Session: MF-03-01 Welding Residual Stress and Distortion Simulation and Measurement-1

Paper Number: 155529

155529 - Net-Tg6 Nickel-Based Alloy Simulation: Calibration and Experimental Validation 

Abstract: 

The European NeT collaborative network aims to provide experimental and numerical standards for residual stresses prediction and measurement in welded structures. This is done through several studies involving experimental mock-ups manufactured by the network partners and their numerical simulations performed with different Finite Element codes, such as code_aster, Abaqus or SYSWELD. One of these benchmarks is the Task Group 6 (TG6), a nickel-based alloy specimen consisting of an Alloy 600 plate with a slot filled by three Alloy 82 beads.

In this work, a new TG6 simulation is presented. The TIG welding fabrication process is modeled as a weakly-coupled non-linear thermo-mechanical problem. The heat transfer problem has been calibrated using the data from 9 manufactured plates that were instrumented with 12 thermocouples. Each pass is calibrated individually using state of the art multi-objective optimization. The results are compared to a macrograph of the fusion zone after the 3 passes.

The mechanical behavior is modeled using a Lemaitre-Chaboche visco-elasto-plastic formulation, following Akrivos’ material characterization work in [1]. The numerical results are compared to several neutron diffraction residual stress measurements and show good agreement between them.

[1] Akrivos, V. "Accurate Constitutive Behaviour for the Prediction of Weld Residual Stresses in Nickel-Based Alloy 600/82 Weldments Validated by Characterization Studies." (2018).

Presenting Author: Pablo Pereira Alvarez EDF

Presenting Author Biography: Pablo Pereira Alvarez holds a degree in Applied Mathematics from Sorbonne Université. After finishing his PhD on real time prediction of mechanical stresses in welding at Mines Paris PSL in 2022, Pablo currently works at EDF's (Electricité de France) R&D division as a research engineer. His main research topics are model order reduction, surrogate modeling and data assimilation applied to numerical simulation of welding.

Authors:

Pablo Pereira Alvarez EDF
Josselin Delmas EDF
Sofiane Hendili EDF