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Mounting bracket

Mechanical analysis of an aluminium mounting bracket

This numerical simulation investigates the deformation and the equivalent stress in a metallic (aluminium) mounting bracket. The structure is subject to the combined action of torsion, point load and dead load.
The analysis shows an accumulation of the equivalent stress in the bottorm arms, which stays however well below the aluminium yield strength.
The FE mesh was generated through optimized automatic tetrahedralization of the geometrical model.

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Composite slab exposed to fire

Thermo-mechanical analysis of a steel-reinforced concrete slab at high-temperature

This numerical simulation shows a composite slab at high temperature exhibiting thermoplastic behaviour. The analysis is carried out by coupling thermal and mechanical FE analysis. The temperature field in the slab is computed by running a transient thermal analysis, where a thermal load according to the fire curve ISO 834 is applied. The heat strongly affects the mechanical properties of concrete and steel, reducing their elastic modulus and yield strength. As a result, the slab deflection increases with the temperature, as expected during fire exposure. The concrete behaviour is simulated with a Double Drucker-Prager constitutive model, which takes into account the material fracture energy. The steel beams are modeled according to Von Mises Yield criterion.

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Heat transfer analysis of a piston

A Piston subject to thermal load and convection

This transient thermal analysis shows the temperature distribution in an aluminium piston. At the top of the device a fixed temperature is applied, while the external surface is subject to convective heat flux. Observing a piston cross-section, it is easy to notice the influence of the geometry on the heat transfer.

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Buckling analysis of a steel beam

Detection of multiple instability modes in a 3D structure

This Finite Element Analysis shows the development of buckling in a HEA 500 steel beam. The buckling analysis takes into account geometric nonlinearity (large deformations) according to the formulation of Simo J.C. and Miehe C. The material nonlinearity of steel after yielding (elastoplasticity) is simulated by taking into account the Von Mises constitutive model with isotropic linear hardening. In particular, it is possible to detect several instability modes developing at different critical loads.

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Geomechanical Tunnel Design by Convergence-Confinement Method

3D Nonlinear Simulation of Escavation and Lining Installation

This simulation shows a tridimensional application of the Convergence-Confinement Method for geomechanical tunnel design. In this study, the in-situ stresses are calculated first, by modelling the nonlinear geomechanical properties of soil with the well-known Mohr-Coulomb criterion.
Taking into account this initial stress distribution, the tunnel excavation is simulated. Before the installation of the tunnel lining, a so-called relaxation coefficient equal to 30% is considered. After the installation of the tunnel structure, the soil confinement is completely removed and additional loads such as water pressure are applied. With this procedure, the observed soil relaxation in the period of time between the tunnel excavation and the lining installation can take place.
The computed internal forces in the tunnel structure, which is modelled with shell elements, allow the calculation of the necessary steel reinforcement according to the main civil engineering standards such as Eurocode. The particular geometrical shape of the considered tunnel section, where an emergency exit is present, yields asymmetrical results.
This study focuses only on the steel reinforcement resulting from the Ultimate Limit States calculation, while the required reinforcement for limitation of concrete cracks width and minimum amount of bonded reinforcement are not shown.

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