|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Federation of European Materials Societies (FEMS) International Scholar Presentation: Finite Element Simulations of Short Fatigue Crack Propagation in Three Dimensional Microstructures Obtained by X-ray Tomography
||Henry Proudhon, Jia Li, Erembert Nizery, Jean-Yves Buffiere, Wolfgang Ludwig, Samuel Forest
|On-Site Speaker (Planned)
Combining in situ fatigue loading with absorption and diffraction contrast tomography, unique data sets can now be obtained to study the effect of the local microstructure on the very first stages of fatigue crack propagation. Crystal plasticity finite element simulations can now advantageously take experimetnal data as input to study the physical mechanisms at work.
Two situations will be presented. First, the initiation of fatigue cracks on second phase particles in a commercial Al-Cu-Li alloy via 3D finite element calculations are compared to experimental observations. A criterion to asses if the crack will grow crystallographically is proposed. Second, the growth of a short fatigue crack in a beta-titanium polycrystalline sample imaged by X-ray tomography is simulated. The model uses a damage indicator to assess the local crack growth rate and direction; remeshing routines are used to achieve propagation over several grains and the results are compared to the tomographic experiment.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)