Role of plasticity-induced crack closure in fatigue crack growth
The premature contact of crack surfaces attributable to the near-tip plastic deformations under cyclic loading, which is commonly referred to as plasticity induced crack closure (PICC), has long been focused as supposedly controlling factor of fatigue crack growth (FCG). Nevertheless, when the plane...
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Gruppo Italiano Frattura
2013-07-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero25/numero_25_art_19.pdf |
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| _version_ | 1832568701045440512 |
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| author | Jesús Toribio Viktor Kharin |
| author_facet | Jesús Toribio Viktor Kharin |
| author_sort | Jesús Toribio |
| collection | DOAJ |
| description | The premature contact of crack surfaces attributable to the near-tip plastic deformations under cyclic loading, which is commonly referred to as plasticity induced crack closure (PICC), has long been focused as supposedly controlling factor of fatigue crack growth (FCG). Nevertheless, when the plane-strain near-tip constraint is approached, PICC lacks of straightforward evidence, so that its significance in FCG, and even the very existence, remain debatable. To add insights into this matter, large-deformation elastoplastic simulations of plane-strain crack under constant amplitude load cycling at different load ranges and ratios, as well as with an overload, have been performed. Modeling visualizes the Laird-Smith conceptual mechanism of FCG by plastic blunting and re-sharpening. Simulation reproduces the experimental trends of FCG concerning the roles of stress intensity factor range and overload, but PICC has never been detected. Near-tip deformation patterns discard the filling-in a crack with material stretched out of the crack plane in the wake behind the tip as supposed PICC origin. Despite the absence of closure, load-deformation curves appear bent, which raises doubts about the trustworthiness of closure assessment from the compliance variation. This demonstrates ambiguities of PICC as a supposedly intrinsic factor of FCG and, by implication, favors the stresses and strains in front of the crack tip as genuine fatigue drivers. |
| format | Article |
| id | doaj-art-45a69f1ce343458c96abe729898cf705 |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2013-07-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-45a69f1ce343458c96abe729898cf7052025-02-03T00:44:09ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932013-07-0172513013710.3221/IGF-ESIS.25.19Role of plasticity-induced crack closure in fatigue crack growthJesús ToribioViktor KharinThe premature contact of crack surfaces attributable to the near-tip plastic deformations under cyclic loading, which is commonly referred to as plasticity induced crack closure (PICC), has long been focused as supposedly controlling factor of fatigue crack growth (FCG). Nevertheless, when the plane-strain near-tip constraint is approached, PICC lacks of straightforward evidence, so that its significance in FCG, and even the very existence, remain debatable. To add insights into this matter, large-deformation elastoplastic simulations of plane-strain crack under constant amplitude load cycling at different load ranges and ratios, as well as with an overload, have been performed. Modeling visualizes the Laird-Smith conceptual mechanism of FCG by plastic blunting and re-sharpening. Simulation reproduces the experimental trends of FCG concerning the roles of stress intensity factor range and overload, but PICC has never been detected. Near-tip deformation patterns discard the filling-in a crack with material stretched out of the crack plane in the wake behind the tip as supposed PICC origin. Despite the absence of closure, load-deformation curves appear bent, which raises doubts about the trustworthiness of closure assessment from the compliance variation. This demonstrates ambiguities of PICC as a supposedly intrinsic factor of FCG and, by implication, favors the stresses and strains in front of the crack tip as genuine fatigue drivers.http://www.gruppofrattura.it/pdf/rivista/numero25/numero_25_art_19.pdfCrack closureCrack-tip strainsFatigue cracking |
| spellingShingle | Jesús Toribio Viktor Kharin Role of plasticity-induced crack closure in fatigue crack growth Fracture and Structural Integrity Crack closure Crack-tip strains Fatigue cracking |
| title | Role of plasticity-induced crack closure in fatigue crack growth |
| title_full | Role of plasticity-induced crack closure in fatigue crack growth |
| title_fullStr | Role of plasticity-induced crack closure in fatigue crack growth |
| title_full_unstemmed | Role of plasticity-induced crack closure in fatigue crack growth |
| title_short | Role of plasticity-induced crack closure in fatigue crack growth |
| title_sort | role of plasticity induced crack closure in fatigue crack growth |
| topic | Crack closure Crack-tip strains Fatigue cracking |
| url | http://www.gruppofrattura.it/pdf/rivista/numero25/numero_25_art_19.pdf |
| work_keys_str_mv | AT jesustoribio roleofplasticityinducedcrackclosureinfatiguecrackgrowth AT viktorkharin roleofplasticityinducedcrackclosureinfatiguecrackgrowth |