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.

Abstract

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.

Received: 2017-12-15
Accepted: 2018-03-19
Published online: 2018-08-23

DOI: 10.1016/j.crme.2018.08.001

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

Author's affiliations:

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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