AVALLE , Massimiliano

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The axisymmetric collapse by plastic progressive folding of a circular tube submitted to axial loading is considered by an experimental approach. The strain field history is measured by means of electric strain gages properly placed on the external surface of the tube so that more than one fold is covered and both axial and circumferential...

A tapered tubular steel component to be used as an energy-absorbing device has been optimised by taking into account two design variables describing the tapering geometry. The minimisation of a load uniformity parameter evaluated as the ratio between the maximum and the average crushing loads has been considered as objective function. The...

The present work reports of a series of experimental tests with two polymeric materials, a thermoplastic polyurethane (TPU) and a polyamide (PA), modified with the inclusion of additives, in terms of their tribological properties of friction and wear. Many thermoplastic materials are in fact used in applications with sliding contact and...

The present work is aimed at reporting the methodology used to develop an innovative type of heat exchanger to exploit the free space under the upper skin of a car bonnet between the stiffener ribs. The idea is to take advantage of the large surface of the bonnet itself as a radiating area to increase the heat exchange capacity of the cooling...

The aim of this work is to identify the tensile strength of alumina (Corbit98), by performing Brazilian tests at different loading rate. In this kind of test, generally used for brittle material in static loading conditions, a cylindrical specimen is diametrically compressed and failure is generated in the middle of the component as a...

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Fused filament fabrication (FFF, also known as fused deposition modeling) is the most popular 3D printing additive manufacturing technology: cheap 3D printers are largely widespread and most polymeric materials can be used. It is probably the most versatile additive manufacturing technology. The applications range from prototyping to the...

In the work, polyurethane rigid foam for energy absorption in automotive applications has been considered. Polyurethane foams are very interesting in these applications because of the possibility to foam them in place filling the required volume space. The material behaviour has been studied by subjecting the foam to different stress state...

The design of vehicle front structures for crashworthiness is nowadays commonly based on a series of rigid subsystems that constitute a nearly undeformable survival cell for the passengers, and deformable subsystems able to efficiently dissipate the vehicle kinetic energy. During frontal crash, which is by far the most dangerous impact...

Cellular materials have large use in many components acting as impact energy absorbers. These components have to be designed on the basis of the kind of impact, of the involved energy amount and of the maximum admissible load. The choice of the most suitable density for the selected type of foam is based on stress-strain behaviour, obtained by...