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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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Smith, Michael
École Polytechnique Fédérale de Lausanne
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (29/29 displayed)
- 2023Evolution and formation of dissimilar metal interface s in fusion weldingcitations
- 2022beamWeldFoam: Numerical Simulation of High Energy Density Fusion and Vapourisation-Inducing Processes
- 2022Transition from equatorial to whole-shell buckling in embedded spherical shells under axisymmetric far-field loadingcitations
- 2022A fundamental analysis of factors affecting chemical homogeneity in the laser powder bed fusion process
- 2021Geometrical and Mechanical Characterisation of Hollow Thermoplastic Microspheres for Syntactic Foam Applicationscitations
- 2021Mapping flow evolution in gas tungsten arc weld pools
- 2021Development of microstructure and residual stresses in electron beam welds in low alloy pressure vessel steels
- 2021Magneto-hydrodynamics of multi-phase flows in heterogeneous systems with large property gradients:Multi-Component multi-phase magnetohydrodynamicscitations
- 2020Impact of weld restraint on the development of distortion and stress during the electron beam welding of a low-alloy steel subject to solid state phase transformation
- 2020Unprecedented Dipole Alignment in α-phase Nylon-11 Nanowires for High Performance Energy Harvesting Applications
- 2020Unprecedented dipole alignment in α-phase nylon-11 nanowires for high-performance energy-harvesting applicationscitations
- 2019Residual stresses in arc and electron-beam welds in 130 mm thick SA508 steel:Part 2 –measurementscitations
- 2019Validated prediction of weld residual stresses in austenitic steel pipe girth welds before and after thermal ageing, part 2: Modelling and validationcitations
- 2019Residual stresses in arc and electron-beam welds in 130 mm thick SA508 steel:Part 1 - Manufacturecitations
- 2019Validated prediction of weld residual stresses in austenitic steel pipe girth welds before and after thermal ageing, part 1: Mock-up manufacture, residual stress measurements, and materials characterisationcitations
- 2019Measurement and Prediction of Phase Transformation Kinetics in a Nuclear Steel During Rapid Thermal Cyclescitations
- 2018Prediction of grain boundary evolution in an titanium alloy substrate using a novel phase field model coupled with a semi-analytical thermal solution
- 2018Residual Stress Distributions in Arc, Laser and Electron-Beam Welds in 30 mm Thick SA508 Steel:A Cross-Process Comparisoncitations
- 2017Mapping piezoelectric response in nanomaterials using a dedicated non-destructive scanning probe technique
- 2017Residual stress measurement round robin on an electron beam welded joint between austenitic stainless steel 316L(N) and ferritic steel P91citations
- 2014Prediction and measurement of weld residual stresses in thermally aged girth-welded austenitic steel pipes
- 2014Optimising residual stress measurements and predictions in a welded benchmark specimen: a review of Phase two of the NeT Task Group 1 single bead on p
- 2014Full field measurement of plastic flow properties in a multi-pass austenitic stainless steel weld specimen
- 2014Numerical validation of a strain-based failure assessment diagram approach to fracture
- 2014The impact of key simulation variables on predicted residual stresses in pressuriser nozzle dissimilar metal weld mock-ups
- 2014analysis of residual stresses in three-pass slot weld (NeT TG4): finite element modelling and neutron diffraction
- 2012Comprehensive numerical analysis of a three-pass bead-in-slot weld and its critical validation using neutron and synchrotron diffraction residual stress measurements, International Journal of Solids a
- 2009NeT bead on plate round robin: Comparison of transient thermal predictions and measurements
- 2007Interaction of residual stress with mechanical loading in a ferritic steelcitations
Places of action
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article
Transition from equatorial to whole-shell buckling in embedded spherical shells under axisymmetric far-field loading
Abstract
Motivated by the need to understand the compression of syntactic foam composites, we solve the canonical problem of buckling of a thin spherical shell embedded in a medium that is much softer than the shell. Syntactic foams comprise shells that usually have diameters in the micron range and are distributed inside a matrix medium that is typically polymeric. Such foams are commonly employed in a range of applications where high stiffness to density ratios are of interest. This can be tailored via choice of shell thickness and type, and filler volume fraction.<br/><br/>Embedded glass microspheres fracture under sufficiently high loading, leading to a permanent softening of the syntactic foam. Embedded polymeric Expancel microspheres however are thought to buckle because the associated softening of the foam is recoverable. We determine critical buckling pressures in the practical scenarios of hydrostatic and uniaxial compressive loading states by solving a more general uniaxial loading problem. Critically, we investigate the thin-stiff shell limit, which yields very different results from a standard thin-shell limit under the assumption that the shell and matrix have stiffnesses of the same order. We employ nonlinear shell theory, linear stability analysis and rigorous asymptotics. We present numerical results for the critical buckling pressure over a wide range of shell thickness and contrasts in shell/matrix stiffnesses. Results for hydrostatic loading are compared against existing analytical and semi-analytical models for embedded shells. Under uniaxial loading we note that there are two distinct regions of parameter space, corresponding to equatorial and non-equatorial buckling regimes. The two non-dimensional parameters of critical importance are the shell thickness to radius ratio h/R and the shell to matrix shear modulus ratio µ<sub>m</sub>/µ<sub>s</sub>. By fixing one whilst varying the other we observe and describe the transition between these two regimes.