Continuum mechanics.

Teacher(s)

Chatelain Philippe; Doghri Issam;

Language

French

Main themes

General theory of continuous media

• Physical justification of the continuity hypothesis.
• Tensors and the concept of invariance
• Kinematics in small and large deformations
• Dynamics: stresses, Mohr's circles, conservation laws
• Energy and entropy in a continuous medium
• Equations of behavior for Newtonian fluids and elasticity
• Concept of objectivity and thermodynamic admissibility

Introduction to variational principles

• Hamiltonians and virtual powers

Applications

• Elasticity and thermoelasticity: torsion, plane states
• Newtonian fluid: Poiseuille and Couette flows

Numerical solution of problems using the finite difference method

Learning outcomes

At the end of this learning unit, the student is able to :

In consideration of the reference table AA of the program "Masters degree in Mechanical Engineering", this course contributes to the development, to the acquisition and to the evaluation of the following experiences of learning: AA1.1, AA1.2, AA1.3 AA2.3, AA2.4, AA2.5 AA3.1, AA3.3 AA5.4, AA5.5, AA5.6 The objective is to provide a general introduction to the Mechanics of continuous media, together with its elementary applications to Solid and Fluid Mechanics. At the end of his learning, the student should have assimilated the principal concepts and laws governing the kinematics and dynamics of deformable media. In addition, he should understand the application of this theory to the cases (i) of infinitesimal Thermo-Elasticity, and (ii) of Newtonian and perfect Fluid Mechanics. Moreover, he should be able to apply these concepts to the solution of simple analytical problems.

Content

Introduction: Continuity assumption, tensorial field representation, invariance. Elements of kinematics: Velocity, acceleration, pathlines, strain and rotation rates, Eulerian and Lagrangian motion representations, material derivative, small displacements, strain, rotation, compatibility equations, transport theorem (Reynolds). Dynamics: Stresses, Mohr circles, conservation laws (mass, momentum, moment of momentum, energy). Thermodynamics: Clausius-Duhem inequality. Constitutive equations. Application to Solid Mechanics: Infinitesimal Thermo-Elasticity, isotropic media, elastic moduli. Isothermal or adiabatic problems: solution existence and uniqueness, examples, beam theory (St-Venant), elastic waves. Non-isothermal problems. Application to Fluid Mechanics: Viscous Newtonian fluid, Navier-Stokes equations, Poiseuille and Couette flows, flow in a pipe, Reynolds number, non-isothermal problems. Perfect isentropic or incompressible fluid flow approximation, irrotational flows, lift of an airfoil. Acoustic waves. Appendices: Introduction to tensor calculus. Cartesian and curvilinear coordinates.

Teaching methods

Lectures:
Supports: blackboard or virtual board using a tablet. Slides are used for the main results.
Small Wooclap evaluations are performed during some of the lectures to provide a self-evaluation of the previous lectures
Exercises :
sessions supervised by a TA and tutor student, including corrections

Evaluation methods

A mid-term evaluation is organized. The obtained grade is included in the final grade if one passed the final exam (grade >= 10).
Written exam: theory (30-40%) and exercises (60-70%)
The lecturers will organize oral exams in case of technical problems during the written exam or whenever a fraud/cheating is suspected.

Other information

Prerequisite: Basic knowledge in Mathematics and Physics as obtained from previous basic formation. Evaluation procedure: Normal written exam, half on the theory and half on original exercises. Support: Lecture notes available on web page (www.mema.ucl.ac.be/teaching/meca2901). Some document photocopies are supplied if necessary. Teaching framework: exercises (in classes), and one or two interrogations (taken into account in the final evaluation in case of success). Associated stream: Basic module in Mechanics 50.10. Reduced part: Part A of the course (which does not include the application of the theory to Fluid Mechanics), includes 22,5h of theory and 22,5h of exercises, for 3,5 credits.

Online resources

https://moodle.uclouvain.be/course/view.php?id=1317

Bibliography

• Support  de cours accessible sur page Web (https://moodle.uclouvain.be/course/view.php?id=1317).
• Photocopies de documents si nécessaire.

Teaching materials

• Transparents fournis par enseignants
• Notes prises en cours par étudiants, contenu de tableau virtuel fourni par enseignant

Faculty or entity

> MECA