Fatigue crack nucleation at grain boundaries – experiment and simulation
-
Horst Vehoff
und
Andrii Nykyforchyn
Abstract
Fatigue crack nucleation at grain boundaries near the endurance limit was examined combining the results of the fatigue tests with local orientation measurements and with finite element (FE) calculations. Bicrystals and coarsegrained thin sheets were examined in which the orientation and inclination of each boundary could be measured directly. These results were used as input for the FE calculation in which the stress concentrations near the boundaries were calculated. In the fatigue tests, the boundaries, at which the first cracks nucleate, where measured by a replica technique. A comparison of the experimental results with the predictions of the FE calculation yields that the cracks nucleated and propagated along the boundaries with the largest stress concentration. Cracks which hit a boundary with a lower stress concentration either stop or propagate transgranularly, depending on the local stress concentration given by the microstructure. From these results, it can be concluded that elastic strain incompatibilities combined with the microstructure (grain size and orientation) can be used to predict the crack nucleation sites and the scatter in lifetime for fatigue near the endurance limit.
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© 2003 Carl Hanser Verlag, München
Artikel in diesem Heft
- Frontmatter
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- Notifications/Mitteilungen
- Personal/Personelles
- Books/Bücher
- Conferences/Konferenzen
Artikel in diesem Heft
- Frontmatter
- Articles/Aufsätze
- Bedeutung von Eigenspannungsabbau und mikrostrukturellen Veränderungen für die Lebensdauervorhersage schwingbeanspruchter Schweißverbindungen
- Factors affecting cyclic lifetime of EB-PVD thermal barrier coatings with various bond coats
- Depth-resolved X-ray residual stress analysis in PVD (Ti, Cr) N hard coatings
- Crystal orientation and residual stress in TiN film by synchrotron radiation
- Characterization of thermal and anodic oxide layers on β- and on near-β-titanium alloys for biomedical application
- Micromechanisms and modelling of crack initiation and growth in tool steels: role of primary carbides
- Fatigue crack nucleation at grain boundaries – experiment and simulation
- Fatigue and fracture-induced defect structures of metals investigated by positron microscopy
- Deformation and fracture of Nb/α-Al2O3 composites in compression and bending studied by optical methods
- Dislocation microstructures of single crystal ⟨001⟩ CMSX-4 specimens tensile tested at 700 and 1000°C
- Influence of mechanical surface treatments on the HCF performance of the Ni-superalloy Udimet 720 LI
- Precipitation of β-phase and twinning during deformation of Mg–Al alloy AZ91 at 150 °C after solution treatment
- Nanograin size, high-nitrogen austenitic stainless steels
- Der dynamische SD-Effekt und der Einfluss auf die Fließortkurve
- Einfluss der Umformgeschwindigkeit und -temperatur auf das Fließverhalten metallischer Werkstoffe
- Mean stress sensitivity of sintered iron and steel
- Thermozyklisches Kriechen einer kurzfaserverstärkten Aluminium-Kolbenlegierung
- Strength and ductility of thin Cu wires
- Modeling of deformation behavior of copper under equal channel angular pressing
- Reaktionssintern von AlMg–MgO zur Herstellung von Bauteilen auf Spinellbasis
- Determination of the local oxygen distribution in a commercial titanium alloy by 3-dimensional atom probe
- Phase diagram of the Al–Cu–Fe quasicrystal-forming alloy system
- Notifications/Mitteilungen
- Personal/Personelles
- Books/Bücher
- Conferences/Konferenzen
