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MATS7AB

In service mechanical Mechanical behaviour of materials

ECTS Credits : 2 

Duration : 21 hours

Semester : S7

Person(s) in charge:

Mohammed NOUARI, Professor, mohammed.nouari@mines-nancy.univ-lorraine.fr 

Keywords:

Mechanical properties, characterization, mechanic of solids, elasticity, plasticity, break

Prerequisites: 

Basics in mathematics and physics (tensors, primitives, energy, work).

Objectives:

Presentation of mechanical properties, principle of structures calculation.

Program and Contents:

• Mechanical properties of the main classes of materials, depending on the atomic bonding
• Elastic behaviour: stress and strain tensors, Hooke’s law, Mohr representation
• Mechanical testing methods: tensile test, hardness, creep, fatigue, impact test
• Plastic behaviour: elastic limit, plasticity criteria, law for plastic flow, necking
• Introduction to the finite element method in elasticity, concept of thermal stress
• Failure: basics of fracture mechanics, fracture toughness, fatigue, stress corrosion cracking

Case studies:

• bending of a beam, influence of the shape of the cross section
• proportioning of a propeller shaft
• analysis of a tensile test curve
• contact mechanics, hardness test
• elasto-plastic behaviour of a pressure vessel
• stress concentrations at cavities, bi-material contactor (finite elements)
• in service behaviour of a vapour generator, safety control

Abilities: 

Level

Description et operational verbs

Know

Every object used for structural or functional applications undergoes forces. It must have the dimensions required to withstand these forces without yielding. Its lifetime in service depends on the type of material used, on the nature of the mechanical loading (bending,twisting - monotonic or cyclic - shocks) and on the environmental conditions (temperature,corrosion). Engineers must anticipate the behaviour of a mechanical part under these diverse solicitations to determine its dimensions, estimate its lifetime and chose the appropriate material.

Understand
 

Apply 

- know the differences in mechanical behaviour of materials in relation with their structure,
- know the behaviour laws and the usual experimental methods to measure them,
- have good grounding in structure calculation (modelling, solving, analysing the results).

Analyse 

Summarise

Assess

Assessment:

•  Written Test

•  Continuous Control

•  Oral report

•  Project

•  Written Report