Stress accurate framework for the numerical simulation of FSW processes
Visualitza/Obre
PAper - FSW-2014.pdf (1,142Mb) (Accés restringit)
Sol·licita una còpia a l'autor
Què és aquest botó?
Aquest botó permet demanar una còpia d'un document restringit a l'autor. Es mostra quan:
- Disposem del correu electrònic de l'autor
- El document té una mida inferior a 20 Mb
- Es tracta d'un document d'accés restringit per decisió de l'autor o d'un document d'accés restringit per política de l'editorial
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/170653
Tipus de documentText en actes de congrés
Data publicació2014
Condicions d'accésAccés restringit per política de l'editorial
Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i
industrial corresponents. Sense perjudici de les exempcions legals existents, queda prohibida la seva
reproducció, distribució, comunicació pública o transformació sense l'autorització del titular dels drets
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.
CitacióDialami, 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.
ISBN9781510800250
Col·leccions
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
PAper - FSW-2014.pdf | 1,142Mb | Accés restringit |