ENBIS-12 in Ljubljana

9 – 13 September 2012 Abstract submission: 15 January – 10 May 2012

Sensitivity Analysis of a Welding Thermomechanical Simulation Model

11 September 2012, 17:10 – 17:30

Abstract

Submitted by
Anne-Laure Popelin
Authors
Anne-Laure Popelin (EDF R&D), Leila Guenad (EDF R&D), Bertrand Iooss (EDF R&D)
Abstract
Numerical welding simulation is based on the definition of a thermomechanical model and uses the finite element method. It aims to assess residual stresses from welding, which is a major issue in estimating life time of welded components. Modeling welding operation requires the characterization of material and operative parameters. Materials input data must be defined of the ambient temperature to the melting temperature. Such data are poorly known at high temperatures and involve many uncertainties. Currently, their impact on the residual stresses is difficult to assess. The determination of the most influential parameters on the residual stresses would therefore provide an estimate of the latter faster through the knowledge of the most powerful parameter.
This study concerns the numerical computation of the residual stresses generated in a test plate by the fusion welding process. The experiment consisted in the deposit of a weld bead along the longitudinal centre-line of an austenitic 316L plate using an automatic Tungsten Inert Gas (TIG) welding process with 316L filler material.
A global sensitivity analysis is applied to this numerical welding simulation model in order to rank the importance of input variables on the outputs of the code like residual stresses. A specific method of sensitivity analysis is chosen in function of the main characteristics of the problem: the number of input variables can be large, the output variables are spatially distributed, and only a small number of model runs can be done. Visualization tools help to summarize useful information in understandable mesh-based graphs, so that decisions can be taken more easily.
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