Kinetics of fatigue crack growth and crack closure effect in long term operating steel manufactured at the turn of the 19 th and 20 th centuries
| Autor: | Filippo Berto, José A.F.O. Correia, A.M.P. De Jesus, Grzegorz Lesiuk, M. Szata |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
business.industry Mechanical Engineering Kinetics 020101 civil engineering 02 engineering and technology Structural engineering Paris' law Crack growth resistance curve 0201 civil engineering Crack closure 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Fracture (geology) General Materials Science Deformation (engineering) business Beam (structure) Stress concentration |
| Zdroj: | Engineering Fracture Mechanics. 185:160-174 |
| ISSN: | 0013-7944 |
| DOI: | 10.1016/j.engfracmech.2017.04.044 |
| Popis: | In this paper the fatigue crack growth behaviour in structural components from the old 19th century structures (e.g. bridges) has been investigated. The delivered material for investigation was extracted from a beam made of puddled iron, commonly used in the 19th century. The obtained results from several ancient railway metallic bridges (located in Lower Silesia, Poland) have shown the presence of microstructural degradation processes in puddled iron. The kinetic fatigue fracture diagrams (KFFD) have been obtained for post-operated steel. The problem of crack closure has been involved in fatigue crack growth process during the experiments and its understanding is fundamental for the analysis of stress ratio effects on KFFD. An experimental and numerical approach has been considered for the evaluation of the crack closure/opening forces based on the hysteresis loop deformation. The implemented algorithm in the numerical environment gives promising results in the description of the kinetics of fatigue crack growth of the old metallic materials with consideration of crack closure effects. The problem of fatigue crack growth rate description from the energy point of view has been presented and discussed. The Universal Graph method (based on Dimensional Analysis approach) was used for phenomenological formulation of the kinetic equation. |
| Databáze: | OpenAIRE |
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