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Showing 1 to 20 of 41 for “"Settore ICAR/08 - Scienza delle Costruzioni"”.
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Dislocations and Green's functions in prestressed solids
The present Ph.D. dissertation is divided into two Parts: Green's function and problems of the inclusions and dislocations are addressed in the first Part, while implementation of elastoplastic constitutive laws are treated in the second. These subjects can be seen as different approaches to the …
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Development of Devices Based on Electrically Actuated Soft Elastomers
Dielectric elastomer (DE) actuators are electromechanical transducers that essentially consist of one layer of an insulating soft elastomer coated on both sides with com- pliant electrodes. When a voltage is applied between the electrodes, an electrostatic pressure deforms the elastomer triggering …
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Performance Optimisation of Dielectric Elastomer Generators
A Dielectric Elastomer Generator (DEG) is an electromechanical transducer, basically a highly deformable parallel-plate capacitor, made up of a soft DE membrane coated with two compliant electrodes on its opposite surfaces. This device is able to convert mechanical work, emanating from its …
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Stability analysis of edge corrugated shells
The practical construction of reinforced concrete shells highlights two points, both of theoretical and practical interest: 1. in the neighbourhood of the edge, the membrane state is not representative of the actual stress and strain, and the effect of bending moments must be taken into account; 2. …
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Modelling Masonry as a Continuum: Finite Element Analysis using ABAQUS
The preservation of masonry structures, deeply intertwined with human history and culture, poses significant engineering challenges. Engineers work to ensure the safety and longevity of these structures through meticulous analysis of their structural integrity. However, conventional elastic …
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Mechanical and physical characterization of graphene composites
During my PhD activities, I studied the introduction of carbon-based nanofillers in materials at different scales, while focusing primarily on fibres and fibrillar materials. Several production techniques were exploited. Little is known about the interaction of graphene with electrospun polymeric …
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Structural-model experiments revealing bifurcation, instability and localization
Small scale experiments are invented to analyze several aspects of instability and bifurcation occurring in structures and within materials. Photoelasticity is employed to analyze the localization of stress in ordered granular materials and near stiff and thin inclusions embedded in an elastic …
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Buckling of thin-walled cylinders from three dimensional nonlinear elasticity
TThe present work addresses the rigorous derivation of the Flügge treatment of the buckling of a thin cylinder. The incremental equilibrium equations in terms of generalized stresses are rigorously derived in terms of mean quantities (holding true regardless of the thickness of the cylinder), …
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Seismic Behavior of concrete filled steel Tubular Built-up columns
With the advantages of CFST built-up columns, including the higher confinement in the concrete, delay of the steel local buckling, higher compressive and flexural strength, earthquake and fire resistance, rapid construction, savings in the construction costs, etc. CFST built-up columns are …
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Thermomechanical modelling of powder compaction and sintering
An elastic-visco-plastic thermomechanical model for cold forming of ceramic powders and subsequent sintering is introduced and based on micromechanical modelling of the compaction process of granulates. Micromechanics is shown to yield an upper-bound estimate to the compaction curve of a granular …
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Stress singularities, annihilations and invisibilities induced by polygonal inclusions in linear elasticity
Notches, wedges, cracks, sti?eners, inclusions and defects in plane elastostatics are known to generate singular stresses and limit the overall strength of a composite material. In the present thesis, after showing experimentally that the singular stress ?eld predicted by the linear elastic …
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Multilayered Structures under large Bending: Finite Solution and Bifurcation Analysis
Finite plane strain bending is solved for a multilayered elastic–incompressible thick plate. This multilayered solution, previously considered only in the case of homogeneity, is in itself interesting and reveals complex stress states such as the existence of more than one neutral axis for certain …
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Homogenization of heterogeneous Cauchy-elastic materials leads to Mindlin second-gradient elasticity
Through a second-order homogenization procedure, the explicit relation is obtained between the non-local parameters of a second gradient elastic ma- terial and the microstructure of a composite material. This result is instru- mental for the definition of higher-order models, to be used for the …
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Eshelby-like forces in elastic structures: theory, experiments and applications
The Eshelbian force is the main concept of a celebrated theoretical framework associated with the motion of dislocations and, more in general, defects in solid. Similarly, it is proven that a force driving the configuration of an elastic structure is generated through the motion and release …
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Modelli meccanici per l'innesco e la propagazione delle valanghe di neve
… di modelli per l’innesco e la propagazione delle valanghe di neve, la presente tesi si focalizza sul fenomeno dell’innesco, seguendo prima un approccio meccanico tensionale/energetico per poi passare ad un approccio fisico-statistico. Ciò è dovuto sia alla consapevolezza che gli approcci …
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Hardening Cohesive/Overlapping Zone Model and Fractal Approach to Ductile Fracture
Most of fracture parameters (K, G, J-integral, COD) break down, especially for ductile materials and large crack extensions. In addition, even at small scale yielding, K, G, J- integral and COD are limitedly used to distinguish the onset of unstable fracture, without any concern regarding the …
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Testing and characterization of innovative cementitious materials: addressing a CO2 circular economy in the cement industry
L'abstract è presente nell'allegato / the abstract is in the attachment
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Online Joint Identification of Structural Dynamic Response Anomalies and Structural Damage Using Limited Data
Structural Health Monitoring (SHM) systems aim to enable real-time assessment of structural conditions by continuously collecting structural response data through sensor networks, while leveraging advanced techniques for data processing and analysis. However, their practical application remains …
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Instability of Dielectric Elastomer Actuators
Dielectric elastomers (DEs) are an important class of materials, currently employed in the design and realization of electrically-driven, highly deformable actuators and devices, which find application in several fields of technology and engineering, including aerospace, biomedical and mechanical …
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