Plasticity-induced crack closure in the presence of loading irregularities in short cracks initiated at interior defects
Kärkkäinen, Kimmo; Vaara, Joona; Frondelius, Tero (2024-05-06)
Elsevier
06.05.2024
Kimmo Kärkkäinen, Joona Vaara, Tero Frondelius, Plasticity-induced crack closure in the presence of loading irregularities in short cracks initiated at interior defects, Procedia Structural Integrity, Volume 57, 2024, Pages 271-279, ISSN 2452-3216, https://doi.org/10.1016/j.prostr.2024.03.029
https://creativecommons.org/licenses/by-nc-nd/4.0/
© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
https://creativecommons.org/licenses/by-nc-nd/4.0/
© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
https://creativecommons.org/licenses/by-nc-nd/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202406134454
https://urn.fi/URN:NBN:fi:oulu-202406134454
Tiivistelmä
Abstract
A crack propagation finite-element model of interior defect-initiated short cracks under near-threshold loading conditions is used to investigate the effect of plasticity-induced crack closure in the presence of a single overload and underload. The effect of an overload predicted by the present model is qualitatively very similar to what is commonly reported, but in this case an underload produces a differing result to the literature consensus, yielding a similar but weaker effect as the overload. Extended acceleration of crack propagation due to a single underload might not be attributable to plasticity-induced crack closure under plane strain conditions. A distinct crack profile shape consequent of crack tip blunting is present with both loading irregularities. A new method for examining crack closure for the entire crack surface is presented.
A crack propagation finite-element model of interior defect-initiated short cracks under near-threshold loading conditions is used to investigate the effect of plasticity-induced crack closure in the presence of a single overload and underload. The effect of an overload predicted by the present model is qualitatively very similar to what is commonly reported, but in this case an underload produces a differing result to the literature consensus, yielding a similar but weaker effect as the overload. Extended acceleration of crack propagation due to a single underload might not be attributable to plasticity-induced crack closure under plane strain conditions. A distinct crack profile shape consequent of crack tip blunting is present with both loading irregularities. A new method for examining crack closure for the entire crack surface is presented.
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