Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach
The fatigue behaviour of circumferentially notched specimens made of titanium alloy, Ti-6Al-4V, has been analysed. To investigate the notch effect on the fatigue strength, pure bending, pure torsion and multiaxial bending-torsion fatigue tests have been carried out on specimens characterized by two...
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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_2.pdf |
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| author | Giovanni Meneghetti Alberto Campagnolo Filippo Berto Keisuke Tanaka |
| author_facet | Giovanni Meneghetti Alberto Campagnolo Filippo Berto Keisuke Tanaka |
| author_sort | Giovanni Meneghetti |
| collection | DOAJ |
| description | The fatigue behaviour of circumferentially notched specimens made of titanium alloy, Ti-6Al-4V, has been analysed. To investigate the notch effect on the fatigue strength, pure bending, pure torsion and multiaxial bending-torsion fatigue tests have been carried out on specimens characterized by two different root radii, namely 0.1 and 4 mm. Crack nucleation and subsequent propagation have been accurately monitored by using the direct current potential drop (DCPD) technique. Based on the results obtained from the potential drop technique, the crack initiation life has been defined in correspondence of a relative potential drop increase V/V0 equal to 1%, and it has been used as failure criterion. Doing so, the effect of extrinsic mechanisms operating during crack propagation phase, such as sliding contact, friction and meshing between fracture surfaces, is expected to be reduced. The experimental fatigue test results have been re-analysed by using the local strain energy density (SED) averaged over a structural volume having radius R0 and surrounding the notch tip. Finally, the use of the local strain energy density parameter allowed us to properly correlate the crack initiation life of Ti-6Al-4V notched specimens, despite the different notch geometries and loading conditions involved in the tests |
| format | Article |
| id | doaj-art-dd1058b6eda34dfca1a5beed14c2b63d |
| institution | Kabale University |
| 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-dd1058b6eda34dfca1a5beed14c2b63d2025-02-03T10:38:22ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932017-07-01114181510.3221/IGF-ESIS.41.02 Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approachGiovanni Meneghetti0 Alberto Campagnolo 1 Filippo Berto 2Keisuke Tanaka 3University of Padova, ItalyUniversity of Padova, ItalyUniversity of Padova, ItalyMeijo University, ChinaThe fatigue behaviour of circumferentially notched specimens made of titanium alloy, Ti-6Al-4V, has been analysed. To investigate the notch effect on the fatigue strength, pure bending, pure torsion and multiaxial bending-torsion fatigue tests have been carried out on specimens characterized by two different root radii, namely 0.1 and 4 mm. Crack nucleation and subsequent propagation have been accurately monitored by using the direct current potential drop (DCPD) technique. Based on the results obtained from the potential drop technique, the crack initiation life has been defined in correspondence of a relative potential drop increase V/V0 equal to 1%, and it has been used as failure criterion. Doing so, the effect of extrinsic mechanisms operating during crack propagation phase, such as sliding contact, friction and meshing between fracture surfaces, is expected to be reduced. The experimental fatigue test results have been re-analysed by using the local strain energy density (SED) averaged over a structural volume having radius R0 and surrounding the notch tip. Finally, the use of the local strain energy density parameter allowed us to properly correlate the crack initiation life of Ti-6Al-4V notched specimens, despite the different notch geometries and loading conditions involved in the testshttp://www.gruppofrattura.it/pdf/rivista/numero41/numero_41_art_2.pdfTitanium alloyFatigue notch effectPotential drop methodCrack initiationAveraged SED |
| spellingShingle | Giovanni Meneghetti Alberto Campagnolo Filippo Berto Keisuke Tanaka Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach Fracture and Structural Integrity Titanium alloy Fatigue notch effect Potential drop method Crack initiation Averaged SED |
| title | Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach |
| title_full | Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach |
| title_fullStr | Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach |
| title_full_unstemmed | Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach |
| title_short | Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach |
| title_sort | crack initiation life in notched ti 6al 4v titanium bars under uniaxial and multiaxial fatigue synthesis based on the averaged strain energy density approach |
| topic | Titanium alloy Fatigue notch effect Potential drop method Crack initiation Averaged SED |
| url | http://www.gruppofrattura.it/pdf/rivista/numero41/numero_41_art_2.pdf |
| work_keys_str_mv | AT giovannimeneghetti crackinitiationlifeinnotchedti6al4vtitaniumbarsunderuniaxialandmultiaxialfatiguesynthesisbasedontheaveragedstrainenergydensityapproach AT albertocampagnolo crackinitiationlifeinnotchedti6al4vtitaniumbarsunderuniaxialandmultiaxialfatiguesynthesisbasedontheaveragedstrainenergydensityapproach AT filippoberto crackinitiationlifeinnotchedti6al4vtitaniumbarsunderuniaxialandmultiaxialfatiguesynthesisbasedontheaveragedstrainenergydensityapproach AT keisuketanaka crackinitiationlifeinnotchedti6al4vtitaniumbarsunderuniaxialandmultiaxialfatiguesynthesisbasedontheaveragedstrainenergydensityapproach |