Carlo Brutti

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• Master of Engineering
• Professor (Full) at University of Rome Tor Vergata

In the field of renewable energy source, the wind power is certainly one of the most important and therefore the industrial and research community are devoting increasing attention to the design, construction, management and maintenance of wind turbines. Due to the relevance, technical, economic and social of this type of installation the correct m...

FEM high-fidelity modeling is a useful method for evaluating the dynamic behavior of civil structures and their state of damage through the processing of real-time vibration data in the frame of the general Structural Health Monitoring. The development of reliable digital twin involves the use of high-fidelity models, which must be validated with e...

Sommario In questo studio si mostra come la modellazione FEM possa essere utilizzata per simulare l'emissione di onde acustiche, causata da un'estensione locale o dalla nascita di un difetto nella struttura. Il metodo di controllo non distruttivo basato sulle emissioni acustiche è alla base di sistemi di monitoraggio accurati e affidabili. L'elabor...

The present paper addresses the numerical fluid-structure interaction (FSI) analysis of a thermowell immersed in a water flow. The study was carried out implementing a modal superposition approach into a computational fluid dynamics (CFD) solver. The core of the procedure consists in embedding the structural natural modes, computed by a finite elem...

Instrumented indentation is widely used to evaluate the hardness and other mechanical properties of materials. This requires a theoretical model for the indentation curve (load vs. penetration) based on the Young's modulus, Poisson's coefficient, yield stress, hardening exponent, friction, and shape of the indenter. Several papers have been devoted...

Fractal analysis appears to be a relevant tool toward the interpretation of acoustic emissions signals related to the stress and damage of the material and this paper shows how it can be adopted for health monitoring of various structures. The fractal dimension quantifies the order/disorder of the signals and is correlated to the applied stress/pre...

The acoustic emission (AE) method is well studied for its capability to detect and locate discontinuity that evolve in time, when a pressure tank is charged with a greater load than the usual one. When the discontinuity is a crack the AE is able to follow the nucleation and the propagation of the defect in the material. For this paper, experiment o...

The study and design of cyclically loaded structures cannot neglect the evaluation of their fatigue behavior. Today numerical prediction tools allow adopting, in various industrial fields, refined and consolidated procedures for the assessment of cracked parts through analyses based on fracture mechanics. An high level of detail can be obtained thr...

This paper presents a method of interpolation and regularisation of finite element (FE) results based on radial basis functions (RBF) capable to upscale at a finer resolution the displacement fields and, accordingly, the strains and the stresses obtained with a coarse mesh. RBF interpolation of nodal displacements supplies an analytical approximati...

In this paper a method to improve the stress state on a 2D finite element (FE) Q1 coarse mesh for fracture mechanics applications is shown. Radial Basis Functions (RBF) are employed synergically with balance equations to reduce the interpolation error and improve results extracted from the coarse FEM models. In addition to FE nodes, RBF interpolati...

This paper reports the study of the effects of washer on the strength of bolt-nut connections. We developed a complete theoretical calculation procedure, modifying the classical Maduschka's approach, to determine the load distribution and then we proposed an assembly of different results available in bibliography to evaluate the stress state at the...

The DEMO reactor is expected to be the first application of fusion for electricity generation in the near future. To this aim conceptual design activities are progressing in Europe (EU) under the lead of the EUROfusion Consortium in order to drive on the development of the major tokamak systems. In 2014 the activities carried out by the magnet syst...

Shape functions provide the deformation field inside a finite element from the nodal displacements: however it is known that this procedure entails a continuity issue. In this paper we propose a postprocessing tool based on radial basis functions (RBFs) taking as input the results of FEM analyses. This strategy uses RBFs to interpolate the nodal di...

This paper reports the main outcomes of the 2013 design activities for the toroidal field magnet of the European nuclear fusion reactor DEMOnstration Power Plant (DEMO). Within the current project plan, the manufacture of full-size conductor prototypes during 2014 and their test during 2015 are foreseen, aimed at the assessment of the proposed cabl...

Demonstration fusion reactors (DEMO) are being envisaged to be able to produce commercial electrical power. The design of the DEMO magnets and of the constituting conductors is a crucial issue in the overall engineering design of such a large fusion machine. In the frame of the EU roadmap of the so-called fast track approach, mechanical studies of...

Operational modal analysis is an interesting procedure that allows identification of the modal characteristic parameters of structures excited randomly by environmental loads. In this paper, an existing operational modal technique, the natural excitation technique is studied and implemented to obtain the modal parameters of the Vega launcher excite...

Research efforts during recent decades qualify Operational Modal Analysis (OMA) as an interesting tool that is able to identify the modal characteristic parameters of structures excited randomly by environmental loads, eliminating the problem of measuring the external exciting forces. In this paper, an existing OMA technique, the Natural Excitation...

The clearances in the kinematic joints are due to deformations, wear, and manufacturing errors; the accurate modeling of these effects in multibody analysis is a complex issue but in many practical applications, it is mandatory to take into them into account in order to understand the actual behavior of mechanical systems. In this paper, the author...

In this paper, a brief review of design methods for corrugated board containers subjected to compressive loads is presented. The main request for a corrugated board package is the capability to resist stacking loads. The principal tool used in industrial application is actually a simplified formula derived from theoretical considerations. In this w...

The long-term success of an implant supported prosthesis depends on many variables. In addition to the osseointegration rules that are commonly acknowledged, a clinician should consider also the biomechanical concepts related to the manufacturing process of a prosthetic structure assembly and their effects on the bone/implant interface. These conce...

This article discusses three possible methodologies for designing domestic ovens. Correct oven cavity design is at the heart of all good self-cleaning ovens. In fact, this design element is often the starting point for new oven projects. Some of the key challenges facing engineers include complying with cost budgets (especially those concerning mat...

This paper is focused on the buckling and post buckling behaviour of rectangular corrugated board panels simply supported and subjected to compression load. The aim of the work is to understand the failure mechanism of investigated structure in order to quantify the effect of design parameters on the strength of a panel of given geometry. Two numer...

In this paper the activities developed in design and realization of a corrugated board aircraft capable to join the “Redbull Flugtag – A Day With Wings” are presented. Starting from competition requirements, the flight problem has been analyzed analytically, then a finite element model of the aircraft has been realized in order to verify its struct...

In this paper, a new acoustic emission (AE) diagnostic technique, for the study of fatigue cracks nucleation and propagation on steel, was investigated. Using the fractal analysis, and the box-counting method (BCM) in particular, it is possible to characterize the spatial distribution of the prime AE sources through the fractal dimension (D) that e...

In this paper the problem of approximate evaluation of the frequencies of orthotropic plates is investigated. Starting from a general approximate formula for the frequency, proposed by Hearmon, it is shown how to calculate the fundamental mode of an orthotropic rectangular plate with different restraint conditions using the proper coefficient value...

Sommario Le caratteristiche degli imballaggi di cartone riguardo alla capacità di carico e alle possibilità di impilamento dipendono dal comportamento a compressione dei pannelli con cui sono realizzati: tale comportamento è influenzato dal materiale, dalla geometria e da parametri tecnologici. Anche dopo il raggiungimento della condizione di incip...

The buckling behaviour of corrugated paper packages was studied by means of an experimental and theoretical analysis. Mechanical behaviour of paperboard was first evaluated experimentally, then a local geometry FEM model, able to reproduce with a very good accuracy buckling loads obtained experimentally in the standard edge compression test, was de...

Cardan and double Cardan homokinetic joints have a wide spectrum of application in vehicle design. This paper proposes mathematical models for mechanical efficiency and torque analysis. The problem of fatigue analysis has been adressed. In particular, it has been investigated the influence of working parameters on the life expectancy of the joint....

In this paper, a numerical technique is exposed to study the fatigue life of notched elements with arbitrary shaped cracks. In structural design, one of the most important activities is to evaluate the life under fatigue load. Recently, many research efforts were devoted to define reliable procedures able to estimate initiation and growth of cracks...

The aim of this work is to develop a simulation tool able to foresee the dynamic behaviour of a vehicle involved in an emergency manoeuvre. This tool is suitable to reproduce the real dynamic of an accident and so could be exploited both for road safety analyses and both for accident reconstruction. In order to perform the dynamic analysis we have...

In this paper a shape optimisation method is exposed. The optimum shape of a three- dimensional structure was searched to obtain the minimum weight with prescribed constraint on stiffness and maximum stress. The calculations were performed directly on the FEM model of the structure without links to the original geometric model: shape evolution was...

In this paper the crack growth emerging from a notch is studied for round bar under symmetric load condition. Modifying and synthesising some models found in literature, a method for fatigue life prediction is outlined and verified. The model takes into account the elastic-plastic crack growth and the change of crack shape during propagation. Overa...

A Note from the Editors Vol.5, No.2 & 3, 1998: Maple in Industry This MapleTech special issue—Maple in Industry—is one in a series of special issues devoted to specific topics of interest to MapleTech readers. The themes covered span areas such as: chemical process design and simulation; mechanical engineering design; operations research and cont...

Kinematic analysis of spatial mechanisms is a task often required of industrial designers. Common tools for this task are expensive general-purpose programs. The following Maple program enables the user to quickly generate, in symbolic form, all the equations needed for a complete kinematic analysis of spatial mechanisms. The formulation is quite g...

The basic causes of failure of dissimilar metal welds (DMW) between ferritic and austenitic steels are related to differences in coefficient of thermal expansion between the base materials and to local metallurgical changes near the interface low-alloy steel/weld metal due to the prolonged exposure to elevated temperature. This paper describes the...

Several self-stressed specimens cut from austenitic — ferritic transition joints were repeatedly submitted to thermal cycling from room temperature to 593°C. Stress fields were evaluated by a linear elastic F.E.M. Metallurgical evolution of microstructures was investigated through optical metallography and microhardness tests. No cracks have been d...

The elastic behaviour of static sealing rings used for flanged joints was studied to investigate the hypothesis that the presence of a 'shoulder' at the external edge of the seal inihibits free deformation. Results are presented which indicate that the existence of a shoulder can modify the stress and deformation pattern of the seal, sometimes seve...

A new correlation parameter named CER (Cavitation Erosion Resistance) is proposed in order to evaluate the erosion resistance of materials to cavitation attack. The authors explain the origin of CER and justify its expression by means of the analysis of the erosive phenomenon. Information about its calculation are given and moreover its correlation...

Comparative cavitation tests between beryllium copper and aluminium bronze are performed. Among various Cu-Be alloys, alloys 25 is chosen which is the most resistant of this class. Among the aluminium bronzes, ASTM B148-9D alloy is considered, being it one of the strongest and most utilized copper-base material for marine propellers and impellers....

Moiré-holograms contain a parallel-line grating recorded during the exposure process of the model grid under three-dimensional deformation. Utilizing the diffraction of a white light beam striking the holoplate, frozen moiré patterns can be observed, under proper angles, directly by reflection. With a Fourier transform optical system, the reconstru...

Sommario In questo lavoro viene analizzato dal punto di vista numerico e sperimentale il comportamento di pneumatici per go-kart. In questi veicoli, sprovvisti di sistemi di sospensione, lo pneumatico oltre a garantire la trasmissione della potenza motrice al suolo, ha anche il compito di garantire il trasferimento dei carichi durante la marcia, in...

SOMMARIO In questo lavoro viene presentata un'indagine sperimentale mirata alla valutazione delle caratteristiche di rigidezza di pannelli di cartone ondulato. Ci si propone in particolare di valutare l'andamento direzionale di tali caratteristiche, eseguendo prove semplici su provini ricavati in cinque direzioni (0°, 30°, 45°, 60°, 90°), dove 0° c...

For the design of fusion machine IGNITOR, it has been planned the activity related to numerical simula tion of butt welding between two INCONEL 625 plates. The main purpose of this study is to verify the feasib ility of proper simulation of welding process in order to predict the way of execution that assure a reasona ble result, evaluating final s...