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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.

ECTS credits

Teaching Language

italiano

Exam Language

italiano

Support Materials Language

italiano

Basic Learning Outcomes

Managing Entity (faculty)

Department of Civil and Mechanical Engineering (UNICAS)