A model of energy dissipation at fatigue crack tip in metals
Experimental and numerical studies investigating fatigue crack growth were conducted on flat samples made of stainless steel AISE 304 and titanium alloy Grade 2. The heat flux from the crack tip caused by plastic deformation localization was measured using the contact heat flux sensor previously dev...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2019-03-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/2294 |
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| author | Aleksei Vshivkov Oleg Plekhov Anastasiia Iziumova Balasubramaniam Venkatraman |
| author_facet | Aleksei Vshivkov Oleg Plekhov Anastasiia Iziumova Balasubramaniam Venkatraman |
| author_sort | Aleksei Vshivkov |
| collection | DOAJ |
| description | Experimental and numerical studies investigating fatigue crack growth were conducted on flat samples made of stainless steel AISE 304 and titanium alloy Grade 2. The heat flux from the crack tip caused by plastic deformation localization was measured using the contact heat flux sensor previously developed by the authors. This provides a possibility to find a correlation between energy dissipation and crack propagation rate under fatigue uniaxial loading with constant stress intensity factor and under biaxial loading with constant stress amplitude. The experiments with constant stress intensity factor have shown a decrease in energy dissipation at constant crack rate and R=-1 (R=0). A theoretical analysis of the stress field at the fatigue crack tip has been carried out to explain this phenomenon. Based on the obtained results, the heat flux from the crack tip is represented as the sum of two functions describing energy dissipation in monotonic and reversible plastic zones separately. It has been shown that dissipation in a reversible plastic zone is a function of the applied stress amplitude only. This causes energy dissipation to decrease at constant stress intensity factor. The proposed phenomenology was successfully verified by testing both materials under biaxial loading. |
| format | Article |
| id | doaj-art-443cfafdc2fc433e942a0dc51a0b6f2f |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2019-03-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-443cfafdc2fc433e942a0dc51a0b6f2f2025-01-03T00:40:24ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932019-03-011348A model of energy dissipation at fatigue crack tip in metalsAleksei Vshivkov0Oleg Plekhov1Anastasiia Iziumova2Balasubramaniam Venkatraman3Institute of Continuous Media Mechanics Russian Academy of Sciences Ural BranchInstitute of Continuous Media Mechanics Russian Academy of Sciences Ural BranchInstitute of Continuous Media Mechanics Russian Academy of Sciences Ural BranchIndira Gandhi Centre for Atomic ResearchExperimental and numerical studies investigating fatigue crack growth were conducted on flat samples made of stainless steel AISE 304 and titanium alloy Grade 2. The heat flux from the crack tip caused by plastic deformation localization was measured using the contact heat flux sensor previously developed by the authors. This provides a possibility to find a correlation between energy dissipation and crack propagation rate under fatigue uniaxial loading with constant stress intensity factor and under biaxial loading with constant stress amplitude. The experiments with constant stress intensity factor have shown a decrease in energy dissipation at constant crack rate and R=-1 (R=0). A theoretical analysis of the stress field at the fatigue crack tip has been carried out to explain this phenomenon. Based on the obtained results, the heat flux from the crack tip is represented as the sum of two functions describing energy dissipation in monotonic and reversible plastic zones separately. It has been shown that dissipation in a reversible plastic zone is a function of the applied stress amplitude only. This causes energy dissipation to decrease at constant stress intensity factor. The proposed phenomenology was successfully verified by testing both materials under biaxial loading.https://www.fracturae.com/index.php/fis/article/view/2294Fatigue crackDissipated energyPlastic deformation zone |
| spellingShingle | Aleksei Vshivkov Oleg Plekhov Anastasiia Iziumova Balasubramaniam Venkatraman A model of energy dissipation at fatigue crack tip in metals Fracture and Structural Integrity Fatigue crack Dissipated energy Plastic deformation zone |
| title | A model of energy dissipation at fatigue crack tip in metals |
| title_full | A model of energy dissipation at fatigue crack tip in metals |
| title_fullStr | A model of energy dissipation at fatigue crack tip in metals |
| title_full_unstemmed | A model of energy dissipation at fatigue crack tip in metals |
| title_short | A model of energy dissipation at fatigue crack tip in metals |
| title_sort | model of energy dissipation at fatigue crack tip in metals |
| topic | Fatigue crack Dissipated energy Plastic deformation zone |
| url | https://www.fracturae.com/index.php/fis/article/view/2294 |
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