Code: | EM0067 | Acronym: | FMF |
Keywords | |
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Classification | Keyword |
OFICIAL | Applied Mechanics |
Active? | Yes |
Responsible unit: | Applied Mechanics Section |
Course/CS Responsible: | Master in Mechanical Engineering |
Acronym | No. of Students | Study Plan | Curricular Years | Credits UCN | Credits ECTS | Contact hours | Total Time |
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MIEM | 35 | Syllabus since 2006/2007 | 5 | - | 6 | 45,5 | 162 |
This course aims to acquaint students with concepts and techniques for the structural integrity assessment of mechanical constructions in the presence of cracks. The course is relevant for the design of equipment taking into account fatigue and for the interpretation of the causes of structural failure (“failure analysis”). By the end of the semester, students should be capable of:
- selecting procedures to assess the structural integrity of mechanical components, structures, and structural connections with cracks;
- coordinating the analysis of the causes by fracture and fatigue in real cases;
- to understand the relevant technical literature, including standards, codes, and parts of standards and of codes associated with fracture and fatigue.
- select procedures to and carry out the assessment of the structural integrity of mechanical components, structures, and structural connections with cracks;
- coordinate the analysis of the causes by fracture and fatigue in real cases;
- to understand the relevant technical literature, namely technical papers, standards, codes, and parts of standards and of codes associated with fracture and fatigue.
Knowledge and particular liking for the subjects: solid mechanics, theory of elasticity, and finite elements method.
1. Linear elastic fracture mechanics; stress analysis of cracks; concept of stress intensity factor, K; energy methods; concept of strain energy release rate G; Relations between K and G; plastic region in crack tips; state of plane stress and plane strain; equivalent elastic crack; plane strain fracture toughness KIC; ASTM E339 standard; resistance R-curve and stable propagation of cracks; experimental toughness measurement; 2. Elasto-plastic fracture mechanics; Dugdale’s method; crack opening displacement COD - tests and standards; The Welding Institute (TWI) design curve; Relationship between J-integral and COD; 3. stable crack propagation: fatigue and stress corrosion cracking; Paris’ law; concept of threshold for crack propagation; relationship between SN tests (Wohler) and fracture mechanics tests; 4. Application of fracture mechanics to composite material; 5. Failure analysis; CEBG R6 procedure; 6. Computational fracture mechanics; calculation of J integral, strain energy release rate and stress intensity factor.
Lectures; tutorials; combined lectures and tutorials; sessions in PC rooms; visit to lab. .
Designation | Weight (%) |
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Exame | 100,00 |
Total: | 100,00 |
Designation | Time (hours) |
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Frequência das aulas | 50,00 |
Estudo autónomo | 110,00 |
Total: | 160,00 |
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The course final mark will be based on the final exam. The quality of the assignments and students’ assiduity may be taken into account.
Students will be encouraged to do assignments.
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This course can be taught in English if this is justified by a significant number of non-Portuguese speaking students. However, course will be in English only if the Portuguese students do not oppose the use of a foreign language.