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Welded components and the resulting toes and roots of the weld joints are often subject to multiaxial loading conditions and fatigue issues. This also affects nuclear reactor internals subject to loads in the LCF (thermal transients), HCF and VHCF (vibrations) regime. As part of this work, the welded joint of a nuclear reactor exemplary component was replicated using a component-like specimen. Fatigue tests at variable amplitude loading (derived from typical operational loading conditions) were carried out after fatigue tests at a constant displacement amplitude.
In FEA, a multilinear-kinematic-elastic-plastic material model was implemented and adapted to experimental data of unnotched and polished fatigue specimens of the base metals AISI 304L and AISI 347 as well as the…
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Welded components and the resulting toes and roots of the weld joints are often subject to multiaxial loading conditions and fatigue issues. This also affects nuclear reactor internals subject to loads in the LCF (thermal transients), HCF and VHCF (vibrations) regime. As part of this work, the welded joint of a nuclear reactor exemplary component was replicated using a component-like specimen. Fatigue tests at variable amplitude loading (derived from typical operational loading conditions) were carried out after fatigue tests at a constant displacement amplitude.
In FEA, a multilinear-kinematic-elastic-plastic material model was implemented and adapted to experimental data of unnotched and polished fatigue specimens of the base metals AISI 304L and AISI 347 as well as the weld metal ER 347. The weld toe was modelled using an equivalent radius of 1 mm as it is commonly done in the framework of (elastic) notch stress approaches [1]. The resulting multiaxial loading conditions were evaluated using elasto-plastic energy- and strain-based fatigue damage parameters (FDP). The calculated FDP were then compared with the FDP-fatigue life curves of unnotched specimens to calculate an analytical fatigue lifetime. These calculated values were finally compared with the experimental lifetime. This allows for some quality assessment of the FDPs.
The energy-based FDPFGF predicted the fatigue life at constant ampitude loading (CAL) with satisfactory accuracy, considering the fact that the fatigue specimen were welded component like specimen [3]. This FDP stood out, particularly with regard to the consideration of multiaxiality and gradient effects [3].This applies to the LCF, HCF and VHCF regime. If loads in these ranges are now combined, the service life prediction in the LCF and HCF range is still satisfactorily accurate even at VAL. However, the results with subsequent loads in the VHCF range show an increased scatter and the need to improve the assessment in the VHCF regime.