Search results for " COSTRUZIONE"
showing 10 items of 481 documents
On relation between J-integral and heat energy dissipation at the crack tip in stainless steel specimens
2019
In this paper, an experimental procedure to evaluate the elastic-plastic J-integral at the tip of a fatigue crack is presented. According to this new approach, the elastic component of the J-integral is derived from Thermoelastic Stress Analysis, while the plastic component of the J-integral is derived from the heat energy loss. An analytical link is proposed to apply this new experimental technique. Therefore, the elastic-plastic J-integral range was evaluated starting from infrared temperature maps measured in situ during crack propagation tests of AISI 304L stainless steel specimens. It was found that the range of the infrared thermography-based J-integral correlated well the crack growt…
Ingegnerizzazione di una macchina prototipale per processi di saldatura linear friction welding
2012
Influence of the anisotropy of sisal fibers on the mechanical properties of high performance unidirectional biocomposite lamina and micromechanical m…
2021
Abstract High performance biocomposites reinforced by sisal fibers, are between the most promising materials that could be used in various fields, from automotive to civil constructions, thanks to their good mechanical performance, as well as to the low cost and the great availability of the fiber. Nevertheless, at present their practical use is prevented by the limited knowledge of their mechanical performance. The results of the present study have shown that the intimate fibrillar structure of the sisal fiber is associated with a high anisotropy involving not only the elastic parameters, but also the damage processes with typical fiber splitting phenomena, that influence noticeably the bi…
A quantitative investigation on the thermoelastic effect of CFRP laminates
2009
The thermoelastic effect on CFRP laminates with various lay-ups is investigated. A thick low crimp unidirectional fabric reinforcement is adopted. The measured thermoelastic signal is compared with predictions from two analytical models based on the meso-mechanical bulk properties of the lamina and on assuming a strain witness behaviour of the surface resin rich layer.
STUDIO DI UN’APPLICAZIONE IN CAMPO AERONAUTICO DI COMPOSITI STRUTTALI IBRIDI RESISTENTI AL FUOCO
2013
In the aeronautical/aerospace structural design the increasing demands of materials having high mechanical performance, has led to the a wide use of Polymeric Matrix Composites (PMCs) mainly reinforced by carbon fibers (Carbon Fiber Reinforced Plastics, CFRP). The main drawbacks in the use of such composites are due to high sensitivity to environmental features and low working temperatures; moreover, these materials do not tolerate the fire exposure because of the inflammability of both the matrix and the fibers. In order to develop a composite that combines the structural performance of CFRP with a good strength to high temperatures and fire, in the present work the use of a hybrid composi…
Lithuanian wooden architecture : materials, ancient tools and constructive technologies for the safeguard of cultural heritage
2017
L'architettura in legno in europa costituisce uno dei più rappresentativi elementi del patrimonio da preservare. In questo studio si diescrivono le tipologie edilizie, i materiali, le tecniche costruttive e gli utensili dell'architettura lignea in Lituania, spesso ritrovati e ben dicumentati nei musei etnografici del Paese. Queste opere di carpenteria lignea devono essere ben studiate e d analizzare per garantirne la valorizzazione e la salvaguardia, utilizzando criteri di intervento compatibili e rispettosi dei caratteri originari dei manufatti. Traditional wooden buildings are a valuable part of European cultural and architectural heritage. The construction of wooden buildings presents a …
The traditional sacral wooden construction in Lithuania. An illustrated catalogue of building techniques for the safeguard and recovery of cultural h…
2015
La Lituania attualmente può annoverare un patrimonio di circa 600 edifici sacri in legno ancora esistenti, sui quali, ad oggi, non sono stati condotti studi approfonditi in merito agli aspetti storico/architettonici e tecnico/costruttivi. Questa tipologia di edifici costituisce un patrimonio della cultura architettonica locale da esplorare e conoscere, per garantirne la corretta conservazione e valorizzazione. La maggior parte di questi edifici di culto in legno versa in condizione di degrado poiché le comunità non sempre possiedono la dovuta attenzione e le competenze tecniche capaci per salvaguardare tale patrimonio. Le cause più frequenti di danno derivano da una inadeguata manutenzione,…
SISTEMI VERDI COME CULTURA RIGENERATIVA: STRUMENTI E TECNOLOGIE
2021
The study analyzes and proposes in the historical and in the area immediately to it adjacent, the "values-nature" of the buildings through the creation of gardens wall and vertical gardens in the elevatiloy of non-monumental buildings. The study deepens in particular the specificity of the garden roof and the garden vertical, recognizing benefits and critical issues that distinguish these green systems for construction. It also deepens the concept of resilience in close relationship sustainability and regenerative design applied to the built environment. The theme of regenerative design is studied and promoted as an adaptive strategy at the design stage; it requires you to leave nature stre…
Trame mediterranee
2011
Breve riflessione sulla circolazione di maestri e maestranze nel Mediterraneo occidentale come fattore di trasmissione di sistemi costruttivi e modelli formali in architettura, tra tardomedievo e prima età moderna.
Preliminary design of a magnetorheological brake for automotive use
2011
After an initial study of the characteristics of magnetorheological fluids based on a thorough search in literature, a preliminary configuration of MR brake is proposed. It comes from the evaluation of the main factors influencing the design of an appropriate magnetic circuit, and then the performance obtained in terms of brake torque. The analytical study of the brake has allowed a first preliminary sizing. Through the subsequent execution of an electromagnetic finite element model, created in ANSYS, it was possible to assess more accurately the distribution of the magnetic field inside the MR fluid and hence the resistance to relative motion between rotor and stator. The work needs an acc…