Fatigue Crack Growth in a Monocrystal and Its Similarity to Short-Crack Propagation in a Polycrystal of Nickel
Short fatigue cracks in polycrystalline materials are very important from both practical and basic aspects, yet they are very difficult to observe. Therefore, it is suggested to emulate some properties of short cracks with long fatigue cracks in monocrystals. Indeed, such experiments in pure nickel...
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| Format: | Article |
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MDPI AG
2023-04-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/4/790 |
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| author | Avihai Petel Ales Jager Dotan Babai Juergen Jopp Arie Bussiba Mordechai Perl Roni Z. Shneck |
| author_facet | Avihai Petel Ales Jager Dotan Babai Juergen Jopp Arie Bussiba Mordechai Perl Roni Z. Shneck |
| author_sort | Avihai Petel |
| collection | DOAJ |
| description | Short fatigue cracks in polycrystalline materials are very important from both practical and basic aspects, yet they are very difficult to observe. Therefore, it is suggested to emulate some properties of short cracks with long fatigue cracks in monocrystals. Indeed, such experiments in pure nickel crystals prove that the three peculiar properties of short fatigue cracks in polycrystalline metals are observed in long cracks in monocrystals, i.e., a lower threshold of the stress intensity factor (Δ<i>K<sub>I</sub></i>)<sub>th</sub>, a higher crack propagation rate at low Δ<i>K<sub>I</sub></i> regimes, and the fact that different cracks exhibit different growth behaviors. The fatigue experiments in monocrystals reveal interesting details of the slip activity at the front of fatigue cracks, including a selection rule for the active slip systems above and below the crack, the slip behavior under conditions of steep strain gradients, and the activation of a new slip system. |
| first_indexed | 2024-03-11T04:45:03Z |
| format | Article |
| id | doaj.art-ce18fd3cca134adda00fc29ead46b1dc |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T04:45:03Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-ce18fd3cca134adda00fc29ead46b1dc2023-11-17T20:27:44ZengMDPI AGMetals2075-47012023-04-0113479010.3390/met13040790Fatigue Crack Growth in a Monocrystal and Its Similarity to Short-Crack Propagation in a Polycrystal of NickelAvihai Petel0Ales Jager1Dotan Babai2Juergen Jopp3Arie Bussiba4Mordechai Perl5Roni Z. Shneck6Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer Sheva P.O. Box 653, IsraelDepartment of Mechanics, Faculty of Civil Engineering, Czech Technical University in Prague, Thkurova 7, 166 29 Prague, Czech RepublicDepartment of Materials Engineering, Ben Gurion University of the Negev, Beer Sheva P.O. Box 653, IsraelIlse Katz Institute for Nanoscale Science & Technology, Ben Gurion University of the Negev, Beer Sheva P.O. Box 653, IsraelNuclear Research Center Negev, Beer Sheva P.O. Box 9001, IsraelDepartment of Mechanical Engineering, Ben Gurion University of the Negev, Beer Sheva P.O. Box 653, IsraelDepartment of Materials Engineering, Ben Gurion University of the Negev, Beer Sheva P.O. Box 653, IsraelShort fatigue cracks in polycrystalline materials are very important from both practical and basic aspects, yet they are very difficult to observe. Therefore, it is suggested to emulate some properties of short cracks with long fatigue cracks in monocrystals. Indeed, such experiments in pure nickel crystals prove that the three peculiar properties of short fatigue cracks in polycrystalline metals are observed in long cracks in monocrystals, i.e., a lower threshold of the stress intensity factor (Δ<i>K<sub>I</sub></i>)<sub>th</sub>, a higher crack propagation rate at low Δ<i>K<sub>I</sub></i> regimes, and the fact that different cracks exhibit different growth behaviors. The fatigue experiments in monocrystals reveal interesting details of the slip activity at the front of fatigue cracks, including a selection rule for the active slip systems above and below the crack, the slip behavior under conditions of steep strain gradients, and the activation of a new slip system.https://www.mdpi.com/2075-4701/13/4/790short fatigue cracksfatigue crack propagationsingle crystals |
| spellingShingle | Avihai Petel Ales Jager Dotan Babai Juergen Jopp Arie Bussiba Mordechai Perl Roni Z. Shneck Fatigue Crack Growth in a Monocrystal and Its Similarity to Short-Crack Propagation in a Polycrystal of Nickel Metals short fatigue cracks fatigue crack propagation single crystals |
| title | Fatigue Crack Growth in a Monocrystal and Its Similarity to Short-Crack Propagation in a Polycrystal of Nickel |
| title_full | Fatigue Crack Growth in a Monocrystal and Its Similarity to Short-Crack Propagation in a Polycrystal of Nickel |
| title_fullStr | Fatigue Crack Growth in a Monocrystal and Its Similarity to Short-Crack Propagation in a Polycrystal of Nickel |
| title_full_unstemmed | Fatigue Crack Growth in a Monocrystal and Its Similarity to Short-Crack Propagation in a Polycrystal of Nickel |
| title_short | Fatigue Crack Growth in a Monocrystal and Its Similarity to Short-Crack Propagation in a Polycrystal of Nickel |
| title_sort | fatigue crack growth in a monocrystal and its similarity to short crack propagation in a polycrystal of nickel |
| topic | short fatigue cracks fatigue crack propagation single crystals |
| url | https://www.mdpi.com/2075-4701/13/4/790 |
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