Application of multi-phase viscoplastic material modelling to computational welding mechanics of grade-s960ql steel

Nicolas Häberle; Andreas Pittner; Rainer Falkenberg; Ole Kahlcke; Michael Rethmeier

doi:10.1016/j.crme.2018.08.001

Computational methods in welding and additive manufacturing/Simulation numérique des procédés de soudage et de fabrication additive

Application of multi-phase viscoplastic material modelling to computational welding mechanics of grade-s960ql steel

Nicolas Häberle ¹ ; Andreas Pittner ¹ ; Rainer Falkenberg ¹ ; Ole Kahlcke ¹ ; Michael Rethmeier ¹

¹ Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany

Comptes Rendus. Mécanique, Volume 346 (2018) no. 11, pp. 1018-1032.

Résumé

The sound numerical prediction of welding-induced thermal stresses, residual stresses, and distortions strongly depends on the accurate description of a welded material's thermomechanical deformation behaviour. In this work, we provide experimental data on the viscoplastic deformation behaviour of a grade-s960ql steel up to a temperature of $1000 {}^{\circ}C$ . In addition, a multi-phase viscoplastic material model is proposed, which accounts for the experimentally observed isothermal deformation behaviour of grade-s960ql steel base and austenitised material, as well as for athermal contributions that originate from solid-state phase transformations. The multi-phase viscoplastic and a classic rate-independent isotropic hardening material model were applied in the numerical simulations of both-ends-fixed bar Satoh tests and a single-pass gas metal arc weld. The influence of material modelling choices on the agreement between numerical simulation and experimental results is discussed, and recommendations for further work are given.

Reçu le : 2017-12-15
Accepté le : 2018-03-19
Publié le : 2018-08-23

DOI : 10.1016/j.crme.2018.08.001

Mots clés : Computational welding mechanics, s960ql, Cyclic hardening, Viscoplasticity, Complex low-cycle fatigue test, Satoh test

Affiliations des auteurs :

Nicolas Häberle ¹ ; Andreas Pittner ¹ ; Rainer Falkenberg ¹ ; Ole Kahlcke ¹ ; Michael Rethmeier ¹

¹ Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany

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     author = {Nicolas H\"aberle and Andreas Pittner and Rainer Falkenberg and Ole Kahlcke and Michael Rethmeier},
     title = {Application of multi-phase viscoplastic material modelling to computational welding mechanics of grade-s960ql steel},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {1018--1032},
     publisher = {Elsevier},
     volume = {346},
     number = {11},
     year = {2018},
     doi = {10.1016/j.crme.2018.08.001},
     language = {en},
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Nicolas Häberle; Andreas Pittner; Rainer Falkenberg; Ole Kahlcke; Michael Rethmeier. Application of multi-phase viscoplastic material modelling to computational welding mechanics of grade-s960ql steel. Comptes Rendus. Mécanique, Volume 346 (2018) no. 11, pp. 1018-1032. doi : 10.1016/j.crme.2018.08.001. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2018.08.001/

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