Nonlinear vibrations of symmetric cross-ply laminates via thermomechanically coupled reduced order models

Thermomechanically coupled, geometrically nonlinear, laminated plates are addressed through a unified 2D formulation, by considering classical and third-order shear-deformable von Karman models, along with correspondingly consistent linear and cubic variations of the temperature along the thickness. Minimal dimension reduction of the mechanical problem is accomplished for symmetric cross-ply laminates, ending up for both models to a coupled three-mode reduced model with terms and coefficients of variable nature depending on the variety of mechanical and/or thermal excitations. Nonlinear vibrations of the classical model are investigated in conditions of thermal dynamics either passively entrained by the harmonically varying transverse load via the existing coupling terms, or also playing some active role owed to a temperature difference with respect to the surrounding medium

Modelling and Nonlinear Dynamics of Third-Order Thermomechanically Coupled Laminated Plates

Thermomechanically coupled, geometrically nonlinear, laminated plates are addressed through a unified 2D formulation that integrates mechanical and thermal aspects and consistently accounts for cubic variations along the thickness of both in-plane displacement components and temperature. It allows to address a variety of thermal boundary conditions on the plate upper and lower surfaces. Minimal dimension reduction of the problem is pursued for symmetric cross-ply laminates. A numerical case study provides hints on the potential of the reduced model for the analysis of thermomechanical coupling effects on the system nonlinear dynamics

How to increase the sustainability of the agri-food supply chain through innovations in 4.0 perspective: a first case study analysis

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Lean production as a tool for green production: the Green Foundry case study

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Modeling, Dimension Reduction, and Nonlinear Vibrations of Thermomechanically Coupled Laminated Plates☆

Abstract A unified formulation of thermomechanical, geometrically nonlinear, laminated plates that integrates mechanical and thermal aspects is presented. It allows for constructing and comparing a variety of continuous models of different mechanical richness and with full thermoelastic coupling embedded, as well as for deriving minimal reduced order models suitable to provide useful information on fundamental thermomechanical phenomena occurring in the system nonlinear and complex dynamics. Comparative numerical investigations of free and forced vibrations can be carried out through both models of three, fully coupled, ordinary differential equations and simplified, partially coupled, models of two, or even one, ODEs, with the aim to unveil the actual importance of accounting for the various terms to reliably describe the most important thermomechanical effects on the system response

Drag Breakdown of SU2 Solutions around Aircraft

The breakdown of the aerodynamic force in physical components is an important topic in Aerodynamics. The standard near field method is based on the the body surface stress integration and can only provide a decomposition in friction and pressure drag. Far field methods, based on the integration of the momentum flux on a far surface enclosing the body give the chance to decompose the drag in viscous, wave and lift-induced components, more interesting for the aerodynamic designer. We developed two methods for aerodynamic drag breakdown. The thermodynamic method, decomposes the irreversible drag in viscous and wave components. Identifying a spurious drag contribution, it allows for improved drag calculations on coarse grids. The vortex-force method provides a direct definition of lift-induced drag in viscous subsonic and transonic flows. We present here some applications of both drag breakdown methods by post-processing SU2 solutions around bodies and wings

3D limit analysis of masonry pavilion domes on octagonal drum subjected to vertical loads

Within the framework of limit design applied to masonry structures, this paper aims at analyzing the different behavior of a pavilion dome according to the adopted construction and reinforcement technologies. By using the static theorem applied to the dome discretized in rigid macro-blocks of variable shape aligned along parallels and meridians, a mathematical model have been constructed in order to search for the load collapse multiplier, and thus to evaluate the degree of structural safety. Then, the associated failure mechanism is represented at the instant in which the collapse is reached. The program that implement the modeling is sufficiently versatile and, in addition to the mechanical characteristics, allows to define the intrados profile, the thickness variability, as well as to insert any window opening in the drum, the lantern at the top and the hoops at each level. The results shown here concern some numerical applications carried out on a theoretical dome, as well as those related to a first approach to the analysis of the dome of Santa Maria del Fiore in Florence by Brunelleschi

Estrategias de solución para análisis de consolidación acoplados en medios porosos

Se revisan brevemente las estrategias empleadas usualmente para resolver las ecuaciones acopladas del problema de la consolidación de suelos saturados. Luego se introduce un nuevo esquema basado en la solucion particionada del conjunto de ecuaciones acopladas y se desarrollan los criterios de convergencia y estabilidad necesarios.Peer Reviewe

Characterization of T Lymphocytes in Chronic Obstructive Pulmonary Disease

A new study adds to the mounting evidence implicating T cells as an important component of the inflammation in chronic obstructive pulmonary diseas