# COURSE UNIT TITLE

: FRACTURE MECHANICS

#### Description of Individual Course Units

Course Unit Code Course Unit Title Type Of Course D U L ECTS
MME 5003 FRACTURE MECHANICS ELECTIVE 3 0 0 8

#### Offered By

Graduate School of Natural and Applied Sciences

#### Level of Course Unit

Second Cycle Programmes (Master's Degree)

#### Offered to

M.Sc. Metallurgical and Material Engineering
Metallurgical and Material Engineering

#### Course Objective

Engineering component and structures produced according to classic design criteria have begun to face unexpected failures. After extensive investigations it was realized that some defecets found in materials, which until then were not taken into consideration in design, caused failures. Therefore, a new concept based on fracture mechanics was born. Obtaining the characteristic properties materials which control the length and propagation of cracks therefore, has got the main aim of fracture mechanics.

#### Learning Outcomes of the Course Unit

 1 Will be able to identify the cause of failure by studying photomicrograph of facture surface, 2 Will be able to calculate linear- elastic fracture toughness values of materials, 3 Will be able to calculate elastic - plastic fracture toughness of materials, 4 Will be able to predict the life of materials under cycling loading. 5 Will be able to design according to the fracture mechanics under all kinds of loadings

Face -to- Face

None

None

#### Course Contents

 Week Subject Description 1 Solution that are Useful in Fracture Phenomenon( Stress Field Around a Spherical and Eliptical Hole ), 2 Stress Field Around a Sharp Crack( Westergaard Solution), assignment. 3 Linear Elastic Fracture Mechanics( Crack Stability ), 4 Linear Elastic Fracture Mechanics( Stres Intensity Factor Relationships ), assignment. 5 Linear Elastic Fracture Mechanics( Crack Stability in Real Linear-Elastic Materials (the Mc Clintock and Dugdale Models, Effective Crack Length, Plane- Stress and Deformation ), assignment. 6 Linear Elastic Fracture Mechanics 7 Fracture Toughness Tests( Plane-Strain State, Plane-Stress State ), assignment. 8 I.Mid-term exam, 9 Elastic- Plastic Fracture Mechanicsi( CTOD Method, J Integral method ), assignment. 10 Elastic- Plastic Fracture Mechanics( CTOD Method, J Integral method ), assignment. 11 Elastic- Plastic Fracture Mechanics( CTOD Method, J Integral method ), assignment. 12 Fatigue Crack( The Initation and Propagation of Crack Under Constant Stress, Amplitude, Macroscopic and Microscopic Fracture Modes ), assignment. 13 II.Mid-term exam, 14 Crack Propagation Under AlteringStress Amplitude.

1- Course Notes,
2- Herzberg, R.W., Deformation and Fracture Mechanics, John Wiley and Sons Publication, New York, 1983,
3- Vardar Ö., Fracture Mechanics, Boğaziçi University Publication, Istanbul,1988.

#### Planned Learning Activities and Teaching Methods

Lecture, homework, midterm and final exams.

#### Assessment Methods

 SORTING NUMBER SHORT CODE LONG CODE FORMULA 1 MTE 1 MIDTERM EXAM 1 2 MTE 2 MIDTERM EXAM 2 3 ASG ASSIGNMENT 4 FIN FINAL EXAM 5 FCG FINAL COURSE GRADE ASG * 0.25 +MTE 1 +MTE 2/2 * 0.25 +FIN * 0.50

#### Further Notes About Assessment Methods

Semester requirements are 2 mid-term and final exams and homeworks

#### Assessment Criteria

Program outcomes related with the questions on the exam paper are stated

Turkish

#### Course Policies and Rules

Precipitation to the course is important and it should be min.70%.

#### Office Hours

Monday : 10.00-12.00
Friday : 9.30- 11.30

None