for thermal–metallurgical numerical simulation of arc welding processes , 2008 .

[19]  Satya N. Atluri,et al.  The meshless local Petrov-Galerkin method for the analysis of heat conduction due to a moving heat source, in welding , 2011 .

[20]  Zuheir Barsoum,et al.  Spectrum fatigue of high strength steel joints welded with low temperature transformation consumables , 2009 .

[21]  H. Runnemalm,et al.  Three-dimensional welding analysis using an adaptive mesh scheme ☆ , 2000 .

[22]  Guojun Zhang,et al.  Review on finite element analysis of welding deformation and residual stress , 2018 .

[23]  Hisashi Serizawa,et al.  Actual application of FEM to analysis of large scale mechanical problems in welding , 2007 .

[24]  Wu Aiping,et al.  Development and application of the adaptive mesh technique in the three-dimensional numerical simulation of the welding process , 2002 .