Tarnowski, K.M. orcid.org/0000-0002-7870-7247, Davies, C.M., Nikbin, K.M. et al. (1 more author) (2017) Experimental Determination of Elastic and Plastic LLD Rates During Creep Crack Growth Testing. In: ASME 2017 Pressure Vessels and Piping Conference. ASME 2017 Pressure Vessels and Piping Conference, 16-20 Jul 2017, Waikoloa, Hawaii, USA. The American Society of Mechanical Engineers ISBN 978-0-7918-5799-1
Abstract
Elastic and plastic load line displacement (LLD) rates are often ignored when analyzing Creep Crack Growth (CCG) tests due to difficulties in accurately determining their value for complex crack morphologies typical of creep. Instead, the total LLD rate is assumed to be entirely due to creep. This simplistic approach overestimates the crack tip characterizing parameter C* which is non-conservative.
This paper presents a review of the current method of interpreting CCG test data in ASTM E1457 and proposes an improved approach which accounts for the elastic and plastic LLD rates. Estimations of the elastic and plastic LLD rate are obtained from a partial unload immediately after load-up and a full unload, at the end of the test, prior to final failure. Some finite element validation of this method is presented. Implementing this approach will facilitate more realistic CCG laws.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 by ASME |
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 11:01 |
Last Modified: | 23 Feb 2024 16:12 |
Published Version: | https://doi.org/10.1115/PVP2017-65685 |
Status: | Published |
Publisher: | The American Society of Mechanical Engineers |
Refereed: | Yes |
Identification Number: | 10.1115/PVP2017-65685 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:131433 |