Terekhina, A.I., Plekhov, O.A., Kostina, A.A. et al. (1 more author) (2017) A comparison of the two approaches of the theory of critical distances based on linear-elastic and elasto-plastic analyses. IOP Conference Series: Materials Science and Engineering, 208. 12042. ISSN 1757-8981
Abstract
The problem of determining the strength of engineering structures, considering the effects of the non-local fracture in the area of stress concentrators is a great scientific and industrial interest. This work is aimed on modification of the classical theory of critical distance that is known as a method of failure prediction based on linear-elastic analysis in case of elasto-plastic material behaviour to improve the accuracy of estimation of lifetime of notched components. Accounting plasticity has been implemented with the use of the Simplified Johnson-Cook model. Mechanical tests were carried out using a 300 kN electromechanical testing machine Shimadzu AG-X Plus. The cylindrical un-notched specimens and specimens with stress concentrators of titanium alloy Grade2 were tested under tensile loading with different grippers travel speed, which ensured several orders of strain rate. The results of elasto-plastic analyses of stress distributions near a wide variety of notches are presented. The results showed that the use of the modification of the TCD based on elasto-plastic analysis gives us estimates falling within an error interval of ±5-10%, that more accurate predictions than the linear elastic TCD solution. The use of an improved description of the stress-strain state at the notch tip allows introducing the critical distances as a material parameter.
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Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence (https://creativecommons.org/licenses/by/3.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield) |
Funding Information: | Funder Grant number INSTITUTE OF STRATEGICALLY MATERIALS AND TECHNOLOGIES UNSPECIFIED |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 07 Jul 2017 10:02 |
Last Modified: | 07 Jul 2017 10:02 |
Published Version: | https://doi.org/10.1088/1757-899X/208/1/012042 |
Status: | Published |
Publisher: | IOP Publishing |
Refereed: | Yes |
Identification Number: | 10.1088/1757-899X/208/1/012042 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:118722 |
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