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Metals 2017, 7(4), 136; doi:10.3390/met7040136

Residual Stresses with Time-Independent Cyclic Plasticity in Finite Element Analysis of Welded Joints

1
Department of Mechanical Engineering, University of La Rioja, 26006 Logroño, Spain
2
Rural Engineering Department and Projects, Public University of Navarre, 31006 Pamplona, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Filippo Berto
Received: 21 December 2016 / Revised: 5 April 2017 / Accepted: 6 April 2017 / Published: 13 April 2017
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Abstract

Due to the intense concentration of heat in a reduced area when Gas Metal Arc Welding (GMAW) is used to join mechanical components, the regions near the weld bead are subjected to severe thermal cycles. Firstly, the region close to the weld bead that is heated tends to be in compression and, when it cools, tends to be in tension. According to Pilipenko, the material is exposed to elastic compression and, then, reaching the yield limit, undergoes plastic deformation with the appearance of residual stresses followed by elastic-plastic unloading. This could be considered as a strain-stress cycle. This paper applies plastic-strain-range memorization based on time-independent cyclic plasticity theory for butt joints with single V-groove Finite Element (FE) models that were manufactured by GMAW. The theory combines both the isotropic hardening and the nonlinear kinematic hardening rule (Chaboche model) to reproduce the behavior of cyclic plasticity and thus to obtain the residual stresses in welded joint FE models. As a practical example, the proposed theory is validated by three welded joint specimens that were manufactured with different input parameters of speed, voltage, and current. An agreement between the residual stresses obtained by the FE model proposed and those obtained experimentally by the hole drilling method at different depths demonstrates that the proposed theory could be valid for modelling the residual stresses in welded joints when cyclic plasticity is considered over the range of speed, voltage, and current studied. View Full-Text
Keywords: finite element analysis; GMAW welded joints; time-independent cyclic plasticity; Chaboche model finite element analysis; GMAW welded joints; time-independent cyclic plasticity; Chaboche model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lostado Lorza, R.; Corral Bobadilla, M.; Martínez Calvo, M.Á.; Villanueva Roldán, P.M. Residual Stresses with Time-Independent Cyclic Plasticity in Finite Element Analysis of Welded Joints. Metals 2017, 7, 136.

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