Fracture Mechanics

Code:

EM520

Acronym:

MECF

Instance: 2006/2007 - 2S

Active?	Yes
Web Page:	yo be indicated. (it is suggest to look at www.fe.up.pr/~ptcastro/ to see url's of previous editions of this course).
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	3	Plano de estudos de transição para 2006/07	5	7	7	-
MIEM	16	Plano de estudos de transição para 2006/07	5	-	7	-

Teaching language

Portuguese

Objectives

This discipline provides knowledge on the assessment of structural integrity of structures, in the possible presence of cracks.
Fracture Mechanics is relevant (i) at the design stage, in order to take into account some typical damage mechanisms, as well as (ii) in order to explain the causes of failures that do occur (failure analysis stage).

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.

Mandatory literature

Ewalds, H. L.; Fracture mechanics
Broek, David; Elementary engineering fracture mechanics. ISBN: 90-247-2656-5
Branco, Carlos Augusto Gomes de Moura; Fadiga de estruturas soldadas
Knott, John; Fracture mechanics. ISBN: 0-901716-28-6
Anderson, T. L.; Fracture mechanics. ISBN: 0-8493-4277-5

Complementary Bibliography

Sanford, R. J. 340; Selected Papers on Crack Tip Stress Fields. ISBN: 0-912053-56-9
Sanford, R. J. 340; Selected Papers on Foundations of Linear Elastic Fracture Mechanics. ISBN: 0-912053-55-0

Software

Ansys 5.7

Evaluation Type

Evaluation with final exam

Assessment Components

Description	Type	Time (hours)	Weight (%)	End date
Subject Classes	Participação presencial	56,00
examination	Exame	3,00		2007-07-20
	Total:	-	0,00

Amount of time allocated to each course unit

Description	Type	Time (hours)	End date
	Estudo autónomo	130	2007-06-11
	Total:	130,00

Eligibility for exams

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Calculation formula of final grade

Final grade is based upon the performance in the examination.
When that might be favourable to the student, decision on final grade is supported by the quality of reports submitted during the course, as well as by attendance of lectures.

Examinations or Special Assignments

Students are encouraged to write reports on topics to be proposed during the course.
Interest in this activities will be taken into account in the final mark.

Special assessment (TE, DA, ...)

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Classification improvement

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Observations

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