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 te...
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| Format: | Article |
| Language: | English |
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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/1734 |
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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-488e48c174784b24b5f88e0f195bce9c |
| 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-488e48c174784b24b5f88e0f195bce9c2024-12-02T05:42:35ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932016-06-011037Fatigue crack growth behavior under multiaxial variable amplitude loadingNicholas R. GatesAli FatemiNagaraja IyyerNam PhanThis 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 analyseshttps://www.fracturae.com/index.php/fis/article/view/1734Fatigue Crack GrowthMultiaxialVariable AmplitudeFASTRAN |
| 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 |
| 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 |
| url | https://www.fracturae.com/index.php/fis/article/view/1734 |
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