Tarnowski, K. orcid.org/0000-0002-7870-7247, Dean, D.W., Nikbin, K.M. et al. (1 more author) (2017) Predicting the influence of strain on crack length measurements performed using the potential drop method. Engineering Fracture Mechanics, 182. pp. 635-657. ISSN 0013-7944
Abstract
The potential drop (PD) crack growth measurement technique is sensitive to strain accumulation which is often erroneously interpreted as crack extension. When testing ductile materials these errors can be significant, but in many cases the optimum method of minimising or supressing them remains unknown because it is extremely difficult to measure them experimentally in isolation from other sources of error, such non-ideal crack morphology. In this work a novel method of assessing the influence of strain on PD, using a sequentially coupled structural electrical finite element (FE) model, has been developed. By comparing the FE predictions with experimental data it has been demonstrated that the proposed FE technique is extremely effective at predicting trends in PD due to strain. It has been used to identify optimum PD configurations for compact tension, C(T), and single edge notched tension, SEN(T), fracture mechanics specimens and it has been demonstrated that the PD configuration often recommended for C(T) specimens can be subject to large errors due to strain accumulation. In addition, the FE technique has been employed to assess the significance of strain after the initiation of stable tearing for a monotonically loaded C(T) specimen. The proposed FE technique provides a powerful tool for optimising the measurement of crack initiation and growth in applications where large strains are present, e.g. J-R curve and creep crack growth testing.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Potential drop method; Crack initiation; Crack growth; Finite element analysis; Deformation |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 05 Jun 2018 11:36 |
Last Modified: | 05 Jun 2018 15:18 |
Published Version: | https://doi.org/10.1016/j.engfracmech.2017.06.008 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.engfracmech.2017.06.008 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:131435 |
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Filename: EFM 2016 - Predicting Influence of Strain on PD.pdf
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