A comparison between S-N Logistic and Kohout-Vechet formulations applied to the fatigue data of old metallic bridges materials
A new formulation of a Logistic deterministic S-N curve is applied to fatigue data of metallic materials from ancient Portuguese riveted steel bridges. This formulation is based on a modified logistic relation that uses three parameters to fit the low-cycle- (LCF), finite-life- and high-cycle-fatigu...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2019-04-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/2229/2422 |
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| author | Joelton Fonseca Barbosa Jos� A.F.O. Correia Pedro A. Montenegro Raimundo Carlos Silverio Freire J�nior Grzegorz Lesiuk Ab�lio M.P. De Jesus Rui A.B. Cal�ada |
| author_facet | Joelton Fonseca Barbosa Jos� A.F.O. Correia Pedro A. Montenegro Raimundo Carlos Silverio Freire J�nior Grzegorz Lesiuk Ab�lio M.P. De Jesus Rui A.B. Cal�ada |
| author_sort | Joelton Fonseca Barbosa |
| collection | DOAJ |
| description | A new formulation of a Logistic deterministic S-N curve is applied to fatigue data of metallic materials from ancient Portuguese riveted steel bridges. This formulation is based on a modified logistic relation that uses three parameters to fit the low-cycle- (LCF), finite-life- and high-cycle-fatigue (HCF) regions. This model is compared to the Kohout-Vechet fatigue model, which has a refined adjustment from very low-cycle fatigue (VLCF) to very high-cycle fatigue (VHCF). These models are also compared with other models, such as, power law and fatigue-life curve from the ASTM E739 standard. The modelling performance of the S-N curves was made using the fatigue data considering the stress fatigue damage parameter for the materials from the Eiffel, Luiz I, F�o and Trez�i riveted steel bridges. Using a qualitative methodology of graphical adjustment analysis and another quantitative using the mean square error, it was possible to evaluate the performance of the mean S-N curve formulation. The results showed that the formulation of the S-N curve using the Logistic equation applied to the metallic materials from the old bridges resulted in a superior performance when compared with others models under consideration, both in the estimation of fatigue behaviour in the low-cycle fatigue (LCF) region and in the lowest mean square error. |
| format | Article |
| id | doaj-art-1925ac270be743ceb1ca995b1cdf724b |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2019-04-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-1925ac270be743ceb1ca995b1cdf724b2025-01-02T20:55:40ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932019-04-01134840041010.3221/IGF-ESIS.48.3810.3221/IGF-ESIS.48.38A comparison between S-N Logistic and Kohout-Vechet formulations applied to the fatigue data of old metallic bridges materialsJoelton Fonseca BarbosaJos� A.F.O. CorreiaPedro A. MontenegroRaimundo Carlos Silverio Freire J�niorGrzegorz LesiukAb�lio M.P. De JesusRui A.B. Cal�adaA new formulation of a Logistic deterministic S-N curve is applied to fatigue data of metallic materials from ancient Portuguese riveted steel bridges. This formulation is based on a modified logistic relation that uses three parameters to fit the low-cycle- (LCF), finite-life- and high-cycle-fatigue (HCF) regions. This model is compared to the Kohout-Vechet fatigue model, which has a refined adjustment from very low-cycle fatigue (VLCF) to very high-cycle fatigue (VHCF). These models are also compared with other models, such as, power law and fatigue-life curve from the ASTM E739 standard. The modelling performance of the S-N curves was made using the fatigue data considering the stress fatigue damage parameter for the materials from the Eiffel, Luiz I, F�o and Trez�i riveted steel bridges. Using a qualitative methodology of graphical adjustment analysis and another quantitative using the mean square error, it was possible to evaluate the performance of the mean S-N curve formulation. The results showed that the formulation of the S-N curve using the Logistic equation applied to the metallic materials from the old bridges resulted in a superior performance when compared with others models under consideration, both in the estimation of fatigue behaviour in the low-cycle fatigue (LCF) region and in the lowest mean square error.https://www.fracturae.com/index.php/fis/article/view/2229/2422FatigueKohout-Vechet modelFatigue-life curvePredictionLogistic formulation |
| spellingShingle | Joelton Fonseca Barbosa Jos� A.F.O. Correia Pedro A. Montenegro Raimundo Carlos Silverio Freire J�nior Grzegorz Lesiuk Ab�lio M.P. De Jesus Rui A.B. Cal�ada A comparison between S-N Logistic and Kohout-Vechet formulations applied to the fatigue data of old metallic bridges materials Fracture and Structural Integrity Fatigue Kohout-Vechet model Fatigue-life curve Prediction Logistic formulation |
| title | A comparison between S-N Logistic and Kohout-Vechet formulations applied to the fatigue data of old metallic bridges materials |
| title_full | A comparison between S-N Logistic and Kohout-Vechet formulations applied to the fatigue data of old metallic bridges materials |
| title_fullStr | A comparison between S-N Logistic and Kohout-Vechet formulations applied to the fatigue data of old metallic bridges materials |
| title_full_unstemmed | A comparison between S-N Logistic and Kohout-Vechet formulations applied to the fatigue data of old metallic bridges materials |
| title_short | A comparison between S-N Logistic and Kohout-Vechet formulations applied to the fatigue data of old metallic bridges materials |
| title_sort | comparison between s n logistic and kohout vechet formulations applied to the fatigue data of old metallic bridges materials |
| topic | Fatigue Kohout-Vechet model Fatigue-life curve Prediction Logistic formulation |
| url | https://www.fracturae.com/index.php/fis/article/view/2229/2422 |
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