A single weld bead deposited on a flat plate is a deceptively simple problem that is in practice a challenge for both measurement and prediction of weld residual stresses. Task Group 1 of the NeT collaborative network has examined this problem in an extensive programme of measurement and simulation extending from 2002 to 2008. As a result, the NeT bead on plate forms an ideal benchmark problem for the development of weld residual stress simulation techniques. One of the conclusions of NeT Task Group 1 is that the most accurate predictions of weld residual stresses in austenitic steels are achieved using mixed isotropic-kinematic material constitutive models. However, the use of these models can require both extensive materials data, and compromises in fitting either the monotonic or cyclic responses. This paper reports a detailed matrix of sensitivity studies aimed at optimising the behaviour of mixed hardening models in welding simulation, using the Lemaitre-Chaboche formulation in the ABAQUS finite element code. Predicted stresses and strains in the NeT bead on plate specimen are compared with the extensive database of residual stress measurements. Further studies examine sensitivity to the handling of high temperature inelastic strains, using a novel two-stage annealing functionality implemented within ABAQUS. The results show that, overall, the most accurate predictions are made if the Lemaitre-Chaboche parameters are optimised to fit the monotonic response over the first 2% of plastic strain. However, further improvements in prediction could be achieved if the constitutive model were capable of independently fitting both the monotonic and saturated cyclic response of the material.
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ASME 2009 Pressure Vessels and Piping Conference
July 26–30, 2009
Prague, Czech Republic
Conference Sponsors:
- Pressure Vessels and Piping
ISBN:
978-0-7918-4369-7
PROCEEDINGS PAPER
Optimisation of Mixed Hardening Material Constitutive Models for Weld Residual Stress Simulation Using the NeT Task Group 1 Single Bead on Plate Benchmark Problem
Michael C. Smith,
Michael C. Smith
British Energy Generation Ltd., Barnwood, Gloucester, UK
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Brahim Nadri,
Brahim Nadri
University of Bristol, Bristol, UK
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Ann C. Smith,
Ann C. Smith
AREVA NP SAS, Paris La Defense, France
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David G. Carr,
David G. Carr
Australian Nuclear Science and Technology Organisation (ANSTO), Menai, NSW, Australia
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Philip J. Bendeich,
Philip J. Bendeich
Australian Nuclear Science and Technology Organisation (ANSTO), Menai, NSW, Australia
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Lyndon E. Edwards
Lyndon E. Edwards
Australian Nuclear Science and Technology Organisation (ANSTO), Menai, NSW, Australia
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Michael C. Smith
British Energy Generation Ltd., Barnwood, Gloucester, UK
Brahim Nadri
University of Bristol, Bristol, UK
Ann C. Smith
AREVA NP SAS, Paris La Defense, France
David G. Carr
Australian Nuclear Science and Technology Organisation (ANSTO), Menai, NSW, Australia
Philip J. Bendeich
Australian Nuclear Science and Technology Organisation (ANSTO), Menai, NSW, Australia
Lyndon E. Edwards
Australian Nuclear Science and Technology Organisation (ANSTO), Menai, NSW, Australia
Paper No:
PVP2009-77158, pp. 303-318; 16 pages
Published Online:
July 9, 2010
Citation
Smith, MC, Nadri, B, Smith, AC, Carr, DG, Bendeich, PJ, & Edwards, LE. "Optimisation of Mixed Hardening Material Constitutive Models for Weld Residual Stress Simulation Using the NeT Task Group 1 Single Bead on Plate Benchmark Problem." Proceedings of the ASME 2009 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication, Parts A and B. Prague, Czech Republic. July 26–30, 2009. pp. 303-318. ASME. https://doi.org/10.1115/PVP2009-77158
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