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  • The potential drop method for monitoring crack growth in real components subjected to combined fatigue and creep conditions: application of FE techniques for deriving calibration curves

Abstract

Finite element analysis procedures are applied to optimise the potential drop technique (i.e. to determine the best location for the PD leads) and to provide calibrations curves. The validity of this procedure has been assessed in laboratory component tests under both thermal fatigue and multiaxial creep loading.

The potential drop (PD) technique is a robust method to provide continuous in-situ crack growth monitoring of real power-plant components. For a correct assessment of the crack depth, accurate calibration curves for the geometry at hand are required. The problem entails determining the electrical potential field in a body usually characterised by a complicated geometry as function of the growing crack. Finite element analysis procedures are firstly applied to optimise the technique (i.e. to determine the best location for the PD leads) and secondly to provide theoretical calibration curves. The validity of this procedure has been assessed in laboratory component tests under both thermal fatigue and multiaxial creep loading. Post-test measurements of the crack depth underline the accuracy of the FE calibration technique.

Additional information

Authors: GANDOSSI L, JRC-Institute for Advanced Materials, Petten (NL);SUMMERS S, JRC-Institute for Advanced Materials, Petten (NL);TAYLOR N, JRC-Institute for Advanced Materials, Petten (NL);HURST R, JRC-Institute for Advanced Materials, Petten (NL);HULM B, University of Wales, Swansee (UK);PARKER J, University of Wales, Swansee (UK)
Bibliographic Reference: An oral report given at: International "HIDA" Conference, Advances in Defect Assessment In High Temperature Plants. Organised by: MPA Stuttgart. Held at: Stuttgart, 4-6 October 2000
Record Number: 200013172 / Last updated on: 2001-03-20
Category: PUBLICATION
Original language: en
Available languages: en