IRIS - UNIRSM (Univ. degli Studi della Repubblica di San Marino)
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C0 FEM approximation of nonlocal strain gradient beams and plates via Lagrange Multiplier Method and Schur decomposition
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Gestión de las interacciones durante una lección sobre la diferencial: una competencia del profesor de matemáticas
Full text linkLa valutazione della programmazione fonologica in età scolare: una nuova proposta clinica
No full textComputational simulation and acoustic analysis of two-dimensional nano-waveguides considering second strain gradient effects
No full textPrediction of fatigue life of a bolted joint in railway steel arch bridge using multiaxial fatigue criteria
No full textFatigue represents a critical condition for infrastructure subjected to repeated cyclic loads, such as steel railway bridges. The literature offers several methods to estimate fatigue life, consisting of three main phases: cycle counting, fatigue damage criterion, and damage accumulation criterion. Applying S-N curves might not be conservative in the case of railway bridges subjected to traffic because the stress-time history is complex and cannot be reduced to a sinusoidal history. Additionally, the presence of a multiaxial stress state must be considered. Therefore, this work compares eight multiaxial fatigue damage criteria for evaluating fatigue life in a scenario between high and low-cycle fatigue. Specifically, the authors considered four low-cycle fatigue criteria, namely Smith–Watson–Topper (SWT), Kandil, Brown and Miller (KBM), Glinka, Fatemi and Socie (FS), and four high-cycle fatigue criteria, Crossland, Basquin and the methods recommended by Eurocode 3 and British Standard. The rainflow counting method in ASTM E1049-85 (2011) and Miner’s rule for damage accumulation were used. The Polcevera railway steel bridge was selected as a case study. A 3D numerical model was developed for this purpose using Midas Civil software, taking into account the material non-linearity of the bridge’s elements. Once the area with the highest stress concentration was identified, a detailed analysis was conducted to estimate the stress and strain time histories induced by train traffic. A sensitivity analysis was conducted after critically comparing the eight methods for predicting fatigue life to assess the impact of traffic parameters, train velocity, axle load, and convoy length on fatigue life. It has been found that the criteria considering axial stress tend to overestimate the number of fatigue cycles to failure compared to the criteria, including the effect of shear stress components
Interventi progettuali discreti in spazi museali. Utilizzo di tecnologie digitali per la fruizione di esperienze interattive naturali.
No full textIl contributo propone una riflessione e una conseguente proposta di ricerca nell’ambito del design per la valorizzazione del patrimonio culturale attraverso l’utilizzo di tecnologie digitali. Tali strumenti, utili a creare narrazioni multilivello, catturare l’attenzione e coinvolgere i visitatori, talvolta si configurano come elementi che, per le loro caratteristiche tecniche, ostacolano la fruizione e la fluidità dell’interazione. Mediante la disamina dei campi di ricerca legati all’Ubiquitus Computing – ad esempio: Calm Technologies, Natural User Interfaces, Slow technologies, Ambient Interaction, Implicit Interaction, Subtle Interaction e Personal Interaction – la ricerca ha l’obiettivo di delineare modalità teoriche e applicative con cui sia possibile adottare in modo proficuo le tecnologie abilitanti all’interno dell’ambito musealeThe paper proposes a reflection and a research proposal in the field of design for the enhancement of cultural heritage through the use of digital technologies. Such tools, which are useful for creating multilevel narratives, capturing attention and engaging visitors, sometimes configure themselves as elements that, due to their technical characteristics, hinder the fruition and the fluidity of interaction. Through the examination of research fields related to Ubiquitus Computing – such as: Calm Technologies, Natural User Interfaces, Slow technologies, Ambient Interaction, Implicit Interaction, Subtle Interaction, and Personal Interaction - the research aims to outline theoretical and applicative ways in which enabling technologies can be profitably applied within the museum
