Initial orientation of the fretting fatigue cracks in shrink-fit connection specimens
The bending configuration of shrink-fitted connection fretting fatigue tests causes a fluctuation in the contact pressure and in turn a more favourable condition for shear, rather than tensile, crack initiation. According to the classification type I (shear) and type II (tensile) fretting cracks, ty...
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Gruppo Italiano Frattura
2019-04-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/2288/2430 |
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| author | Ciro Santus |
| author_facet | Ciro Santus |
| author_sort | Ciro Santus |
| collection | DOAJ |
| description | The bending configuration of shrink-fitted connection fretting fatigue tests causes a fluctuation in the contact pressure and in turn a more favourable condition for shear, rather than tensile, crack initiation. According to the classification type I (shear) and type II (tensile) fretting cracks, type II was only observed in the tests with no surface enhancement, which experienced the lowest fretting strength and thus a reduced pressure fluctuation effect. The crack initial direction was predicted as the critical plane orientation undergoing the maximum Fatemi-Socie (FS) stress parameter, for the shallow type I shear cracks. A significant result is that if the critical plane is searched at the fretting hot-spot, an incorrect outward direction is obtained, since the orthogonal direction, with the same shear stress amplitude, experiences a more compressive maximum normal stress. Conversely, with the application of the Point Method, taking the stress location at half the critical distance and by following the potential critical plane, a higher shear stress along the inward direction is obtained. The more compressive stress below the contact can therefore be compensated, and consequently the inward shallow direction is correctly predicted. |
| format | Article |
| id | doaj-art-d7afc70581924a96a7440f8630ff900f |
| 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-d7afc70581924a96a7440f8630ff900f2025-01-02T23:01:04ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932019-04-01134844245010.3221/IGF-ESIS.48.4210.3221/IGF-ESIS.48.42Initial orientation of the fretting fatigue cracks in shrink-fit connection specimensCiro SantusThe bending configuration of shrink-fitted connection fretting fatigue tests causes a fluctuation in the contact pressure and in turn a more favourable condition for shear, rather than tensile, crack initiation. According to the classification type I (shear) and type II (tensile) fretting cracks, type II was only observed in the tests with no surface enhancement, which experienced the lowest fretting strength and thus a reduced pressure fluctuation effect. The crack initial direction was predicted as the critical plane orientation undergoing the maximum Fatemi-Socie (FS) stress parameter, for the shallow type I shear cracks. A significant result is that if the critical plane is searched at the fretting hot-spot, an incorrect outward direction is obtained, since the orthogonal direction, with the same shear stress amplitude, experiences a more compressive maximum normal stress. Conversely, with the application of the Point Method, taking the stress location at half the critical distance and by following the potential critical plane, a higher shear stress along the inward direction is obtained. The more compressive stress below the contact can therefore be compensated, and consequently the inward shallow direction is correctly predicted.https://www.fracturae.com/index.php/fis/article/view/2288/2430Fretting FatigueInitial crack orientationMultiaxial fatigue criteriaSEM observations |
| spellingShingle | Ciro Santus Initial orientation of the fretting fatigue cracks in shrink-fit connection specimens Fracture and Structural Integrity Fretting Fatigue Initial crack orientation Multiaxial fatigue criteria SEM observations |
| title | Initial orientation of the fretting fatigue cracks in shrink-fit connection specimens |
| title_full | Initial orientation of the fretting fatigue cracks in shrink-fit connection specimens |
| title_fullStr | Initial orientation of the fretting fatigue cracks in shrink-fit connection specimens |
| title_full_unstemmed | Initial orientation of the fretting fatigue cracks in shrink-fit connection specimens |
| title_short | Initial orientation of the fretting fatigue cracks in shrink-fit connection specimens |
| title_sort | initial orientation of the fretting fatigue cracks in shrink fit connection specimens |
| topic | Fretting Fatigue Initial crack orientation Multiaxial fatigue criteria SEM observations |
| url | https://www.fracturae.com/index.php/fis/article/view/2288/2430 |
| work_keys_str_mv | AT cirosantus initialorientationofthefrettingfatiguecracksinshrinkfitconnectionspecimens |