COURSE UNIT TITLE

: FIBRE AND YARN MECHANICS

Description of Individual Course Units

Course Unit Code Course Unit Title Type Of Course D U L ECTS
TKS 5001 FIBRE AND YARN 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)

Course Coordinator

PROFESSOR GÜNGÖR BAŞER

Offered to

Textile Engineering
M.Sc. Textile Engineering

Course Objective

The course aims,at first, giving a deeper understanding the elastic properties of textile fibres.In the introduction of the geometric and elastic properties of yarns to students, the concept of theorical model is explained ,first, and then it will be shown how these properties can be predicted from the fibre properties by appliying analytical methods.

Learning Outcomes of the Course Unit

1   Ability to understand how theoretical models are developed and verified in the course of a complete research cycle.
2   Ability to understand fine structure of textile fibers and their elastic properties.
3   Ability to understand the relationship between external forces and deformations of fibers and yarns.
4   Ability to understand the geometric structure of yarns and its practical importances.
5   Ability to understand the relationship between twist and yarn mechanical behaviour.
6   Ability to understand the tensile and bending behaviour of yarns.

Mode of Delivery

Face -to- Face

Prerequisites and Co-requisites

None

Recomended Optional Programme Components

None

Course Contents

Week Subject Description
1 An introduction to scientific research methods and development of a theoretical model.Fine structure of fibers and its relation to elastic behaviour.
2 An outline of General theory of elasticity. Analysis of stress. Relationship between stress and strain. Elastic constants for fibres.
3 Load-Extension diagram for fibres. Basic definitions and units related to extension of fibres. Recovery from extension.Creep and relaxation curves. Effect of time on the tensile behaviour of fibres.Tensile testing methods.
4 Simple bending of bars. Bending moment. Euler- Bernouilli Equation.Moments of inertia of sectional areas.
5 Derivation of the formula of bending rigidity for fibres. Measurement of bending rigidity of fibres. Bending properties of fibres. Factors affecting bending rigidity of fibres.
6 Torsional properties of fibres. Derivation of a formula for the modulus of torsional rigidity. Measurement of modulus of torsional rigidity of fibres. Torsional properties of fibres.
7 Midterm
8 Theories of friction. Laws of friction for fibres. Measurement of friction of fibres. Dynamic friction. Frictional properties of fibres. Directional frictional effect.
9 Yarn geometry. Effect of twist on yarn geometry. Yarn flattening.
10 Fiber migration and its effect on yarn geometry.
11 Packing of fibers in yarn cross-section. Twist models.
12 Tensile properties of yarns: Small extensions.
13 Tensile properties of yarns: Large extensions.
14 Yarn breakage mechanisms.

Recomended or Required Reading

- Tekstil Mekaniği Temelleri Cilt 1: Lif ve Iplik Mekaniği, Prof. Dr. Güngör Başer, DEÜ Mühendislik Fakültesi Basım Ünitesi, 2008
- Physical Properties of Textile Fibres,Morton,W.E.,Hearle,J.W.S.,The Textile Institute,Manchester, 1975
- Structural Mechanics of Yarns and Fabrics Volume I, Hearle,J.W.S.,Grosberg,P.,Backer,S.,Wiley Interscience,1969

Planned Learning Activities and Teaching Methods

Presentation + Problem solving

Assessment Methods

SORTING NUMBER SHORT CODE LONG CODE FORMULA
1 MTE MIDTERM EXAM
2 FIN FINAL EXAM
3 FCG FINAL COURSE GRADE MTE * 0.50 + FIN * 0.50
4 RST RESIT
5 FCGR FINAL COURSE GRADE MTE * 0.50 + RST * 0.50


Further Notes About Assessment Methods

None

Assessment Criteria

MIDTERM(%50)+FINAL EXAM(%50)

Language of Instruction

English

Course Policies and Rules

The course aims to give the students a deeper understanding of fiber and yarn structure and how structural properties affect their mechanical behaviour. Yarn behaviour is modeled on a geometrical-mechanical description and mathematical methods of analysis are applied. The practical implications are noted.

Contact Details for the Lecturer(s)

Dokuz Eylül Üniversitesi
Mühendsilik Fakültesi
Tekstil Mühendisliği Bölümü
Tınaztepe Kampüsü, 35160, Buca-Izmir
Tel:0232 3017704
e-posta: gungor.baser@deu.edu.tr

Office Hours

To be announced.

Work Placement(s)

None

Workload Calculation

Activities Number Time (hours) Total Work Load (hours)
Lectures 13 3 39
Reading 13 2 26
Preparation for midterm exam 1 30 30
Preparation for final exam 1 40 40
Preparations before/after weekly lectures 13 4 52
Midterm 1 2 2
Final 1 2 2
TOTAL WORKLOAD (hours) 191

Contribution of Learning Outcomes to Programme Outcomes

PO/LOPO.1PO.2PO.3PO.4PO.5PO.6PO.7PO.8PO.9PO.10
LO.15555554355
LO.22534354345
LO.35555555345
LO.45555535345
LO.55555534355
LO.65555534355