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Machines Construction

30341

Description

Course Program

1. CONTENTS

Introduction to Failure Mechanisms in Metals and Alloys;
High-Cycle Fatigue;
- Recalls;
- Random and multiaxial fatigue;
- Load spectra and cumulative damage criteria.
Low-Cycle Fatigue:
- Mechanism;
- Cyclic behavior of materials;
- Hardening, softening, ratcheting;
- Stabilized curve;
- Life diagrams;
- Neuber’s criterion for notched components;
- Mean stress–mean strain effect.
Brittle Fracture:
- Cleavage failure mechanism;
- Linear elastic fracture mechanics;
- Energy-based and stress-based approaches;
- Edge effects;
- K-dominance;
- Sizing of defective components;
- Elastic–plastic fracture mechanics;
- HRR field;
- J-integral;
- J-dominance;
- Resistance curve;
- Tearing modulus;
- CTOD criterion.
Fatigue in Defective Components: Paris’ law.
High-Temperature Design:
- Creep;
- Mechanisms;
- Ashby diagrams;
- Phenomenology;
- Semi-empirical and dislocation-based physical models;
- Mechanical and thermal acceleration methods for reduced-duration tests;
- Larson–Miller parameter;
- Creep under multiaxial stress conditions;
- High-Temperature Fatigue;
- Creep–fatigue interaction;
- Total strain range partitioning method.
Mechanical Components
- Stress states in axisymmetric solids;
- Discs and pressure vessels;
- Bottom-shell junction;
- Design of rapidly rotating discs and shafts;
- Design of high-temperature pressure vessels.

2. KNOWLEDGE

Knowledge of main failure modes of materials, mechanisms, and relations for service life estimation;
Knowledge for determining stress states in simple geometries.

SKILLS

Ability to estimate the level of structural integrity of a mechanical component.

Crédits ECTS

Langue d'enseignement

italiano

Langue d'examen

italiano

Langue des supports pédagogiques

italiano

Acquis d'apprentissage fondamentaux

Acquis d'apprentissage terminaux

Catégorie de cours

Entité de gestion (faculté)

Department of Civil and Mechanical Engineering (UNICAS)