| People | Locations | Statistics |
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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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| Kononenko, Denys |
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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
Places of action
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article
Cold dwell behaviour of Ti6Al alloy
Abstract
<p>Digital image correlation (DIC) and dislocation based crystal plasticity simulation were utilised to study cold dwell behaviour in a coarse grain Ti-6Al alloy at 3 different temperatures up to 230 °C. Strains extracted from large volume grains were measured during creep by DIC and were used to calibrate the crystal plasticity model. The values of critical resolved shear stresses (CRSS) of the two main slip systems (basal and prismatic) were determined as a function of temperature. Stress along paths across the boundaries of four grain pairs, three “rogue” grain pairs and one “non-rogue” grain pair, were determined at different temperatures. Large load shedding was observed in one of the “rogue” grain pairs, where a stress increment during the creep period was found in the “hard” grain. A minor load shedding mechanism was observed in two non-typical “rogue” grain pairs, in which the plastic deformation is nonuniform inside the grains and geometrically necessary dislocations accumulate in the centre of the grains. At elevated temperatures, 120 °C was found to be the worst case scenario as the stress difference at the grain boundaries of these four grain pairs was found to be the largest among the three temperatures analysed. The origin of this critical temperature is debated in the literature and it is investigated for the first time in the present work by analysing the simultaneous effects of the geometrically necessary dislocations (GND) and the strain rate sensitivity (SRS) of the slip systems. The analysis shows that the combined effects of the peak SRS of both prismatic and basal slip systems at 80 °C and of the increase of the spread of the GND distribution around the grain boundary at higher temperatures are the origin of the observed worst case scenario.</p>