Search results for " Materiali"
showing 10 items of 710 documents
Una mañana en Oporto : apuntes de un viaje en la arquitectura de Álvaro Siza
2023
Per un architetto il viaggio è una impareggiabile occasione di studio, poiché permette di compiere una reale esperienza dello spazio, consente di valutare con i propri sensi ciò che altrimenti sarebbe sempre mediato dal disegno, dalla fotografia, dai testi o da altre rappresentazioni. La visita ad alcune architetture di Álvaro Siza, diviene occasione per una analisi critica e consente di estrarre alcune lezioni sul rapporto con i luoghi, sui caratteri dello spazio, sulla materialità, sull’impiego della luce, sul valore del dettaglio.
The effect of through-thickness compressive stress on mode II interlaminar fracture toughness
2017
Abstract The effect of through-thickness compressive stress on mode II interlaminar fracture toughness is investigated experimentally and replicated numerically. The modified Transverse Crack Tensile specimen recently proposed by the authors is used, together with an experimental device designed to apply a constant transverse compressive stress on the surface of the specimen. Experiments are conducted using IM7/8552 specimens for different compressive stresses, ranging from 0 to 100 MPa, covering all the practical applications commonly encountered in the aeronautical industry (e.g., tightened filled holes or bolted joints). It is shown that mode II interlaminar fracture toughness increases …
Structural performances of pultruded GFRP emergency structures – Part 2: Full-scale experimental testing
2019
Abstract This paper presents an experimental testing of a pultruded glass fiber reinforced polymer (FRP) structure used for emergency applications continuing the discussion presented in a previous paper (part 1) where the study of the characteristics of material and elements are presented. First, the design of the composite structure and components and the evaluation of the structural behavior by means of numerical and analytical approach according to current regulatory codes are described. In this frame, the global and local response was observed according to load paths deriving from the design loads at limit states. Then, the experimental test on a full-scale 2D model is presented at diff…
The reception of Marx's thought in the young Habermas
2018
RESUMEN Se analiza la influencia del pensamiento de Marx en la formulación temprana de la teoría habermasiana. Para ello, se parte de las críticas de Albrecht Wellmer y Jürgen Habermas a la autocomprensión marxiana del materialismo histórico. Luego se estudia la reconstrucción de algunos postulados del marxismo llevada a cabo por Habermas en términos de una renovada teoría de la evolución social. Con ello salen a la luz algunos supuestos básicos de la teoría de Marx que aparecen trasformados en la conceptualización de Habermas y que constituyen una base ineludible para comprender el posterior pensamiento de este autor. ABSTRACT The article analyzes the influence of Marx's thought on the for…
Behavior in compression of concrete cylinders externally wrapped with basalt fibers
2015
Abstract This paper gives additional information on the use of new class of composites constituted by Basalt Fiber Reinforced Polymer (BFRP) bonded with epoxy resin to concrete specimens as an alternative confinement material for compressed concrete members with respect to carbon or glass fibers. From the experimental point of view, concrete cylinders are wrapped with continuous fibers, in the form of sheets, applying both full and partial discrete wrapping with BFRP straps, and then tested in compression. For comparison, few other concrete cylinders are wrapped with Carbon Fiber Reinforced Polymer (CFRP) sheets and tested in compression. The number and type of plies (full or partial wrappi…
On the use of PET-LCP copolymers as compatibilizers for PET/LCP blends
1996
Copolyesters of poly[ethylene terephthalate) (PET) with a liquid crystalline polymer (LCP), SBH 1:1:2, have been synthesized by the polycondensation, carried out in the melt at temperatures up to 300 degrees C of sebacic acid (S), 4,4'-dihydroxybiphenyl (B), and 4-hydroxybenzoic acid (H) in the presence of PET. The PET-SBH copolyesters have been characterized by differential scanning calorimetry, scanning electron microscopy, X-ray diffraction, etc., and the relationships between properties and preparation conditions are discussed. The copolyesters show a biphasic nature, which is more evident for the products synthesized with a thermal profile comprising relatively lower temperatures (220-…
Controlling Thermal Flows through Natural Materials in Building Construction Sector
2019
Nowadays, the attention about the building sustainability is increasingly emerging, because of the major responsibility of the building field on the environmental degradation: both in terms of energy consumption from non-renewable sources and the raw materials impoverishment. In addition, the level of comfort required by users is growing and the thermal insulation of buildings becomes the key element for the reduction of energy consumption and CO2 emissions, both in the case of new construction and of the existing ones. The heat load of a building depends on the presence of insulating material which defines the performance of the building envelope. The main purpose of this work is both to i…
INFLUENCE OF CORK POWDER GRAINSIZE IN THERMAL AND MECHANICAL PROPERTIES OF CORK-NHL MORTARS
2019
Cork is a unique material, characterized by small closed cell structures, high insulating properties, very low density, high fire resistance and a very good durability after simple thermal treatment. The main use of cork in the production of stopper and insulating panels obtained with cork grains and a polymeric resin. Usually cork grains used in panel production have a grainsize around 1-2 mm. In this work cork grains have been used as aggregates for natural hydraulic lime mortars by reducing grainsize distribution. Cork grainsize has been reduced by means of a knife mill and divided in three different distributions, i.e. 1, 0.5 and 0.25mm. Mortars have been prepared according to NHL to co…
Corporazioni, maestranze e mestieri d’arte a Palermo al tempo di Giacomo Amato (1643-1732)
2017
Ci si sofferma sull'attività poliedrica delle varie corporazioni e maestranze palermitane il cui operato, tra la seconda metà del XVII e i primi decenni del secolo successivo, è affiancato dall'estro creativo di Giacomo Amato e da altre emergenti personalità che incisero notevolmente nel rinnovamento artistico della città di Palermo.
Effect of the UV exposure on the creep behaviour of PLA based green composites
2018
Green composites made of biodegradable matrices and lignocellulosic fibers are receiving growing attention from both academia and industries. Despite a wide literature can be found about mechanical behavior of such kind of composites, at the best of our knowledge, only limited information is available about their creep behavior [1] and no papers have been yet done on the effect of ultraviolet exposition. The tensile creep behavior at 40 °C of PLA based composites, containing flax and jute twill weave woven fabrics, produced through compression molding, was investigated. As preliminary characterization, quasi-static tensile tests were carried out on virgin and UV aged composites