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
2017-07-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero41/numero_41_art_12.pdf |
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| author | Filippo Berto Alberto Campagnolo Torgeir Welo Sabrina Vantadori Andrea Carpinteri |
| author_facet | Filippo Berto Alberto Campagnolo Torgeir Welo Sabrina Vantadori Andrea Carpinteri |
| 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-b247b795c3ab40e9abb380cb7be227ed |
| institution | DOAJ |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2017-07-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-b247b795c3ab40e9abb380cb7be227ed2025-08-20T02:43:05ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932017-07-011141798910.3221/IGF-ESIS.41.12 Multiaxial fatigue strength of titanium alloysFilippo Berto0Alberto Campagnolo1Torgeir Welo 2Sabrina Vantadori3Andrea Carpinteri 4University of Padova, ItalyUniversity of Padova, Italy Department of Mechanical and Industrial Engineering, Trondheim, Norway University of Padova, ItalyUniversity of Padova, ItalyThe 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.http://www.gruppofrattura.it/pdf/rivista/numero41/numero_41_art_12.pdfTi-6Al-4VMultiaxial fatigueV-notchControl volumeStrain Energy Density |
| spellingShingle | Filippo Berto Alberto Campagnolo Torgeir Welo Sabrina Vantadori Andrea Carpinteri Multiaxial fatigue strength of titanium alloys Fracture and Structural Integrity Ti-6Al-4V Multiaxial fatigue V-notch Control volume Strain Energy Density |
| title | Multiaxial fatigue strength of titanium alloys |
| title_full | Multiaxial fatigue strength of titanium alloys |
| title_fullStr | Multiaxial fatigue strength of titanium alloys |
| title_full_unstemmed | Multiaxial fatigue strength of titanium alloys |
| title_short | Multiaxial fatigue strength of titanium alloys |
| title_sort | multiaxial fatigue strength of titanium alloys |
| topic | Ti-6Al-4V Multiaxial fatigue V-notch Control volume Strain Energy Density |
| url | http://www.gruppofrattura.it/pdf/rivista/numero41/numero_41_art_12.pdf |
| work_keys_str_mv | AT filippoberto multiaxialfatiguestrengthoftitaniumalloys AT albertocampagnolo multiaxialfatiguestrengthoftitaniumalloys AT torgeirwelo multiaxialfatiguestrengthoftitaniumalloys AT sabrinavantadori multiaxialfatiguestrengthoftitaniumalloys AT andreacarpinteri multiaxialfatiguestrengthoftitaniumalloys |