dc.contributor |
Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental |
dc.contributor |
Universitat Politècnica de Catalunya. RMEE - Grup de Resistència de Materials i Estructures en l'Enginyeria |
dc.contributor.author |
Dialamishabankareh, Narges |
dc.contributor.author |
Chiumenti, Michèle |
dc.contributor.author |
Cervera Ruiz, Miguel |
dc.contributor.author |
Agelet de Saracibar Bosch, Carlos |
dc.date |
2014 |
dc.identifier.citation |
Dialami, N. [et al.]. Stress accurate framework for the numerical simulation of FSW processes. A: International Friction Stir Welding Symposium. "10th International Symposium on Friction Stir Welding 2014". 2014, p. 603-620. |
dc.identifier.citation |
9781510800250 |
dc.identifier.uri |
http://hdl.handle.net/2117/170653 |
dc.language.iso |
eng |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures |
dc.subject |
Friction stir welding |
dc.subject |
Soldadura per fricció -- Mètodes de simulació |
dc.title |
Stress accurate framework for the numerical simulation of FSW processes |
dc.type |
info:eu-repo/semantics/publishedVersion |
dc.type |
info:eu-repo/semantics/conferenceObject |
dc.description.abstract |
In this work, the numerical simulation of the FSW process is tackled by means of an Arbitrary-Lagrangian-Eulerian (ALE) formulation. The computational domain is split into three different zones: the work-piece (defined by a rigid visco-plastic behaviour in the Eulerian framework), the pin (within the Lagrangian framework) and finally the stir-zone (ALE formulation). A fully coupled thermo-mechanical analysis is performed accounting for the heat flux generated by the plastic dissipation in the stir-zone (Sheppard-Wright and Norton-Hoff rigid-visco-plastic constitutive models) as well as the frictional dissipation at the contact interface (Norton’s frictional contact model). The highly non-linear stress field typically encountered in FSW processes is worked out by means of a novel FE technology based on a three-field, velocity/dev(stresses)/pressure), mixed formulation. The result is an enhanced stress field approximation which enables for stress-accurate results in non-linear computational mechanics. The use of an independent nodal variable for the pressure field allows for an ad-hoc treatment of the incompressibility constraint. This is a mandatory requirement due to the isochoric nature of the visco-plastic strains in FSW processes. Finally, tracers have been implemented to show the material flow around the pin allowing a better understanding of the welding mechanism. The result is an accurate and robust methodology to study the FSW problem allowing for a clear visualization of the material behaviour at the stir-zone leading to a better understanding of the welding process itself. The results obtained from the proposed numerical simulation strategy are compared with the experimental evidence. |