Optimised modelling of AISI 316L(N) material behaviour in the NeT TG4 international weld simulation and measurement benchmark

The NeT TG4 benchmark specimen consists of a three-pass type 316L Tungsten Inert Gas slot weld in a AISI type 316L(N) plate. Phase one of the finite element simulation round robin performed on TG4 by the NeT network made the assumption that weld metal exhibits the same mechanical behaviour as parent...

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Bibliographic Details
Published in:	The International journal of pressure vessels and piping Vol. 164; pp. 93 - 108
Main Authors:	Smith, Mike C., Muránsky, Ondrej, Austin, Colin, Bendeich, Phil, Xiong, Qingrong
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-07-2018
Subjects:	Finite element modelling Material hardening models Materials characterisation Weld modelling Welding Materials characterisation Material hardening models Finite element modelling Welding Weld modelling
Online Access:	Get full text
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Summary:	The NeT TG4 benchmark specimen consists of a three-pass type 316L Tungsten Inert Gas slot weld in a AISI type 316L(N) plate. Phase one of the finite element simulation round robin performed on TG4 by the NeT network made the assumption that weld metal exhibits the same mechanical behaviour as parent material. A comprehensive series of material characterisation tests on weld metal was performed by NeT participants, and these allowed the derivation of several sets of mixed isotropic-kinematic material model parameters specifically for weld metal. The derived models have been used to improve the predicted stresses in the TG4 benchmark specimen. This paper first reviews the weld metal materials testing programme, and then discusses the optimum material hardening model fitting strategy to use for austenitic weld metal. The derived material models are tested by using them to predict residual stresses in the TG4 benchmark, and validating the predictions against the extensive database of measured residual stresses. •Mixed isotropic-kinematic hardening material models yield the most accurate predictions of weld residual stresses in austenitic steels.•The model parameters for parent material should be optimised for the monotonic response.•The model parameters for weld metal should be optimised for the cyclic response.•The weld metal tested to generate model parameters should be solution-treated before testing to remove strain hardening.
ISSN:	0308-0161 1879-3541
DOI:	10.1016/j.ijpvp.2017.11.004