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Séance de cours

Théorie des faisceaux non linéaires: Mécanique de la structure mince

Dans cours

ME-411: Mechanics of slender structures

Analysis of the mechanical response and deformation of slender structural elements. ...

Description

Cette séance de cours couvre les relations déformation-déplacement pour un faisceau non linéaire, les simplifications de la théorie générale, la relation constitutive du premier ordre pour le comportement élastique linéaire, les équations d'équilibre à partir des méthodes variationnelles et la petite déformation à rotation modérée pour les anneaux circulaires.

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Enseignant·e

Pedro Miguel Nunes Pereira de Almeida Reis

Pedro M. Reis is a Professor of Mechanical Engineering at the École Polytechnique Fédérale de Lausanne (EPFL) in Switzerland, where he is the Director of the Institute of Mechanical Engineering. Prof. Reis received a B.Sc. in Physics from the University of Manchester, UK (1999), a Certificate of Advanced Studies in Mathematics (Part III Maths) from St. John’s College and DAMTP, University of Cambridge (2000), and a Ph.D. in physics from the University of Manchester (2004). He was a postdoc at the City College of New York (2004-2005) and at the CNRS/ESPCI in Paris (2005-2007). He joined MIT in 2007 as an Instructor in Applied Mathematics. In 2010 he moved to MIT’s School of Engineering, with dual appointments in Mechanical Engineering and Civil & Environmental Engineering, first as the Esther and Harold E. Edgerton Assistant Professor and, since the summer of 2014 as Gilbert W. Winslow Associate Professor. In October 2013, the Popular Science magazine named Prof. Reis to its 2013 “Brilliant 10” list of young stars in Science and Technology. He has received the 2014 CAREER Award (NSF), the 2016 Thomas J.R. Hughes Young Investigator Award (Applied Mechanics Division of the ASME), the 2016 GSOFT Early Career Award for Soft Matter Research (APS), he is a Fellow of the APS, and he is the 2021 President of the Society of Engineering Science (SES).

Source officielle

Proximité ontologique

Mathématiques

Géométrie: Géométrie différentielle

Génie chimique

Science des matériaux: Deformation of materials

Concepts associés (32)

Finite strain theory

In continuum mechanics, the finite strain theory—also called large strain theory, or large deformation theory—deals with deformations in which strains and/or rotations are large enough to invalidate assumptions inherent in infinitesimal strain theory. In this case, the undeformed and deformed configurations of the continuum are significantly different, requiring a clear distinction between them. This is commonly the case with elastomers, plastically-deforming materials and other fluids and biological soft tissue.

Infinitesimal strain theory

In continuum mechanics, the infinitesimal strain theory is a mathematical approach to the description of the deformation of a solid body in which the displacements of the material particles are assumed to be much smaller (indeed, infinitesimally smaller) than any relevant dimension of the body; so that its geometry and the constitutive properties of the material (such as density and stiffness) at each point of space can be assumed to be unchanged by the deformation.

Linear elasticity

Linear elasticity is a mathematical model of how solid objects deform and become internally stressed due to prescribed loading conditions. It is a simplification of the more general nonlinear theory of elasticity and a branch of continuum mechanics. The fundamental "linearizing" assumptions of linear elasticity are: infinitesimal strains or "small" deformations (or strains) and linear relationships between the components of stress and strain. In addition linear elasticity is valid only for stress states that do not produce yielding.

Tension de cycle

En chimie organique, la tension de cycle ou contrainte cyclique désigne la déstabilisation d'une molécule cyclique, telle un cycloalcane, causée par l'orientation spatiale des atomes qui la composent. Cette tension provient d'une combinaison (1) de contrainte d'angle, (2) de contrainte de torsion (ou tension de Pitzer) et (3) de la tension trans-annulaire (ou contrainte de van der Waals).

Stress–strain curve

In engineering and materials science, a stress–strain curve for a material gives the relationship between stress and strain. It is obtained by gradually applying load to a test coupon and measuring the deformation, from which the stress and strain can be determined (see tensile testing). These curves reveal many of the properties of a material, such as the Young's modulus, the yield strength and the ultimate tensile strength. Generally speaking, curves representing the relationship between stress and strain in any form of deformation can be regarded as stress–strain curves.

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Séances de cours associées (37)

Ductilité locale et mondiale

Examine la relation entre les différentes ductilités en génie sismique, en soulignant leur importance dans les éléments structuraux.

Points de courbure et d'inflexion

Explore la courbure, les points d'inflexion et les fonctions angulaires dans les courbes planes, soulignant l'importance des points d'inflexion.

Déformation et déformation Tenseurs de souches

Explore les tenseurs de déformation et de déformation, la représentation de Lagrange, la théorie de l'élasticité et le théorème de divergence.

Faisceaux sous flexion

Discute des contraintes dans les poutres sous flexion, y compris les forces de cisaillement et les moments de flexion.

Théorie des faisceaux non linéaires Connectez-vous à Mediaspace pour regarder cette vidéo

Couvre les relations souche-déplacement, les équations d'équilibre et l'énergie fonctionnelle dans la théorie des faisceaux non linéaires avec une petite souche et une rotation modérée.

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Concepts associés (32)

Finite strain theory

Infinitesimal strain theory