Publication in the Diário da República: Despacho n.º 14908/2014
6 ECTS; 1º Ano, 2º Semestre, 22,50 T + 22,50 TP + 3,50 OT , Cód. 37467.
Lecturer
- Teresa Leonor Ribeiro C. M. Morgado (2)
(1) Docente Responsável
(2) Docente que lecciona
Prerequisites
Not applicable
Objectives
Provide students with the knowledge about the problem of the existence of defects inherent to the material and
the considerations to take in the mechanical design of components, organs, structures, development of capabilities to analyze design criteria taking into account the causes of the ruin.
Program
Introduction:
Failure modes. Fracture control.
Linear elastic fracture mechanics:
Strain Energy. Stress intensity factor, plain stress and plain strain. Influence on fracture behaviour, curve R
concept. Mechanical tests, applicability domain Elastic-Plastic Fracture Mechanics.
Concept of the integral J and CTOD. Empirical curve in mechanical design. Tests limitations and applicability
domain.
Fatigue:
Initiate propagation. High number of fatigue cycles and oligocyclic fatigue. Curves SN, effect of average stress,
diagram of Goodman, Palgrem-Miner rule. Factors with influence on fatigue behaviour- Methods of improving
behaviour fatigue. Paris law.
Creep:
Factors that influence the creep behaviour. Types of tests.
Forecast of life under creep. Orr-Sherby-Dorn parameter. Larsson-Miller parameter. Accelerated creep tests.
Fitness for service concept
Fitness for service FfS". Control of the fracture. Diagram of fault assessment, FAD. Fatigue.
Evaluation Methodology
Theoretical and practical work with 60% for the written report and 40% for the presentation and defense.
Bibliography
- Branco, C. (1985). MECÂNICA DOS MATERIAIS. : Fundação Calouste Gulbenkian
- Morozov, N. (2000). DYNAMICS OF FRACTURE. : Springer
- Wulpi, D. (1999). UNDERSTANDING HOW COMPONENTS FAIL. : ASM
Teaching Method
Lectures will describes and illustrates the application of fundamental principles. Solve practical cases will be propose in theoretical and practical classes.
Software used in class
SolidWorks, Office (Word, Excel, PowerPoint, etc.), Matlab.
