IRIS - UNIRSM (Univ. degli Studi della Repubblica di San Marino)
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Foam core composite sandwich plates and shells with variable stiffness: Effect of the curvilinear fiber path on the modal response
No full textThis paper presents the free vibration analysis of composite sandwich plates and doubly-curved shells with variable stiffness. The reinforcing fibers are located in the external skins of the sandwich structures according to curved paths. These curvilinear paths are described by a general expression that combines power-law, sinusoidal, exponential, Gaussian and ellipse-shaped functions. As a consequence, the reinforcing fibers are placed in these orthotropic layers in an arbitrary manner, in order to achieve the desired mechanical properties. The effect of this variable fiber orientation on the natural frequencies is investigated by means of several parametric studies. As far as the structural theory is concerned, an Equivalent Single Layer (ESL) approach based on the well-known Carrera Unified Formulation (CUF) is employed. The Murakami’s function is added to the kinematic model to capture the zig-zag effect, when the soft-core effect is significant. Thus, several Higher-order Shear Deformation Theories (HSDTs) are taken into account in a unified manner. The differential geometry is employed to describe the reference surface of doubly-curved shells and panels, which are characterized by variable radii of curvature. The numerical solution is obtained using the Generalized Differential Quadrature (GDQ) method, due to its accuracy and stability features. The present solution is compared with the results available in the literature or obtained by finite element commercial codes
La 'libertas ecclesiastica' nel 'regnum Sicilie' del XIII secolo. Alcune riflessioni per un percorso di ricerca.
No full text'The Ideal Man': Amedeo Nazzari, Fatherhood, and Italy's Melodramatic Masculinity
No full textThis article investigates the stardom of Amedeo Nazzari, both in his pre-war cinematic roles as war hero, and in post-war cinema, where he played the pater familias in a series of melodramas directed by Raffaello Matarazzo and produced by Titanus from 1949 to 1954. While Fascism conceptualized heroism as action and patriotic sacrifice, post-war Italian screen culture redefined the coordinates of heroism through new impersonations of suffering masculinity. Nazzari’s stardom, moving from roles of military virility to melodramatic father figures, negotiated issues of gender, sexuality, class, and national identity during the transition from Fascist dictatorship to democracy
Free Vibration Problem of Composite Plates of Arbitrary Shape: Where Do We Stand?
No full textThe free vibration problem of flat plates is one of the most studied problem in structural mechanics of the last century. However, in recent years the use of composite materials for plated structures has increase enormously. Therefore, researchers focused their efforts in employing several numerical techniques for studying such configurations. The most common engineering theory for isotropic and composite plates is the well-known Reissner-Mindlin theory or First-order Shear Deformation Theory (FSDT). FSDT is assumed to be valid from thin up to moderately thick plates due to its initial hypothesis on the linear kinematic field and negligible through the thickness stress and strain. When composite plates are introduced other hypotheses are needed on the stacking sequence configurations. FSDT demonstrated to work very well for isotropic configurations and for any structural shape. Laminated composite plates of arbitrary shape due to their complex configuration can be difficult to treat analytically and they are generally treated numerically. The most common numerical tool is the Finite Element Method (FEM) which is a weak form domain decomposition approach. Other techniques, for instance based on the strong form, has been recently developed. In the present work, the authors will show convergence accuracy and reliability of both approaches by comparing the natural frequencies of several arbitrarily shaped plates made of isotropic and composite materials
Luca Demontis, Enrico di Castiglia senatore di Roma (1267-1268). Diplomazia, guerra e propaganda tra il comune di "popolo" e la corte pontificia, Edizioni Antonianum, Roma 2017, p. 218 (Medioevo, 28).
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