Search results for "paz"
showing 10 items of 1302 documents
Il Belice. Uso del territorio e urbanistica dal basso.
2008
Dibattere del bene: una difesa fenomenologica della ragion pratica
2021
Nel nostro tempo, il corretto dibattere appare sempre più raro, in particolare quando sono in gioco temi come il bene, i valori, la libertà. Il testo mette in luce alcune conseguenze per l’educazione della contemporanea rinuncia all’esercizio della ragion pratica. Nelle r argomentazioni presentate é costante il riferimento all’etica fenomenologia e in particolare al pensiero di Hannah Arendt e alle sue ascendenze kantiane.
Application of the 3-D boundary element method to delaminated composite structures
2013
A three-dimensional boundary element model for anisotropic solids is presented to study the fracture mechanics behavior of delaminated composite structures. The multi-domain technique is implemented to model the layered configurations and the cracks occurring at bi-material interface. The Modified Crack Closure Integral technique is implemented to characterize the fracture mechanics behavior of delaminations in terms of the total energy release rate and mode mix phase angles. Validating analyses, performed on different delaminated configurations, have shown the effectiveness of the proposed approach. Moreover, some original results are presented to investigate the effects of the stacking se…
Multidomain BEM for crack analysis in stiffened anisotropic plates.
2014
The present paper is concerned with the application of a boundary element model for the analysis of cracks in stiffened composite panels. The panel stiffeners are reduced to equivalent strips and the multidomain technique is used to model panel zones presenting different properties (skin and stiffeners equivalent strip). Also the crack is modeled exploiting the multidomain formulation. Evaluation of stress intensity factors is performed for representative problems.
Borges: Libro-Mundo y Espacio-Tiempo
2011
La continua tensione che esiste tra la pulsione decifratrice dell’uomo e l’incomprensibilità delle leggi che regolano l’universo è la base dialettica su cui si costruisce il discorso, dalla dinamica sapienziale, che sta alla base della metafora del Libro-mondo, nella sua più precisa accezione di Liber Naturae. Nel caso di Galileo la metafora del libro mondo serviva ad affermare, con la propria potenza dirompente, il tentativo di codificare una nuova concezione della scienza e della natura. Una nuova visione del mondo si affermava attraverso l’opposizione tra la lettura diretta del libro della natura e quella indiretta rappresentata dai libri di Aristotele. Borges utilizza la stessa metafora…
Borges: Libro-Mondo e Spazio-Tempo
2010
La continua tensione che esiste tra la pulsione decifratrice dell’uomo e l’incomprensibilità delle leggi che regolano l’universo è la base dialettica su cui si costruisce il discorso, dalla dinamica sapienziale, che sta alla base della metafora del Libro-mondo, nella sua più precisa accezione di Liber Naturae. Nel caso di Galileo la metafora del libro mondo serviva ad affermare, con la propria potenza dirompente, il tentativo di codificare una nuova concezione della scienza e della natura. Una nuova visione del mondo si affermava attraverso l’opposizione tra la lettura diretta del libro della natura e quella indiretta rappresentata dai libri di Aristotele. Borges utilizza la stessa metafora…
Fundamental solutions for general anisotropic multi-field materials based on spherical harmonics expansions
2016
Abstract A unified method to evaluate the fundamental solutions for generally anisotropic multi-field materials is presented. Based on the relation between the Rayleigh expansion and the three-dimensional Fourier representation of a homogenous partial differential operator, the proposed technique allows to obtain the fundamental solutions and their derivatives up to the desired order as convergent series of spherical harmonics. For a given material, the coefficients of the series are computed only once, and the derivatives of the fundamental solutions are obtained without any term-by-term differentiation, making the proposed approach attractive for boundary integral formulations and efficie…
Global/Local FEM-BEM stress analysis of damaged aircraft structures
2008
In this paper a Hierarchical approach for the analysis of advanced aerospace structures is presented. The proposed Global/Local model uses two kind of numerical methods. The first step of the Hierarchical procedure is performed by the Finite Element code Patran/Nastran™, using a coarse mesh to study the global structure, then the local region is analyzed by using a Boundary Element code based on the multidomain anisotropic technique. This code accurately predicts stress concentrations at crack tips with a reduction of the modeling efforts and of the computational time. The Global/Local interface code implemented allows an intuitive extraction of the local region with a substantial reduction…
Analysis of composite laminates with imperfect bonding conditions
2007
A multidomain boundary integral formulation for the analysis of composite laminates with imperfect interlaminar interfaces is presented. An imperfect interface refers to a zero-thickness interfacial layer across which displacement discontinuity may occur while interlaminar tractions must remain continuous. The displacement discontinuity is considered through a spring model in order to model the adhesive layer among two adjacent laminae. No auxiliary elements are needed to implement the imperfect interface since the spring coefficients, characterizing the different bonding interface conditions, are taken into account inside the assembled influence matrices. To assess the reliability and the …
A model for low-cycle fatigue in micro-structured materials
2020
A microscale formulation for low-cycle fatigue degradation in heterogeneous materials is presented. The interface traction-separation law is modelled by a cohesive zone model for low-cycle fatigue analysis, which is developed in a consistent thermodynamic framework of elastic-plastic-damage mechanics with internal variables. A specific fatigue activation condition allows to model the material degradation related to the elastic-plastic cyclic loading conditions, with tractions levels lower than the static failure condition. A moving endurance surface, in the classic framework of kinematic hardening, enables a pure elastic behaviour without any fatigue degradation for low levels of cyclic tra…