1,354,230 research outputs found
A new explicit solution for the mode I stress fields in notched orthotropic solids
No full textThis paper deals with the stress distributions in orthotropic solids weakened by hyperbolic-shaped notches and loaded under in-plane tension. A complex potential function and proper boundary conditions are proposed from which, thanks to an optimization algorithm, a new solution is derived that can account for the geometrical features of the notch, such as the notch radius and opening angle, as well as the elastic material properties.A large bulk of results from two-dimensional finite element analyses are then compared with the derived solution, documenting its high accuracy, and showing the improvements with respect to the previous existing solution for the same problem
A Semi-Analytical Solution for the in-plane Stress Fields in Isotropic Convex Finite Solids with Circular Holes Reinforced with Cylindrically Orthotropic Rings
No full textIn this paper a semi-analytical solution for the stress distribution in a finite convex plate with a reinforced hole and subjected to a general loading condition is presented. The method described accounts for the geometrical parameters of the plate, as well as material properties and loading conditions, which can be applied internally to the hole boundary and externally to the outside boundaries of the plate. An extensive validation of the proposed solution is carried out comparing the theoretical predictions with results from various finite element analyses, showing an excellent agreement
Exact in-plane stress field solution for isotropic plates with circular holes reinforced with cylindrically orthotropic rings
No full textIn this paper an analytical solution for the stress distribution in an infinite plate with a concentrically reinforced hole under a general loading condition is derived. The developed solution explicitly accounts for the elastic properties of the plate and of the reinforcing annulus, for the hole radius to reinforcing ring thickness ratio, as well as the loading conditions, including loads applied onto the hole boundary and on the plate, far away from the hole. A careful validation of the proposed framework is carried out by comparing the newly developed solution with the results from a number of finite element analyses, documenting a very satisfactory agreement. The solution derived represents a useful tool toward the understanding of the stress fields in polymeric components with reinforced holes and made with fused deposition modelling technologies
La selezione del partner nel franchising. L’esperienza dei franchisee in Piemonte e Lombardia
No full textThis paper outlines a franchisees’ partner selection system that focuses the key role of
the franchising formula for the national economy development. The research findings
come from an exploratory study of forty-five franchisee companies operating in the Northwest
of Italy. The empirical evidences highlight the importance of strategic and
operational aspects in the partner selection processes. The study reveals the importance
of an in-depth evaluation of the franchising formula in order to assure business growth
and to reduce operational risk. The research underlines two distinct partner selection
approaches and these appear to be relevant in explaining satisfaction/dissatisfaction in
the post-contractual stage. The article suggests to innovate franchisors’ recruitment
policies and provides a specific framework for that as an effective way to sustain a vital
business network, redesign the active employment policies in the labour market and
support entrepreneurship in the service sector
ADVANCED STRESS ANALYSIS OF LONG FIBRE COMPOSITE COMPONENTS MADE WITH ADDITIVE MANUFACTURING
No full textAdditive Manufacturing (AM), commonly known as 3D printing, has revolutionized traditional manufacturing by enabling the production of intricate and customized structures. It brings advantages such as the creation of components with complex geometries and the potential for cost savings, especially in scenarios with low production volumes. However, drawback of this technology exists, notably the propensity for unwanted porosity in parts. Among the various technologies falling under the umbrella of Additive Manufacturing, this thesis focuses on Fused Deposition Modeling (FDM), prevalent in the field of composite materials. The main contributions of the thesis include the development of several analytical models that consider the effects of defects and design features introduced by FDM manufacturing processes. These models specifically address stress states in composite bodies, focusing on factors like porosities and localized reinforcements. The analytical models are validated against Finite Element methods, demonstrating their reliability in describing stress field in the studied areas.
Despite the challenges posed by AM, the analytical models presented in this thesis serve as a robust foundation for developing effective tools to predict the elastic behavior and fatigue life of components manufactured using additive manufacturing technology, particularly in the context of FDM
Interaction between diclofenac and Soil Humic Acids
No full textThe interaction between the non-steroidal anti-inflammatory drug diclofenac and standard humic acids (HAs) in bulk solution was studied using two complementary analytical methods: UV-Visible spectroscopy and square wave voltammetry. The observed UV-Vis spectra and Ip/V curves suggested that, at our experimental conditions, albeit both substances being negatively charged at pH 6.5, interaction between the pharmaceutical and the soil humic acids may led to the formation of diclofenac-humic acids supramolecules.
Our results could contribute to give information on the behaviour of diclofenac into the soil environment, thus suggesting its migration as HAs-micelles through the coarse soil profile
Stress distributions in orthotropic solids with blunt notches under in-plane shear loadings
No full textThe present work is devoted to the analysis of the stress distributions in orthotropic solids weakened by blunt notches and loaded under in-plane shear. In particular, using Lekhnitskii's approach, new closed form equations are derived for the stress components, explicitly accounting for the notch geometrical features, namely the notch radius and the opening angle, in conjunction with the elastic material properties.Three main geometries are considered, described using proper conformal mappings: lateral symmetric hyperbolic notches, parabolic notches and hyperbola-like notches in plates loaded under in-plane shear. Appropriate complex potential functions are introduced in the analytical formulation and analytical expressions for the whole stress fields are derived, taking advantage of free-of-stress boundary conditions along the notch edge.Eventually, the very good accuracy of the new solutions is proved against numerical results, as obtained from a number of two-dimensional finite element analyses carried out on plates with rounded notches under shear, also discussing the main features of the mode II stress fields in notched plates
Nino Pozzo il burattinaio di Verona
No full textIl volume raccoglie attraverso dodici saggi l'esperienza dell'omonima mostra ospitata in Museo Casa Giorgione di Castelfranco Veneto da dicembre 2019 a giugno 2020 dedicata a Bepe Pastrello noto burattinaio del XX secolo. All'interno del volume è presente la riedizione del "diario" di Pastrello intitolata "Un po' della mia vita"
Valorizzazione di un patrimonio culturale periferico: il progetto "Cuore Verde tra i due Laghi" / The enhancement of the peripherial cultural heritage: the project “Cuore Verde tra i due laghi” (Green Heart between the two Lakes)
No full textLo studio è indirizzato a esplorare le potenzialità dei metodi partecipativi per la valorizzazione di patrimoni culturali periferici. In rapporto al descritto obiettivo, è stato sviluppato un caso-studio concernente le Comunità rurali tra il Lago Maggiore e il Lago d’Orta. L’area rurale è caratterizzata dalla presenza di un patrimonio culturale periferico rispetto al circuito delle attività turistico-culturali in Piemonte, ma il piano di valorizzazione ha attivato iniziative per vivacizzare il territorio e superare la condizione di marginalità. Il caso-studio si basa sull’applicazione della metodologia Participatory Action Research (PAR) per favorire il coinvolgimento di stakeholders locali in posizione marginale. Lo studio individua linee guida per la generalizzazione della metodologia nei processi di valorizzazione di un patrimonio culturale periferico.
The article aims to explore the potential of participative methods to enhance the value of peripheral cultural wealth. Consistent with the described aims, a case study was developed with a focus on the rural communities between Lago Maggiore (Maggiore Lake) and Lago d’Orta (Orta Lake). The rural area is characterised by the presence of peripheral cultural heritage comparing tourist and cultural proposals in Piedmont, but a cultural plan has been developed to animate the local context and to overcome the condition of isolation. The case study is based on Participatory Action Research (PAR), involving stakeholders in marginal positions. The results identify best practices to generalize the methodology in order to enhance the value of peripheral cultural wealth
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