Fracture Mechanics
Instance: 2006/2007 - 2S
Cycles of Study/Courses
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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