Fatigue crack growth behavior under multiaxial variable amplitude loading
This study compares both uniaxial and multiaxial variable amplitude experimental crack growth data for naturally initiated fatigue cracks in tubular specimens of 2024-T3 aluminum alloy to predictions based on two state-of-the-art analysis codes: UniGrow and FASTRAN. For variable amplitude fatigue...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2016-07-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero37/numero_37_art_23.pdf |
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| _version_ | 1841564197536661504 |
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| author | Nicholas R. Gates Ali Fatemi Nagaraja Iyyer Nam Phan |
| author_facet | Nicholas R. Gates Ali Fatemi Nagaraja Iyyer Nam Phan |
| author_sort | Nicholas R. Gates |
| collection | DOAJ |
| description | This study compares both uniaxial and multiaxial variable amplitude experimental crack growth
data for naturally initiated fatigue cracks in tubular specimens of 2024-T3 aluminum alloy to predictions based
on two state-of-the-art analysis codes: UniGrow and FASTRAN. For variable amplitude fatigue tests performed
under pure axial nominal loading conditions, both UniGrow and FASTRAN analyses were found to produce
mostly conservative growth life predictions, despite good agreement with constant amplitude crack growth data.
For variable amplitude torsion and combined axial-torsion crack growth analyses, however, the conservatism in
growth life predictions was found to reduce. This was attributed to multiaxial nominal stress state effects, such
as T-stress and mixed-mode crack growth, which are not accounted for in either UniGrow or FASTRAN, but
were found in constant amplitude fatigue tests to increase experimental crack growth rates. Since cracks in this
study were initiated naturally, different initial crack geometry assumptions were also investigated in the analyses. |
| format | Article |
| id | doaj-art-c3f47c44f2714dbe9fa1b6e5989f3091 |
| institution | Kabale University |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2016-07-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-c3f47c44f2714dbe9fa1b6e5989f30912025-01-02T23:01:46ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932016-07-01103716617210.3221/IGF-ESIS.37.23Fatigue crack growth behavior under multiaxial variable amplitude loadingNicholas R. Gates0Ali Fatemi1Nagaraja Iyyer2Nam Phan3The University of Toledo,USAThe University of Toledo,USATechnical Data Analysis, Inc. (TDA),USAUS Naval Air Systems Command,USAThis study compares both uniaxial and multiaxial variable amplitude experimental crack growth data for naturally initiated fatigue cracks in tubular specimens of 2024-T3 aluminum alloy to predictions based on two state-of-the-art analysis codes: UniGrow and FASTRAN. For variable amplitude fatigue tests performed under pure axial nominal loading conditions, both UniGrow and FASTRAN analyses were found to produce mostly conservative growth life predictions, despite good agreement with constant amplitude crack growth data. For variable amplitude torsion and combined axial-torsion crack growth analyses, however, the conservatism in growth life predictions was found to reduce. This was attributed to multiaxial nominal stress state effects, such as T-stress and mixed-mode crack growth, which are not accounted for in either UniGrow or FASTRAN, but were found in constant amplitude fatigue tests to increase experimental crack growth rates. Since cracks in this study were initiated naturally, different initial crack geometry assumptions were also investigated in the analyses.http://www.gruppofrattura.it/pdf/rivista/numero37/numero_37_art_23.pdfFatigue Crack GrowthMultiaxialVariable AmplitudeFASTRANUniGrow |
| spellingShingle | Nicholas R. Gates Ali Fatemi Nagaraja Iyyer Nam Phan Fatigue crack growth behavior under multiaxial variable amplitude loading Fracture and Structural Integrity Fatigue Crack Growth Multiaxial Variable Amplitude FASTRAN UniGrow |
| title | Fatigue crack growth behavior under multiaxial variable amplitude loading |
| title_full | Fatigue crack growth behavior under multiaxial variable amplitude loading |
| title_fullStr | Fatigue crack growth behavior under multiaxial variable amplitude loading |
| title_full_unstemmed | Fatigue crack growth behavior under multiaxial variable amplitude loading |
| title_short | Fatigue crack growth behavior under multiaxial variable amplitude loading |
| title_sort | fatigue crack growth behavior under multiaxial variable amplitude loading |
| topic | Fatigue Crack Growth Multiaxial Variable Amplitude FASTRAN UniGrow |
| url | http://www.gruppofrattura.it/pdf/rivista/numero37/numero_37_art_23.pdf |
| work_keys_str_mv | AT nicholasrgates fatiguecrackgrowthbehaviorundermultiaxialvariableamplitudeloading AT alifatemi fatiguecrackgrowthbehaviorundermultiaxialvariableamplitudeloading AT nagarajaiyyer fatiguecrackgrowthbehaviorundermultiaxialvariableamplitudeloading AT namphan fatiguecrackgrowthbehaviorundermultiaxialvariableamplitudeloading |