Course teached as: B024607 - COMPORTAMENTO DEI MATERIALI STRUTTURALI Second Cycle Degree in MECHANICAL ENGINEERING Curriculum PROGETTAZIONE
Teaching Language
Italian
Course Content
In the course the main notions concerning the structure of metals and their alloys are presented, with particular reference to the mechanical properties
F.Pratesi: Microstruttura e proprietà meccaniche dei materiali. Aracne. ISBN 978-88-548-2163-7
N.E.Dowling: Mechanical Behavior of Materials. Prentice Hall
Ashby M.F.-Materials Selection in Mechanical Design (4ed). Butterworth-Heinemann
G.E.Dieter - Mechanical Metallurgy. McGraw-Hill
L.Vergani: Meccanica dei materiali. McGraw-Hill
Learning Objectives
The course aims at giving the fundamental knowledge for selecting metallic materials in mechanical applications, in order to guarantee the best performance. With this purpose, the relations between mechanical properties and microstructural characteristics are described.
Teaching Methods
Classroom lectures and exercises
Type of Assessment
Oral examination
Course program
Material selection in mechanical design
Role of material in design, material property charts, material performance indices and selection procedure
Crystal structures
Metallic crystal systems, crystallographic points, directions and planes, close-packed crystal structures, point defects, plastic strain and slip systems, edge and screw dislocations, Burgers vector, motion of dislocation, energy and stress fields, dislocation multiplication, twinning, grain boundaries
Metal alloys
Solid solutions, phase diagrams, work hardening, strengthening of metals by solid solution, particle hardening, strain aging, oxide dispersion
Creep
Phenomenology, presentation of engineering data, deformation mechanisms, constitutive equations, models of linear viscoelasticity, relaxation, time-temperature parameters
Low cycle fatigue
Cyclic behaviour, Manson-Coffin and Basquin relations, high temperature low cycle fatigue, life prediction methods, creep-fatigue interaction, strainrange partitioning