Search results for "SPAZI"
showing 10 items of 630 documents
A non-linear Ritz method for progressive failure analysis of variable angle tow composite laminates
2022
A Ritz formulation for non-linear analysis of damage initiation and evolution in variable angle tow composite plates under progressive loading is presented. The model is built on a few key items. It assumes first order shear deformation theory kinematics and non-liner strains in the von Karman sense. The constitutive relationships are formulated in the framework of continuum damage mechanics at the ply level, so that each laminate layer can experience in-plane damage initiation and evolution, then reflected in material softening and loss of local stiffness. A Ritz polynomial expansion of the primary variables and the minimization of the total potential energy provide the discrete solution e…
An integral framework for computational thermo-elastic homogenization of polycrystalline materials
2023
A grain scale framework for thermo-elastic analysis and computational homogenization of polycrystalline materials is proposed. The morphology of crystal aggregates is represented employing Voronoi tessellations, which retain the main statistical features of polycrystalline materials. The behaviour of the individual grains is modelled starting from an integral representation for anisotropic thermo-elasticity, which is numerically addressed through a dual reciprocity boundary element method. The integrity of the aggregate is enforced through suitable intergranular thermo-elastic continuity conditions. By virtue of the features of the underlying formulation, the polycrystalline thermo-elastic …
A coupled plasticity-damage cohesive-frictional interface for low-cycle fatigue analysis
2022
A novel thermodynamically consistent cohesive-frictional model for the analysis of interface degradation and failure under either monotonic quasi-static loading or cyclic loading in low-cycle fatigue problems is proposed. Starting from the definition of a suitable Helmholtz energy density function, a phenomenological interface model is developed in the framework of plasticity and damage mechanics. In particular, a coupled plasticitydamage activation function is defined and employed together the consistent evolution rules to capture the evolution of damage and plasticity under the action of the external loads. Due to the specific features of such threshold and flow rules, the initiation and …
A discontinuous Galerkin formulation for nonlinear analysis of multilayered shells refined theories
2023
A novel pure penalty discontinuous Galerkin method is proposed for the geometrically nonlinear analysis of multilayered composite plates and shells, modelled via high-order refined theories. The approach allows to build different two-dimensional equivalent single layer structural models, which are obtained by expressing the covariant components of the displacement field through-the-thickness via Taylor’s polynomial expansion of different order. The problem governing equations are deduced starting from the geometrically nonlinear principle of virtual displacements in a total Lagrangian formulation. They are addressed with a pure penalty discontinuous Galerkin method using Legendre polynomial…
Raiņa un Aspazijas reprezentācija laikrakstos "Diena", "Neatkarīgā Rīta Avīze" un to pielikumos 2015. gadā
2016
Tautā dēvētais Raiņa un Aspazijas gads ir aizvadīts. Tas tika īpaši atzīmēts, cilvēki pievērsa pastiprinātu uzmanību abu dzejnieku daiļradei un tautas devumam. 2015. jeb jubilejas gads īpaši izcēla abu dzejnieku tēla atpazīstamību, tāpat arī padarīja populārāku viņu daiļradi. Mediji ir viens no instrumentiem, kas vēstī par tiem. Akadēmiskā bakalaura darba “Raiņa un Aspazijas reprezentācija laikrakstos “Diena”, “Neatkarīgā Rīta Avīze” un to pielikumos 2015. gadā” teorētiskajā daļā apskatīti jēdzieni “sociālā atmiņa”, “mediju notikums”, “reprezentācija”, sniedz iespēju izprast priekšstatu veidošanos cilvēkam, konkrētajā gadījumā – par Raini un Aspaziju. Dzejnieku dzīves gājuma pētīšana sniedz…
Free vibrations of anisotropic panels
2004
A meshfree approach, called Displacement Boundary Method, for the analysis of in-plane and out-of-plane free vibrations of anisotropic plates is presented. The discretization process is based on the use of a modified variational principle and the static fundamental solutions of the problem operators. The stiffness and mass matrices are frequencyindependent, symmetric and positive definite and their computation requires boundary integrations of regular kernels only. Thus, the final resolving system can be solved with classical approaches by using standard numerical procedures. Numerical results are presented to show the accuracy and effectiveness of the method.
Metamorfosi architettonica. Teoria e didattica
2006
Questo volume si propone di tracciare un percorso che oscilla tra teoria e didattica, documentando la reciproca influenza che esiste tra l’insegnamento e la pratica dell’architettura. Grazie all’impegno degli studenti e docenti del laboratorio di progettazione, questo volume non documenta soltanto il lavoro di sperimentazione, attraverso esempi di architettura costruita e sperimentale, ma è anche l’annotazione delle nuove teorie sull’architettura in cui la progettazione è stata profondamente trasformata dalle tecnologie digitali. Nella prima parte del volume, il lettore troverà un saggio, che descrive il salto di scala che l’architettura, scritta e costruita, ha subito con l’avvento delle t…
A PU-integral on an abstract metric space.
1997
VIRTUAL ELEMENT METHOD FOR COMPUTATIONAL HOMOGENIZATIONS OF UNIDIRECTIONAL FIBER-REINFORCED COMPOSITE MATERIALS
2019
The Virtual Element Method (VEM) is a generalization of the Finite Element Method (FEM) for the treatment of general polygonal/polyhedral mesh elements. Despite its recent introduction, VEM has been applied to several problems in structural mechanics. Due to such capability of dealing with mesh elements of general shape and of naturally addressing the presence of hanging nodes, the VEM ensures a noticeable simplification in the data preparation stage of the analysis, allowing implementing a mesh generation process over complex multi-domain geometries in a fully automated way. Moreover, for the lowest order VEM used in this contribution,no numerical integration is required to compute the sys…
Sovrapposti : Processi di trasformazione degli spazi ad opera degli stranieri
2010
Nel corso del tempo le città cambiano aspetto, forma, connotazione estetica. Spesso inesorabilmente, talvolta inaspettatamente. E al loro interno cambiano le funzioni che spazi e tempi assumono nella fruizione pubblica. Ciò che ne modifica le caratteristiche strutturali. E' una dinamica di cui chi le abita si rende conto solo parzialmente, tanto è lento a volte questo cambiamento. O, al contrario, tanto repentino da non essere registrato. I luoghi "non sono più gli stessi", e dentro i luoghi coloro che vi abitano. Il che, in un'epoca di nostalgia imperante, può creare disagio. Ma in realtà il cambiamento può generare forme di rivitalizzazione del tutto inattese, soprattutto se effetto dell'…