| 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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Katsamenis, Orestis L.
University of Southampton
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 20233D printing of personalised carvedilol tablets using selective laser sinteringcitations
- 2020Fabrication of an osmotic 3D printed solid dosage form for controlled release of active pharmaceutical ingredientscitations
- 2018Controlled release of 5-Fluorouracil from alginate beads encapsulated in 3D printed pH-responsive solid dosage formscitations
- 20173D printed oral solid dosage forms containing hydrochlorothiazide for controlled drug deliverycitations
- 2017Deformation mechanisms of idealised cermets under multi-axial loadingcitations
- 2017Characterization and mapping of rolling contact fatigue in rail-axle bearingscitations
- 20153-D analysis of fatigue crack behaviour in a shot peened steam turbine blade materialcitations
- 2014Nanomechanical assessment of human and murine collagen fibrils via atomic force microscopy cantilever-based nanoindentationcitations
- 2013A novel videography method for generating crack-extension resistance curves in small bone samplescitations
- 2012Mechanism of co-nanoprecipitation of organic actives and block copolymers in a microfluidic environmentcitations
- 2012Bone matrix material properties on the micro- and nanoscale
- 2010Preparation and characterization of bioceramics produced from calcium phosphate cementscitations
Places of action
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article
Deformation mechanisms of idealised cermets under multi-axial loading
Abstract
The response of idealised cermets comprising approximately 60% by volume steel spheres in a Sn/Pb solder matrix is investigated under a range of axisymmetric compressive stress states. Digital volume correlation (DVC) analysis of X-ray micro-computed tomography scans (μ-CT), and the measured macroscopic stress-strain curves of the specimens revealed two deformation mechanisms. At low triaxialities the deformation is granular in nature, with dilation occurring within shear bands. Under higher imposed hydrostatic pressures, the deformation mechanism transitions to a more homogeneous incompressible mode. However, DVC analyses revealed that under all triaxialities there are regions with local dilatory and compaction responses, with the magnitude of dilation and the number of zones wherein dilation occurs decreasing with increasing triaxiality. Two numerical models are presented in order to clarify these mechanisms: (i) a periodic unit cell model comprising nearly rigid spherical particles in a porous metal matrix and (ii) a discrete element model comprising a large random aggregate of spheres connected by non-linear normal and tangential “springs”. The periodic unit cell model captured the measured stress-strain response with reasonable accuracy but under-predicted the observed dilation at the lower triaxialities, because the kinematic constraints imposed by the skeleton of rigid particles were not accurately accounted for in this model. By contrast, the discrete element model captured the kinematics and predicted both the overall levels of dilation and the simultaneous presence of both local compaction and dilatory regions with the specimens. However, the levels of dilation in this model are dependent on the assumed contact law between the spheres. Moreover, since the matrix is not explicitly included in the analysis, this model cannot be used to predict the stress-strain responses. These analyses have revealed that the complete constitutive response of cermets depends both on the kinematic constraints imposed by ...