Search results for "CFR"
showing 10 items of 32 documents
Numerical analysis and experimental comparison on CFRP reinforced masonry walls subjected to transverse loads
2009
The out-of-plane behaviour of walls, unreinforced and reinforced by using CFRP strips, is studied by means of experimental investigation and numerical modelling. The FEM model is based on a linear constitutive law both for the ashlars and the mortar joints constituting the masonry and the lines of potential delamination are taken into account by means of an interface element with bi-linear law, reproducing the opening failure mode. When the reinforcement is introduced, an interface element with bi-linear law is also used, reproducing the sliding failure mode. Comparison between the numerical and experimental results shows the reliability of the modelling. Moreover, a parametric analysis is …
Analisi quantitativa dell'effetto termoelastico in materiali compositi CFRP
2008
Mode I fracture toughness behaviour of epoxy resincarbon fiber composites cured by ionising radiation
2012
In this work Mode I fracture toughness behavior of Electron Beam cured unidirectional CFRP laminates is investigated by means of standardized Double Cantilever Beam (DCB) tests. A matrix system, comprising a DGEBA epoxy monomer and a typical initiator of cationic polymerization, was used and panel samples assembled by hand lay-up. Curing was achieved by 20 to 40 minutes irradiation on a pulsed 10 MeV Electron Beam accelerator. One batch of resin was also mixed with 10 phr of a PES thermoplastic monomer in order to enhance the matrix toughness. The influence of fibre-matrix adhesion, matrix toughening and matrix crosslinking density on the mode I delamination behavior have been investigated …
SHARP: Environment and Person Independent Activity Recognition with Commodity IEEE 802.11 Access Points
2022
In this article we present SHARP, an original approach for obtaining human activity recognition (HAR) through the use of commercial IEEE 802.11 (Wi-Fi) devices. SHARP grants the possibility to discern the activities of different persons, across different time-spans and environments. To achieve this, we devise a new technique to clean and process the channel frequency response (CFR) phase of the Wi-Fi channel, obtaining an estimate of the Doppler shift at a radio monitor device. The Doppler shift reveals the presence of moving scatterers in the environment, while not being affected by (environment-specific) static objects. SHARP is trained on data collected as a person performs seven differe…
La écfrasis pictórica en la poesía de Irene Sánchez Carrón
2008
En este artículo se desarrolla el análisis comparado de dos poemas de Irene Sánchez Carrón, titulados “Después del baño, mujer secándose” (del libro Porque no somos dioses, Premio de Poesía Hermanos Argensola de 1997) y “Habitación de hotel. 1931” (de Escenas principales de un actor secundario, Premio de Poesía Adonais de 1999), que tienen en común su carácter de ejercicio ecfrástico. Asimismo, se analizan las fuentes pictóricas de Edgar Degas y Edward Hopper que aparecen en la génesis de los poemas. El comentario exhaustivo de las obras ayudará a ilustrar el viejo problema, planteado al menos desde Lessing, de los medios, los modos y los objetos con que literatura, por un lado, y artes plá…
La écfrasis en las versiones tardías del poema épico bizantino de "Diyenís Akritis"
2018
El presente trabajo se ocupa de todas las écfrasis que aparecen en los cuatro manuscritos tardíos del poema épico bizantino de Diyenís Akritis. Al principio se presentan los fragmentos a estudiar y se lleva a cabo su análisis estructural. Se pone especial énfasis en las seme-janzas y las diferencias en la presentación de las écfrasis. Se presta interés a las fuentes y al papel funcional en cada texto.
Mode I fracture toughness behavior of hydro-thermally aged carbon fibre reinforced DGEBA-HHPA-PES systems
2012
In this work the Mode I fracture toughness behavior of unidirectional CFRP laminates is investigated by means of Double Cantilever Beam (DCB) tests. The composite samples were manufactured by thermal curing after impregnation of a Carbon fabric with a DGEBA epoxy and anhydride HHPA curing agent. One resin batch was also mixed with a PES thermoplastic monomer to enhance the matrix toughness. Two lots of samples, toughened and un-toughened, were then left to soak in hot water to achieve various degrees of aging. The influence of matrix toughening and hydrothermal aging on the delamination behavior of the composite have then been assessed and correlated with characterization data from Dynamic …
Interface behaviour of bonded CFRP-Calcarenite stone joints
2010
This paper presents the results of an experimental study investigating the interface behaviour between calcarenite stone and Carbon Fibre Reinforced Polymer (CFRP) reinforcement. The analysis of the results has allowed to deduce the local behaviour at the interface, which can be modelled by means of a bi-linear shear stress-slip law, according to several codes. The experimental investigation was carried out on specimens subjected to double shear pulling tests by varying the bond length of the CRFP strips. Tests enabled determination of the bond strength of the joint and the effective bond length. The parameters of the stress-slip law were calibrated on the experimental results in order to c…
Damage accumulation and life prediction in carbon fibre composite pressure vessels
2009
Composites and nanostructures
Strengthening of masonry walls subjected to out-of-plane loads using CFRPs
2007
This paper presents an experimental investigation carried out on masonry panels subjected to axial load and bending moment in the plane of minor inertia. The masonry type consist of calcarenite ashlars and mortar joints; the reinforcement is made of Carbon Fibres Reinforced Polymer (CFRP) strips applied with the wet-lay-up system. Tests are carried out with controlled displacements. Results have been recorded at each step in terms of: horizontal force and corresponding displacements; moment and curvature at the base of the wall; strains on the CFRP strips near the base of reinforced specimens in order to observe the delamination phenomen. Comparison between the results relative to unreinfor…