Multiaxial fatigue life response depending on proportionality grade between normal and shear strains/stresses and material ductility
| Autor: | Cetin Morris Sonsino |
|---|---|
| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
chemistry.chemical_element Sintering 02 engineering and technology Welding ducility Industrial and Manufacturing Engineering law.invention 0203 mechanical engineering Aluminium law Shear stress General Materials Science multiaxial fatigue steel Composite material Tensile testing Manufacturing technology Mechanical Engineering aluminium proportional loading 021001 nanoscience & nanotechnology 020303 mechanical engineering & transports Shear (geology) chemistry Mechanics of Materials Modeling and Simulation Elongation 0210 nano-technology |
| Popis: | Current experiences show that a non-proportional loading of ductile materials such as wrought steels, wrought aluminium or wrought magnesium alloys, not welded or welded, causes a significant fatigue life reduction under an out-of-phase shear strain or shear stress superimposed on a normal strain or normal stress compared with proportional in-phase loading. But when ductility, here characterised by tensile elongation, is reduced by a heat treatment or by another manufacturing technology such as casting or sintering, the afore-mentioned life reduction is compensated or even inversed, i.e. longer fatigue life results compared with proportional loading. However, some materials reveal even despite good elongation values a neutral behaviour or a prolongation of life. Responsible for these observations are not only the overall material ductilities or matrix-ductilities, but also the interaction between matrix and microstructural features such as manufacturing-dependent nodules, pores, internal defects like microporosities. They cause by local constraints a hindrance of deformations despite good overall ductilities. This complex life behaviour under non-proportional loading cannot always be estimated. Therefore, not only in strength hypotheses, but also in experimental proofs of multiaxial loaded parts, especially safety-critical components or structures, with real or service-like signals, emphasis must be placed on retaining non-proportionalities between loads and stresses/strains, respectively. |
| Databáze: | OpenAIRE |
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