Fracture Mechanics

Code:

EM520

Acronym:

MECF

Instance: 2003/2004 - 2S

Active?	Yes
Responsible unit:	Applied Mechanics Section
Institution Responsible:	Faculty of Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
LEM	23	Plano de Estudos EM Oficial a partir de 2000	5	3,5	7	-
		Plano para Bachareis EM a partir 2000	2	3,5	7	-

Teaching language

Portuguese

Objectives

This discipline provides knowledge on the assessment of structural integrity of structures, in the possible presence of cracks.

Program

1. Linear Elastic Fracture Mechanics. Stress analysis of cracks. Stress intensity factor K. Energy base4d methods. Strain energy release rate, G. Relationship betweeen K and G. Mecânica da Fractura Linear Elástica. Calculation of K using the finite element method. Plastic region in the crack tip. Plane stress and plane strain. Equivalent elastic crack.
Plane strain fracture toughness KIc. ASTM E399 standard.

2. Elasto plastic fracture mechanics. Dugdale model. Crack Opening Displacement - tests and standards. A Welding Institute Design Curve. J integral. Relationship COD - J.

3. Stable crack propagation: fatigue and stress corrosion. Paris law. Fatigue threshold. Relationships between SN tests(Wohler) and fatigue crack propagation tests.

4. Fracture of composite materials
Equivalent crack and crack saturation.

5. Failure analysis. CEGB R6 criterion.

Main Bibliography

lecture notes by P. T. de Castro.
book : C M Branco, A. A. Fernandes, P. T. de Castro.
'Fadiga de Estruturas Soldadas', Fundação C. Gulbenkian, 1986, reprinted 2000,

Complementary Bibliography

to be indicated

Evaluation Type

Evaluation with final exam