Local strain energy density to assess the multiaxial fatigue strength of titanium alloys
The present paper investigates the multiaxial fatigue strength of sharp V-notched components made of titanium grade 5 alloy (Ti-6Al-4V). Axisymmetric notched specimens have been tested under combined tension and torsion fatigue loadings, both proportional and non-proportional, taking into account di...
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Gruppo Italiano Frattura
2016-06-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/1720 |
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| author | Filippo Berto Alberto Campagnolo Torgeir Welo |
| author_facet | Filippo Berto Alberto Campagnolo Torgeir Welo |
| author_sort | Filippo Berto |
| collection | DOAJ |
| description | The present paper investigates the multiaxial fatigue strength of sharp V-notched components made of titanium grade 5 alloy (Ti-6Al-4V). Axisymmetric notched specimens have been tested under combined tension and torsion fatigue loadings, both proportional and non-proportional, taking into account different nominal load ratios (R = -1 and 0). All tested samples have a notch root radius about equal to 0.1 mm, a notch depth of 6 mm and an opening angle of 90 degrees. The fatigue results obtained by applying multiaxial loadings are discussed together with those related to pure tension and pure torsion experimental fatigue tests, carried out on both smooth and notched specimens at load ratios R ranging between -3 and 0.5. Altogether, more than 250 fatigue results (19 S-N curves) are examined, first on the basis of nominal stress amplitudes referred to the net area and secondly by means of the strain energy density averaged over a control volume embracing the V-notch tip. The effect of the loading mode on the control volume size has been analysed, highlighting a wide difference in the notch sensitivity of the considered material under tension and torsion loadings. Accordingly, the control radius of the considered titanium alloy (Ti-6Al-4V) is found to be strongly affected by the loading mode. |
| format | Article |
| id | doaj-art-3d0ebad2b71b48dd8fd2f12e6d37c70c |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2016-06-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-3d0ebad2b71b48dd8fd2f12e6d37c70c2025-01-02T23:01:28ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932016-06-011037Local strain energy density to assess the multiaxial fatigue strength of titanium alloysFilippo Berto0Alberto Campagnolo1Torgeir Welo2University of PadovaUniversity of PadovaNTNUThe present paper investigates the multiaxial fatigue strength of sharp V-notched components made of titanium grade 5 alloy (Ti-6Al-4V). Axisymmetric notched specimens have been tested under combined tension and torsion fatigue loadings, both proportional and non-proportional, taking into account different nominal load ratios (R = -1 and 0). All tested samples have a notch root radius about equal to 0.1 mm, a notch depth of 6 mm and an opening angle of 90 degrees. The fatigue results obtained by applying multiaxial loadings are discussed together with those related to pure tension and pure torsion experimental fatigue tests, carried out on both smooth and notched specimens at load ratios R ranging between -3 and 0.5. Altogether, more than 250 fatigue results (19 S-N curves) are examined, first on the basis of nominal stress amplitudes referred to the net area and secondly by means of the strain energy density averaged over a control volume embracing the V-notch tip. The effect of the loading mode on the control volume size has been analysed, highlighting a wide difference in the notch sensitivity of the considered material under tension and torsion loadings. Accordingly, the control radius of the considered titanium alloy (Ti-6Al-4V) is found to be strongly affected by the loading mode.https://www.fracturae.com/index.php/fis/article/view/1720Ti-6Al-4VMultiaxial fatigueV-notchControl volumeStrain Energy Density |
| spellingShingle | Filippo Berto Alberto Campagnolo Torgeir Welo Local strain energy density to assess the multiaxial fatigue strength of titanium alloys Fracture and Structural Integrity Ti-6Al-4V Multiaxial fatigue V-notch Control volume Strain Energy Density |
| title | Local strain energy density to assess the multiaxial fatigue strength of titanium alloys |
| title_full | Local strain energy density to assess the multiaxial fatigue strength of titanium alloys |
| title_fullStr | Local strain energy density to assess the multiaxial fatigue strength of titanium alloys |
| title_full_unstemmed | Local strain energy density to assess the multiaxial fatigue strength of titanium alloys |
| title_short | Local strain energy density to assess the multiaxial fatigue strength of titanium alloys |
| title_sort | local strain energy density to assess the multiaxial fatigue strength of titanium alloys |
| topic | Ti-6Al-4V Multiaxial fatigue V-notch Control volume Strain Energy Density |
| url | https://www.fracturae.com/index.php/fis/article/view/1720 |
| work_keys_str_mv | AT filippoberto localstrainenergydensitytoassessthemultiaxialfatiguestrengthoftitaniumalloys AT albertocampagnolo localstrainenergydensitytoassessthemultiaxialfatiguestrengthoftitaniumalloys AT torgeirwelo localstrainenergydensitytoassessthemultiaxialfatiguestrengthoftitaniumalloys |