1,721,011 research outputs found
Simple Aging Visco-Elastic Rheological Modeling of Heat Tempering in Glass Panes
No full textThe time progress and the space distribution of eigen-stresses and residual deformations in a glass pane which reaches its final solid state through a transition process of non uniform cooling is here described by means of a simple aging visco-elastic rheological model.
The aging properties of the material are temperature dependant in order to incorporate the influence of the thermal history on the final stress conditions of the solid
I giochi del disegno. Forma, costruzione e proliferazione nei pattern chiusi dai rosoni del duomo di Milano.
No full textThe terms ornament and decoration, often used interchangeably, express similar concepts with different meanings. According to the dictionary, the first tells "the elements (friezes, frames, bas-reliefs, gilding, stuccos, frescoes, marble flounces, wallpapers, etc.) that embellish the external or internal structure of a building, breaking up its nudity and monotony". In classic architecture, the decoration arises from the needs of the construction, which conditions the formal archetypes. There is an intrinsic decoration in the building. It manifests in the relationship between the signs left by the joining of the constructive elements and the wise principles of ornament. These refer to ordered repetition, depending on rules deduced by the regular conformations of nature, with the combinatorial possibilities of the same four elementary symmetries at the base of the geometric principles of decoration.
Nineteenth-century mathematicians and ornamental grammars describe the rules of drawing and the associative modalities of basic patterns, which refer to modular multiplication or circumference division. The topic refers to the plane tessellation and reflects the principles of contemporary Design Theory. At the end of the XIX century, the Polytechnic culture set the teaching of design on the same rules of ornamental grammar. Hundred years later, the developments of digital representation gave a new life to the integration between decoration and construction with the development of textile applications in architectural surfaces, decorated in their being.
Digital technologies open new paths to representation and production, joining the thinking and the making actions in a sole process that solves complexity. That gives growing relevance to decoration patterns, which contemporary aesthetics lived contradictory, alternating the rational exaltation of constructive rigor and the exaltation of ornamental design. Their constructive regularity coexists with the possibility of drawing and texturing surfaces as an effect of their properties. The gothic design shows good examples of structural decoration. The rose windows in the Milan Cathedral have different articulations in size, radial divisions, and symmetries with a limited number of both angular and radial divisions. The research focuses on the rose's pattern rules. The aim is to apply generative computation to using closed patterns in open surface tessellation. Starting from the symmetries of the dihedral rose windows, visual computation produces available solutions in the creation of parametric patterns. Overcoming the specific limits of the periodic aggregation of circular modules with constructive applications at all project scales, they underline that decoration can still be the matrix of surface design
Disegno e complessità. Verso nuovo scenari di disegno di progetto.
No full textNel processo progettuale il disegno precede l’attività costruttiva, condensando in sé tutte le istruzioni necessarie alla realizzazione. L’atto del disegnare costituisce un momento di organizzazione di idee, di gestione delle risorse e di previsione dei risultati, che si organizza secondo gli strumenti applicati. La fase di ideazione si traduce in enti geometrici elementari, tracciati attraverso supporti di immediato utilizzo che permettono la materializzazione esatta del segno. Matita, penna, riga, squadra e compasso si sono affinati lentamente ed è solo negli ultimi quattro decenni che sono stati affiancati dai sistemi informatici, che hanno introdotto un nuovo modo di concepire, sviluppare e descrivere i codici del disegno
Dynamic instability analysis of stiffened shell panels subjected to partial edge loading along the edges
No full textCopyright © 2007 Elsevier Ltd All rights reserved.The dynamic instability characteristics of stiffened shell panels subjected to partial in-plane harmonic edge loading are investigated in this paper. The eight-noded isoparametric degenerated shell element and a compatible three-noded curved beam element are used to model the shell panels and the stiffeners, respectively. As the usual formulation of degenerated beam element is found to overestimate the torsional rigidity, an attempt has been made to reformulate it in an efficient manner. Moreover, the new formulation for the beam element requires five degrees of freedom per node as that of shell element. The method of Hill's infinite determinant is applied to analyze the dynamic instability regions. Numerical results are presented through convergence and comparison with the published results from the literature. The effects of parameters like loading type and shell geometry are considered in the dynamic instability analysis of stiffened panels subjected to non-uniform in-plane harmonic loads along the boundaries. The tension buckling aspect of the stiffened panels are also considered and the dynamic stability behavior due to tensile in-plane edge loading is studied for the concentrated load. © 2007 Elsevier Ltd. All rights reserved.S.N. Patel, P.K. Datta and A.H. Sheikhhttp://www.elsevier.com/wps/find/journaldescription.cws_home/206/description#descriptio
Fractal patterns. Forms of Nature for project sustainability.
Full text linkOver the centuries, humanity has gone through various revolutions in data and information management that have increased, clarified or facilitated the evolution of knowledge. The Western world has evolved thanks to a succession of strategies developed to maximise the amount of information. The increasing computer performance has made the process of creating and transmitting data so fast and cheap to bring the information volume available to exceed a crucial threshold, leading to the advent of the so-called Big Data age. For the first time in human history, we have more data than we can handle. The discipline of drawing and representation is not exempt from this process. This density requires innovative methodologies necessary to structure the representations according to multiple scales and information supports. The computer does not understand the meanings, but unlike the human being, it can use this abnormal amount of unordered information to identify regularities. It then becomes possible to study natural phenomena and biological systems previously unassailable due to their complexity levels, to extract principles to be reproduced by digital processes in (eco)sustainable anthropogenic artefacts design. Computational design permits a high level of abstraction and more in-depth analysis that allows different disciplines hybridisation in designing artefacts whose properties are not only the result of formal, syntactic or linguistic issues, but they acquire living systems typical characteristics, such as the capacity to adapt, transform itself and self-organise. The knowledge and control of biomorphic patterns application promote project sustainability since nature always pursues the maximum efficiency of its systems. This paper presents experimental morphological studies aimed at realising artefacts with characteristics similar to natural systems.DOI: https://doi.org/10.20365/disegnarecon.26.2021.6</p
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