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Crack Length Evaluation for Cyclic and Sustained Loading at High Temperature Using Potential Drop

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Abstract

Crack length evaluations for cyclic loading and sustained loading at high temperature and a mix of both have been conducted on Inconel 718 surface crack specimens at 550 ∘C. The choice of method for evaluating the crack length is seen to have a non-negligible impact on the resulting crack propagation rate values. In this paper, some aspects regarding how to evaluate such testing when using the potential drop technique are presented, with the aim of giving a firm explanation on how to proceed for the best possible result.

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Acknowledgments

The authors would like to thank Lic. Eng. Mattias Calmunger and Dr. Robert Eriksson, Linköping University, for the SEM support, Mr. Patrik Härnman and Mr. Bo Skoog, Linköping University, for the laboratory work, and the project teams at Linköping University, Siemens Industrial Turbomachinery AB and GKN Aerospace Engine Systems for valuable discussions. This research has been funded by the Swedish Energy Agency, Siemens Industrial Turbomachinery AB, GKN Aerospace Engine Systems, and the Royal Institute of Technology through the Swedish research programme TURBO POWER, the support of which is gratefully acknowledged.

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  1. Division of Solid Mechanics, Department of Management and Engineering, Linköping University, 58183, Linköping, Sweden

    E. Storgärds & K. Simonsson

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  1. E. Storgärds
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  2. K. Simonsson
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Correspondence to E. Storgärds.

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Storgärds, E., Simonsson, K. Crack Length Evaluation for Cyclic and Sustained Loading at High Temperature Using Potential Drop. Exp Mech 55, 559–568 (2015). https://doi.org/10.1007/s11340-014-9963-2

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  • DOI: https://doi.org/10.1007/s11340-014-9963-2

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