Search results for " SCIENZA"

showing 10 items of 1301 documents

Delamination study of Z-pinned composite laminates via two-phase interface model.

2008

One of the most effective technique, developed over the last decade, to enhance the strength of the composite laminates in the thickness direction (z-direction), is the through-thickness reinforcement in form of stitching [2], [4] or short rods inserting [3]. These reinforcing fibres, providing direct closure tractions to the potential delamination crack faces (bridging effect), increase the interlaminar fracture toughness. The reinforcement system can be applied extensively to the composite laminate or restricted to those critical structural zones that are subjected to high interlaminar stresses. The through-thickness reinforcement is also used in composite-composite assemblages where, cou…

delamination through-thickness reinforcement interfaceSettore ICAR/08 - Scienza Delle Costruzioni
researchProduct

Il tempo nella scienza. La scienza nel tempo

2011

didatticatempo scienzaSettore CHIM/02 - Chimica Fisica
researchProduct

Heat-resistant unfired phosphate ceramics with carbon nanotubes for electromagnetic application

2014

Composite materials, containing low concentrations of carbon nanotubes (CNTs) of three different diameters and heat-resistant phosphate ceramic as a matrix were prepared by cold-pressing method. Their dielectric properties were studied at room temperature in a wide frequency range (20 Hz–1 MHz). It was found experimentally and proved theoretically via modeling of the composites as a random capacitor–resistor–diode network that electrical percolation concentration depends significantly on the diameter of the nanoinclusions. The main conclusion is that the best candidate providing both the lower percolation threshold and high absolute values of ac conductivity is thinner carbon nanotubes (in …

dielectric permittivitySettore ING-IND/22 - Scienza E Tecnologia Dei Materialiunfired ceramicscarbon nanotubephosphateSettore CHIM/02 - Chimica Fisica
researchProduct

La cultura del postmodernismo giuridico: considerazioni a margine di un volume recente

2013

diritto e leggecultura scienza e tecnica del dirittoSettore IUS/01 - Diritto PrivatoPostmodernismo giuridico
researchProduct

STRAIN ENERGY EVALUATION IN STRUCTURES HAVING ZONE-WISE PHYSICAL- MECHANICAL QUANTITIES

2013

Among the possible aims of structural analysis inside some engineering spheres it can be useful to know the strain energy stored in all or in a part of the structure caused by assigned external actions, like the boundary and domain quantities. This serves to evaluate globally whether an assigned portion of structure undergoes an excessive store of energy able to compromise the stability of all the structure. This evaluation can be carried out through boundary work obtained using appropriate boundary generalized quantities connected to the results of the analysis on the whole structure. The advantage consists in using a very restricted number of quantities which, because of the characteristi…

displacement methodSubstructuring approachenergy evaluationSettore ICAR/08 - Scienza Delle Costruzioni
researchProduct

Strain energy evaluation in structures having zone-wise physical-mechanical quantities

2013

displacement methodsubstructuring approachSGBEMSettore ICAR/08 - Scienza Delle Costruzionienergy evaluation.
researchProduct

A fractionally-damped duffing oscillator driven by stochastic agencies

2012

duffing oscillator fractionally-dampedSettore ICAR/08 - Scienza Delle Costruzioni
researchProduct

CAN PUBLIC EDUCATION EXPENDITURE REDUCE THE SHADOW ECONOMY?

This paper empirically examines whether devoting more resources to education can reduce the size of the shadow economy on a cross-section of countries. The findings show a negative relationship between public education expenditure and the size of the shadow economy, which is robust to the inclusion of different proxies for the control variables, a large set of policy variables and regional differences. The findings also suggest that an increase in educational attainment can reduce the size of the shadow economy.

educationSettore SECS-P/03 - Scienza Delle Finanzeshadow economy taxation.government expenditure
researchProduct

Non linear analysis of 3D elastoplastic framed structures

2014

elastoplastic frames finite elements lumped hinge modelSettore ICAR/08 - Scienza Delle Costruzioni
researchProduct

Active macro-zone approach for incremental elastoplastic-contact analysis

2013

The symmetric boundary element method, based on the Galerkin hypotheses, has found an application in the nonlinear analysis of plasticity and in contact-detachment problems, but both dealt with separately. In this paper, we want to treat these complex phenomena together as a linear complementarity problem. A mixed variable multidomain approach is utilized in which the substructures are distinguished into macroelements, where elastic behavior is assumed, and bem-elements, where it is possible that plastic strains may occur. Elasticity equations are written for all the substructures, and regularity conditions in weighted (weak) form on the boundary sides and in the nodes (strong) between cont…

elastoplasticitymultidomain SGBEM elastoplasticity contact/detachment linear complementarity approachlinear complementarity approachSettore ICAR/08 - Scienza Delle CostruzioniMultidomain SGBEMcontact/detachment
researchProduct