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Politecnico di Torino
Academic Year 2015/16
06JWLNE, 06JWLMZ
Materials mechanics /Mechanical metallurgy
Master of science-level of the Bologna process in Mechanical Engineering - Torino
Master of science-level of the Bologna process in Materials Engineering - Torino
Teacher Status SSD Les Ex Lab Tut Years teaching
Matteis Paolo ORARIO RICEVIMENTO A2 ING-IND/21 20 10 0 1.5 7
Rossetto Massimo ORARIO RICEVIMENTO PO ING-IND/14 35 6 9 0 11
SSD CFU Activities Area context
ING-IND/14
ING-IND/21
5
3
B - Caratterizzanti
C - Affini o integrative
Ingegneria meccanica
A11
Subject fundamentals
The subject aims to illustrate the fundamental concepts and the principal applications of the mechanical behaviour of materials up to the conditions that lead to failure of structural components, both under static and alternate loads. Fracture mechanics (linear and elastoplastic) and metal fatigue are presented in depth with regard to the possible interplay between component design and material selection to avoid failures under load. The most used methods of Non Destructive Testing are exposed to arrive to the concepts of Non Destructive Evaluation. Also the main methods of analysis of failure are presented.
The course is offered in the "Mechanical design" elective curriculum of the MSc in Mechanical Engineering and among the electives recommended by the Faculty of MSc Programme in Material Engineering.
Expected learning outcomes
Knowledge of the characteristics and behaviour of structural materials: linear-elastic and elastic-plastic fracture mechanics, stress-corrosion, fatigue in control of stress, strain and very high cycles fatigue, complex multi-axial fatigue.
Basic knowledge of methods for failure analysis.
Knowledge of the main non-destructive testing methods
Ability to use advanced knowledge on the behaviour of materials within the design process.
Ability to define the controls in production or work necessary to preserve the structural integrity of mechanical components.
Ability to analyze failures by identifying the cause and suggesting ways to avoid them.
Prerequisites / Assumed knowledge
Basic knowledge of strength of material and basic metallurgy (especially heat treatment).
Contents
Remainders of stress and strain state and on fracture criteria, collapse modes of materials, fractography. Elastic and plastic stress concentration factors.
Linear Elastic Fracture Mechanics (LEFM): energy approach; strain energy release rate (G); stress and strain field at the tip of a crack; stress intensity factor (K); fracture toughness (GIc e KIc); plastic deformation at the crack tip; competition among collapse modes.
Standard fracture toughness tests.
Fracture toughness controlling parameters. Ductile-to-brittle fracture transition. Fracture toughness of various materials as a function of heat-treatments and fabrication processes.
Crack propagation resistance curves (R-curves).
Elasto-plastic fracture mechanics (EPFM), crack tip blunting; COD-CTOD and engineering design curves, J-integral.
Elements of stress-corrosion fracture mechanics.
Non destructive tests and evaluation. Defect categorization.
Fatigue fracture mechanics; Paris relationship, Load interaction: retardation . Macro- and micro-scopic characteristics of a fatigue crack, fatigue micromechanisms. Corrosion-fatigue.
High Cycles Fatigue (HCF): SNP diagrams, standard tests for fatigue curves determination.; mean stress effect; samples to components results transfer. Parameters influencing fatigue life; notch effect. Critical Distance Method.
Very High Cycles Fatigue (VHCF); SN duplex and double slope curves; ultrasonic testing machines; nucleation micromechanisms.
Low Cycle Fatigue (LCF): Strain controlled tests, Manson Coffin Equation; mean stress effect; two stages approaches.
Non–constant amplitude load histories: counting methods, Cumulative damage hypothesis. Gassner Curves and Locati method; Miner’s rule for strain controlled fatigue; Paris relationship for variable load histories.
Multi-axial: classic and critical plane approaches. Mesoscopic approach
Delivery modes
Drill exercises compiled by the students in the class room in self-controlled mode,
Laboratory experiences: Fractographic analysis and macroanalysis of rupture surfaces; Optical and Scanning Electron Microscopy; Fracture toughness tests (KIc e JIc); Non Destructive Tests.
Texts, readings, handouts and other learning resources
M. Rossetto - Introduzione alla fatica dei materiali e dei componenti meccanici - Levrotto & Bella, Torino
Further reading will be advised by the instructors.
Assessment and grading criteria
The exam consists in an oral test aimed at evaluating the knowledge on mechanical behavior of materials and the capability to use such competences in the design and in the production process as well in the failure analysis, also availing oneself of control techniques.

Programma definitivo per l'A.A.2015/16
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