Physics and Mechanics of Material Behaviour - 4PMMPMC4

Goal(s)

• To understand the properties of crystalline defects (in particular dislocations) responsible for plastic deformation of structural materials
• To know the relationship between the microstructure of a material and its mechanical properties (yield limit, plasticity)
• To understand the physical mechanisms that control the constitutive equations for the plasticity of structural materials at room temperature and a high temperature
• To feel comfortable with the tools of continuum mechanics
• To know the formalism of basic constitutive equations used to model the mechanical behavior of materials
• To discover the potentialities of industrial codes dedicated to the simulation of forming processes

Content(s)

Course and controled work
Part 1 :

• Crystalline defects: nature and properties
• Yield limit : quantitative link with the microstructure
• Thermal activation of plastic deformation
• Room temperature plasticity: physics of constitutive equations
• High temperature plasticity: physics of constitutive equations

Part 2:

• Continuum mechanics: stress and strain tensors, constitutive equations
• Elasticity : Hooke’s law, thin films
• Plasticity : criteria, isotropic and kinematic hardening, Hill Principle, associated flow law
• Viscoplasticity : strain-rate hardening, creep, Norton’s law, dissipation potential, Odqvist’s law

Practical work
Simulation of a forming process with an industrial finite element code (Ansys, Forge2, Forge3). Emphasis is put on constitutive equations presented during the course (plasticity, viscoplasticity)