Search results for " COSTRUZIONE"
showing 10 items of 481 documents
Determination of Torsional Stresses in Shafts: From Physical Analogies to Mathematical Models
2015
This paper presents the historical development of methods used for the study of torsional stresses in shafts. In particular, the paper covers both analog methods, especially those based on electrical analogies proposed circa 1925, and numerical methods, especially finite difference methods (FDM), finite element methods (FEM) and boundary element methods (BEM).
A penalty-based finite element interface technology
2002
Abstract An effective and robust interface element technology able to connect independently modeled finite element subdomains is presented. This method has been developed using the penalty constraints and allows coupling of finite element models whose nodes do not coincide along their common interface. Additionally, the present formulation leads to a computational approach that is very efficient and completely compatible with existing commercial software. A significant effort has been directed toward identifying those model characteristics (element geometric properties, material properties and loads) that most strongly affect the required penalty parameter, and subsequently to developing si…
Robotic path planning for non-destructive testing – A custom MATLAB toolbox approach
2016
AbstractThe requirement to increase inspection speeds for non-destructive testing (NDT) of composite aerospace parts is common to many manufacturers. The prevalence of complex curved surfaces in the industry provides motivation for the use of 6 axis robots in these inspections. The purpose of this paper is to present work undertaken for the development of a KUKA robot manipulator based automated NDT system. A new software solution is presented that enables flexible trajectory planning to be accomplished for the inspection of complex curved surfaces often encountered in engineering production. The techniques and issues associated with conventional manual inspection techniques and automated s…
Media e rappresentazione del femminile tra conformismo e cambiamento
2015
Il saggio analizza le modalità di rappresentazione dl femminile nei media italiani, con particolare riferimento ai processi di costruzione e/o rafforzamento di stereotipi
Analisi di alcuni aspetti dell'Ingegneria dell'Autoveicolo per una Mobilità Sostenibile: Ambiente, Incidentalità e Materiali.
2018
Sin dai tempi antichi l’uomo, per andare incontro ai suoi bisogni ha avuto la necessità di spostarsi; da questo suo insito bisogno è nato, dunque, il concetto di mobilità, che riguarda non solo lo spostamento di persone da un luogo ad un altro, ma anche lo spostamento di beni di consumo utili alla vita di tutti i giorni, tramite gli odierni mezzi di trasporto. La mobilità in quanto forma di spostamento, ovvero le modalità di trasporto, hanno necessariamente bisogno di energia per poter funzionare. La portata di energia necessaria alla mobilità è ingente, data l’enorme entità di persone, merci ed informazioni che necessitano di spostarsi oggigiorno. Per una mobilità efficiente e veloce è anc…
Modica: la fabbrica della città
2016
PREMESSA. Non crediamo sia necessario soffermarsi sul fondamentale ruolo della manualistica come base conoscitiva e tecnica nel progetto di recupero. Ma chi analizza l’architettura storica di aree ristrette, connotate il più delle volte da specificità e tipicità, sa bene che la “regola dell’arte universale” è una contraddizione in termini, e che nell’architettura dei nostri centri urbani pluristratificati necessitano la valorizzazione e la tutela della varietà e della differenza, della dimensione locale come alternativa ad una condizione periferica. Ciò comporta la necessità di acquisire, attraverso l’approfondimento delle tipologie di base e delle caratteristiche dei materiali, sia morfolo…
Investigating the effect of residual stress on hydrogen cracking in multi-pass robotic welding through process compatible non-destructive testing
2021
Abstract In this paper, the effect of Welding Residual Stress (WRS) on the size and morphology of hydrogen-induced cracks (HIC) is studied. Four samples were manufactured using a 6-axis welding robot and in two separate batches. The difference between the two batches was the clamping system used, which resulted in different amounts of welding deformation and WRS. The hydrogen cracks were intentionally manufactured in the samples using a localised water-quenching method, where water was sprayed over a specific weld pass in a predetermined position. The Phased-Array Ultrasonic Testing (PAUT) system was implemented during the welding process (high-temperature in-process method), to detect the …
Implementation of active infrared NDT techniques using long square heating pulses
2012
The present work describes the implementation of active IR Thermography techniques for the NDT of thick polymer and glass-fibre reinforced polymer (GRP) composite panels. A low cost Thermal NDT set-up is proposed, comprising a single-detector IR camera with low thermal resolution and low frame rate, and common low-power halogen lamps as external heat source devices. The use of halogen lamps in particular requires several seconds of switch-on time in order to deliver meaningful and effective heat quantities. The influence of such long heat deposition intervals is investigated on the possibility to implement Transient Thermography and Lock-In Thermography techniques. Regarding the Transient T…
PAUT inspection of complex shaped composite materials through 6 DOFs robotic manipulators
2015
The requirement to increase inspection speeds for the non-destructive testing (NDT) of composite aerospace parts is common to many manufacturers. The prevalence of complex curved surfaces in the industry provides significant motivation for the use of six-axis robots for the deployment of NDT probes in these inspections. The IntACom project, developed by TWI Technology Centre (Wales) and supported by a number of major aerospace partners and the Welsh government, has produced a prototype robotic NDT system. The prototype system is capable of inspecting complex-geometry composite components with great time savings. Two six-axis robotic arms deploy end effectors carrying phased array ultrasonic…
Electrical Conduction in Carbon Nanotubes under Mechanical Deformations
2009
The enormous potential of carbon nanotubes (CNTs) as primary components in electronic devices and NEMS necessitates the understanding and predicting of the effects of mechanical deformation on electron transport in CNTs. In principle, detailed atomic/electronic calculations can provide both the deformed configuration and the resulting electrical transport behavior of the CNT. However, the computational expense of these simulations limits the size of the CNTs that can be studied with this technique and a direct analysis of CNTs of the dimension used in nano-electronic devices, particularly multi-wall CNTs (MWNTs), seems prohibitive at the present. Here a computationally effective mixed finit…