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Numerical evaluation of temperature fields and residual stresses in butt weld joints and comparison with experimental measurements
  • +1
  • Raffaele Sepe,
  • Alessandro De Luca,
  • Alessandro Greco,
  • Enrico Armentani
Raffaele Sepe
University of Salerno Department of Industrial Engineering
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Alessandro De Luca
University of Campania Luigi Vanvitelli Department of Engineering
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Alessandro Greco
University of Campania Luigi Vanvitelli Department of Engineering
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Enrico Armentani
University of Naples Federico II Department of Chemical Engineering Materials and Industrial Production
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Abstract

This paper presents a novel numerical model, based on the Finite Element (FE) method, for the simulation of a welding process aimed to make a two-passes V-groove butt joint. Specifically, a particular attention has been paid on the prediction of the residual stresses and distortions caused by the welding process. At this purpose, an elasto-plastic temperature dependent material model and the “element birth and death” technique, for the simulation of the weld filler supply over the time, have been considered within this paper. The main advancement with respect to the State of the Art herein proposed concerns the development of a modelling technique able to simulate the plates interaction during the welding operation when an only plate is modelled, taking advantage of the symmetry of the joint; this phenomenon is usually neglected in such type of prediction models because of their complexity. Problems arising in the development of this modelling technique have been widely described and solved herein: transient thermal field generated by the welding process introduces several deformations inside the plates, leading to their interaction, never faced in literature. Moreover, the heat amount is supplied to the finite elements as volumetric generation of the internal energy, allowing overcoming the time-consuming calibration phase needed to use the Goldak’s model, commonly adopted in literature. The proposed FE modelling technique has been established against an experimental test, with regard to the temperatures field and to the joint distortion. Predicted results showed a good agreement with experimental ones. Finally, the residual stresses distribution in the joint has been evaluated.

Peer review status:ACCEPTED

30 Jul 2020Submitted to Fatigue & Fracture of Engineering Materials & Structures
30 Jul 2020Submission Checks Completed
30 Jul 2020Assigned to Editor
31 Jul 2020Reviewer(s) Assigned
22 Aug 2020Review(s) Completed, Editorial Evaluation Pending
25 Aug 2020Editorial Decision: Revise Minor
30 Aug 20201st Revision Received
31 Aug 2020Submission Checks Completed
31 Aug 2020Assigned to Editor
31 Aug 2020Reviewer(s) Assigned
31 Aug 2020Review(s) Completed, Editorial Evaluation Pending
07 Sep 2020Editorial Decision: Accept