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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Grilli, Nicolò
University of Bristol
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2024Modelling the Effect of Residual Stresses on Damage Accumulation Using a Coupled Crystal Plasticity Phase Field Fracture Approach
- 2024Effect of grain boundary misorientation and carbide precipitation on damage initiation:A coupled crystal plasticity and phase field damage studycitations
- 2024Effect of grain boundary misorientation and carbide precipitation on damage initiationcitations
- 2024Thermal Numerical Simulations of the Wire-Arc Additive Manufacturing (WAAM) Process
- 2023Crystal plasticity analysis of fatigue-creep behavior at cooling holes in single crystal Nickel based gas turbine blade componentscitations
- 2022Cold dwell behaviour of Ti6Al alloy:Understanding load shedding using digital image correlation and dislocation based crystal plasticity simulationscitations
- 2022Cold dwell behaviour of Ti6Al alloycitations
- 2021Modelling the nucleation and propagation of cracks at twin boundariescitations
- 2021An in-situ synchrotron diffraction study of stress relaxation in titanium:Effect of temperature and oxygen on cold dwell fatiguecitations
- 2020In situ measurement and modelling of the growth and length scale of twins in α -uraniumcitations
- 2020Characterisation of slip and twin activity using digital image correlation and crystal plasticity finite element simulation:Application to orthorhombic $α$-uraniumcitations
- 2020A phase field model for the growth and characteristic thickness of deformation-induced twinscitations
- 2019Crystal plasticity finite element simulations of cast α-uranium
- 2018Effect of initial damage variability on hot-spot nucleation in energetic materialscitations
- 2018Dynamic fracture and hot-spot modeling in energetic compositescitations
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document
Crystal plasticity finite element simulations of cast α-uranium
Abstract
α-uranium, the stable phase of uranium up to 670 ◦ C, has a base-centred orthorombic crystal structure. This crystal structure gives rise to elastic and thermal anisotropy, meaning α-uranium exhibits complex deformation and fracture behaviour. Understanding the relationship between the microstructure and mechanical properties is important to prevent fracture during manufacture and usage of components. The lattice of α-uranium corresponds to a distorted close-packed-hexagonal crystal structure and it exhibits twins of both the 1 st and 2 nd kind. Therefore, detailed examination of the behaviour of α-uranium can also contribute to the general understanding of the interaction between plasticity, twinning and fracture in hcp crystals. Plastic deformation in α-uranium can be accommodated by 4 slip systems and 3 twin systems, previously identified by McCabe et al. These deformation modes are implemented into a crystal plasticity finite element (CPFE) material model. A temperature dependent, dislocation density based law is implemented to describe the critical resolved shear stress on the different slip/twin systems. The strong anisotropic thermal expansion behaviour is taken into account to simulate the development of internal residual stresses following casting of the material. During cooling, the internal stresses in α-uranium are sufficient to induce plasticity. This effect is quantified using polycrystal simulations, in which first the temperature is decreased, then plastic relaxation takes place, followed by application of a mechanical load. The asymmetry between mechanical properties in tension and compression, due to the presence of twins, is investigated. The model is calibrated using stress strain curves and the lattice strain found from published neutron diffraction experiments carried out on textured samples at ISIS. The strength of the slip systems is found to be lower than in fine grained material, while the strength of the twin system is similar to single crystals. The CPFE method allows the ...