COURSE UNIT TITLE

: FRACTURE AND FAILURE MECHANICS OF COMPOSITE MATERIALS

DEGREE PROGRAMMES

Description of Individual Course Units

Course Unit Code Course Unit Title Type Of Course D U L ECTS
MEE 5108 FRACTURE AND FAILURE MECHANICS OF COMPOSITE MATERIALS ELECTIVE 3 0 0 4

Offered By

Graduate School of Natural and Applied Sciences

Level of Course Unit

Second Cycle Programmes (Master's Degree)

Course Coordinator

PROFESSOR EVREN MELTEM TOYGAR

Offered to

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

Course Objective

Composite materials, which have high performance in structural applications, are used very effectively. Therefore it is necessary to develop accurate reliable predictive methods for describing their failure behavior and to have analytical representation of the individual failure modes and to understand how the physical properties of the constituents affect the fracture behavior of composite systems. The aim of this course is firstly to get the structural behavior and failure characteristics of composite materials with a cracked layer and fiber. Secondly, to calculate energy level by considering the strain energy density criterion to analyze the fracture behavior of unidirectional fiber-reinforced compositesand to understand the catastropic failure due to fiber breaking, matrix cracking and interface debonding. Thirdly, to get the structural behavior and failure characteristics of sandwich materials.

Learning Outcomes of the Course Unit

1   To develop accurate reliable predictive methods for describing their failure behavior
2   To use strain energy density criterian for composites under the slow or rapid crack extension
3   To get the characterization of the mechanical properties of laminated and face sheet and core materials
4   To get the damage models for fatique of composite materials
5   To apply the fracture mechanics to composites
6   To get the idea about the delamination growth modelling technique

Mode of Delivery

Face -to- Face

Prerequisites and Co-requisites

None

Recomended Optional Programme Components

None

Course Contents

Week Subject Description
1 Introduction to Failure Composites: strain energy density criterion; Failure of fiber, matrix or interface
2 Failure of unidirectional fiber/matrix composites
3 Failure of Angle-ply laminates: Through lamina and interlaminar (delamination) cracking
4 Impact and cracking of unidirectional composites
5 Cracks in materials possesing homogenous anisotropy
6 A finite width orthotropic body with a cenral crack; through crack in an orthotropic layer of finite height.
7 Midterm I
8 Characterization of the mechanical properties of face sheet and core materials
9 Fracture mechanics Analysis of Face /Core Debonds
10 Finite element Crack Clouse Method, Crack Kinking Analyses; Cohesive Zone Models of Face/Core Interface Failure
11 Analysis of Debond Fracture Specimens
12 Midterm II
13 Debond Fracture Testing
14 Face/Core Debond Buckling and Growth

Recomended or Required Reading

1. Textbook(s): G.C.Sih and E.P.Chen, Mechanics of Fracture : Cracks in Composite Materials, Martibus Nijhoff Publishers, 1981.
2. Supplementary Book(s):
- L.A Carlson and G.A. Kardomates, Structural Failure Mechanics of Sandwich Composites, Springer Dordrecht Haidelberg Londn New York, 2011.
References:
Materials:

Planned Learning Activities and Teaching Methods

The course is taught in a lecture, class presentation and discussion format. All class members are expected to attend and both the lecture and take part in the discussion sessions. Besides the taught lecture, group presentations are to be prepared by the groups assigned for that week and presented to open a discussion session.

Assessment Methods

SORTING NUMBER SHORT CODE LONG CODE FORMULA
1 MTE MIDTERM EXAM
2 PRJ PROJECT
3 FIN FINAL EXAM
4 FCG FINAL COURSE GRADE MTE * 0.35 + PRJ * 0.15 + FIN * 0.50
5 RST RESIT
6 FCGR FINAL COURSE GRADE (RESIT) MTE * 0.35 + PRJ * 0.15 + RST * 0.50


Further Notes About Assessment Methods

None

Assessment Criteria

There will be minimum 2 homeworks and 1 presentation, averaged out grades for which will be 15 % of the overall success of the students. mid-term examinations will be averaged and affect the grade by 35 %. Final exam will be 50 % of the resulting grade.

Language of Instruction

English

Course Policies and Rules


Examination dates should be specified in the course content given below. The examination dates can be changed later.

Contact Details for the Lecturer(s)

evren.toygar@deu.edu.tr
tel: +90 232 301 92 25

Office Hours

it will be anounced

Work Placement(s)

None

Workload Calculation

Activities Number Time (hours) Total Work Load (hours)
Lectures 12 3 36
Preparations before/after weekly lectures 12 2 24
Preparation for midterm exam 2 5 10
Preparation for final exam 1 10 10
Preparing assignments 3 3 9
Preparing presentations 1 10 10
Midterm 2 2 4
Final 1 2 2
TOTAL WORKLOAD (hours) 105

Contribution of Learning Outcomes to Programme Outcomes

PO/LOPO.1PO.2PO.3PO.4PO.5PO.6PO.7PO.8PO.9PO.10PO.11PO.12PO.13PO.14
LO.15544544544
LO.2455555545
LO.3444444433
LO.455355553555
LO.5553443454
LO.6454444445

CONTACT INFORMATION
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Phone: +90(232) 412 12 12 - Fax: +90 (232) 464 81 35

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