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...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2019-04-01
|
| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | https://www.fracturae.com/index.php/fis/article/view/2294/2432 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841562963937329152 |
|---|---|
| author | Oleg Plekhov Aleksei Vshivkov Anastasia Iziumova Balasubramaniam Venkatraman |
| author_facet | Oleg Plekhov Aleksei Vshivkov Anastasia Iziumova Balasubramaniam Venkatraman |
| author_sort | Oleg Plekhov |
| 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 stress ratio R=smin/smax=-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 a decrease of energy dissipation at constant stress intensity factor. The proposed phenomenology was successfully verified by testing both materials under biaxial loading. |
| format | Article |
| id | doaj-art-f40772b7cc0d4faeb4cb9445c9bf8566 |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2019-04-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-f40772b7cc0d4faeb4cb9445c9bf85662025-01-03T00:39:24ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932019-04-01134845145810.3221/IGF-ESIS.48.4310.3221/IGF-ESIS.48.43A model of energy dissipation at fatigue crack tip in metalsOleg PlekhovAleksei VshivkovAnastasia IziumovaBalasubramaniam VenkatramanExperimental 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 stress ratio R=smin/smax=-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 a decrease of energy dissipation 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/2294/2432Fatigue crackDissipated energyPlastic deformation zone |
| spellingShingle | Oleg Plekhov Aleksei Vshivkov Anastasia 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/2294/2432 |
| work_keys_str_mv | AT olegplekhov amodelofenergydissipationatfatiguecracktipinmetals AT alekseivshivkov amodelofenergydissipationatfatiguecracktipinmetals AT anastasiaiziumova amodelofenergydissipationatfatiguecracktipinmetals AT balasubramaniamvenkatraman amodelofenergydissipationatfatiguecracktipinmetals AT olegplekhov modelofenergydissipationatfatiguecracktipinmetals AT alekseivshivkov modelofenergydissipationatfatiguecracktipinmetals AT anastasiaiziumova modelofenergydissipationatfatiguecracktipinmetals AT balasubramaniamvenkatraman modelofenergydissipationatfatiguecracktipinmetals |