Local–global strategy for the prediction of residual stresses in FSW processes
| Autor: | C. Agelet de Saracibar, Narges Dialami, Miguel Cervera, Michele Chiumenti |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. RMEE - Grup de Resistència de Materials i Estructures en l'Enginyeria |
| Rok vydání: | 2017 |
| Předmět: |
0209 industrial biotechnology
Engineering Heat-affected zone Finite element method Engineering Civil Coupled thermo-mechanical analysis Constitutive equation Engineering Multidisciplinary 02 engineering and technology Welding Industrial and Manufacturing Engineering law.invention ALE framework Residual stresses 020901 industrial engineering & automation Enginyeria mecànica [Àrees temàtiques de la UPC] law Residual stress Soldadura -- Matemàtica Friction stir welding Engineering Ocean Engineering Aerospace Engineering Biomedical business.industry Mechanical Engineering FSW Matemàtiques i estadística::Anàlisi numèrica::Mètodes numèrics [Àrees temàtiques de la UPC] Structural engineering 021001 nanoscience & nanotechnology Computer Science Software Engineering Engineering Marine Computer Science Applications Local-global analysis Engineering Manufacturing Engineering Mechanical Local analysis Control and Systems Engineering Heat generation Engineering Industrial 0210 nano-technology business Software Welding -- Mathematics |
| Zdroj: | Scipedia Open Access Scipedia SL UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Recercat. Dipósit de la Recerca de Catalunya instname |
| Popis: | The final publication is available at Springer via http://dx.doi.org/10.1007/s00170-016-9016-3 This work describes the local–global strategy proposed for the computation of residual stresses in friction stir welding (FSW) processes. A coupling strategy between the analysis of the process zone nearby the pin tool (local level analysis) and the simulation carried out for the entire structure to be welded (global level analysis) is implemented to accurately predict the temperature histories and, thereby, the residual stresses in FSW. As a first step, the local problem solves the material stirring as well as the heat generation induced by the pin and shoulder rotation at the heat affected zone. The Arbitrary Lagrangian Eulerian (ALE) formulation is adopted to deal with the rotation of complex pin shapes. A thermo-rigid-viscoplastic constitutive law is employed to characterize the viscous flow of the material, driven by the high-strain rates induced by the FSW process. A mixed temperature–velocity–pressure finite element technology is used to deal with the isochoric nature of the strains. The output of this local analysis is the heat generated either by plastic dissipation or by friction, and it is used as the power input for the welding analysis at structural (global) level. The global problem is tackled within the Lagrangian framework together with a thermo-elasto-viscoplastic constitutive model. In addition, in this case, the mixed temperature–displacement–pressure format is introduced to deal with the deviatoric nature of the plastic strains. The outcomes of this analysis are the distortions and the residual stresses after welding. The material used in this work is stainless steel 304 L; however, the methodology presented is applicable to a wide range of materials. The proposed numerical strategy is validated by the experimental evidence. |
| Databáze: | OpenAIRE |
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