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Thursday, January 3, 2013

TT2023 MECHANICS OF TEXTILE STRUCTURES SYLLABUS | ANNA UNIVERSITY BTECH TEXTILE TECHNOLOGY 6TH SEMESTER SYLLABUS REGULATION 2008 2011 2012-2013

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TT2023 MECHANICS OF TEXTILE STRUCTURES SYLLABUS | ANNA UNIVERSITY BTECH TEXTILE TECHNOLOGY 6TH SEMESTER SYLLABUS REGULATION 2008 2011 2012-2013 BELOW IS THE ANNA UNIVERSITY SIXTH SEMESTER B.TECH TEXTILE TECHNOLOGY DEPARTMENT SYLLABUS, TEXTBOOKS, REFERENCE BOOKS,EXAM PORTIONS,QUESTION BANK,PREVIOUS YEAR QUESTION PAPERS,MODEL QUESTION PAPERS, CLASS NOTES, IMPORTANT 2 MARKS, 8 MARKS, 16 MARKS TOPICS. IT IS APPLICABLE FOR ALL STUDENTS ADMITTED IN THE YEAR 2011 2012-2013 (ANNA UNIVERSITY CHENNAI,TRICHY,MADURAI, TIRUNELVELI,COIMBATORE), 2008 REGULATION OF ANNA UNIVERSITY CHENNAI AND STUDENTS ADMITTED IN ANNA UNIVERSITY CHENNAI DURING 2009

TT2023 MECHANICS OF TEXTILE STRUCTURES L T P C
3 0 0 3
AIM
To study the fundamentals of mechanics of textile structures.
OBJECTIVE
 To impart the fundamental knowledge about yarn geometry, fibre migration,
mechanics of staple-fibre and filament yarns, and fabric geometry related issues
concerning textile structures.
UNIT I YARN GEOMETRY 9
Basic geometry of twisted yarn – The idealized helical yarn structure. Yarn count and
twist factor. Twist contraction and theoretical calculations. Limits of twists. Real and
idealized yarns. Packing of fibres in yarn – Idealized packing – Derivations from ideal
forms of packing. Packing in actual yarns. Specific volume of yarns. Relation between
Twist, Diameter and Twist Angle.
UNIT II FIBRE MIGRATION 9
Ideal migration – Observation of the paths of individual fibres – Migration in spun yarns.
Characterisation of migration behaviour – Tension variation as a mechanism of migration
– Criteria for interchange of position – Theory of migration – Conditions for migration and
frequency of migration. Forms of yarn twisting – Cylindrical and Ribbon twisting.
68
UNIT III MECHANICS OF STAPLE FIBRE YARNS 9
Theoretical analysis of yarn geometry – Stress-strain distribution in yarn – Fibre obliquity
and slippage – Influence of fibre length, fineness and friction on fibre slippage and yarn
strength – Yarn breakage. Strength of blended yarns – Hamburger's model. Analysis of
tensile behaviour, Prediction of breakage, Analysis of yarn mechanics by energy
method, Observed extension and breakage of staple fibre yarns.
UNIT IV MECHANICS OF FILAMENT YARNS 9
Theory of extension of continuous filament yarns, Analysis of tensile forces, Stress-strain
relations of the filaments, Effects of large extensions, Filament behaviour at large
extensions, Prediction of breakage, Load-Extension curve near break, Tenacity,
Breaking extension, Initial modulus, Work of rupture.
UNIT V FABRIC GEOMETRY AND DEFORMATION 9
Elements of woven fabric geometry, Peime and Olofsson models. Jamming of threads,
cover factor, crimp interchange in woven fabrics. Modification to Pierce model – Race
track, Saw tooth and Bilinear models. Form factor, degree of set, extension behaviour of
woven fabric, prediction of modulus, tensile properties in bias direction. Geometry of
plain knitted structures, mechanics of nonwoven fabrics.
TOTAL : 45 PERIODS
TEXT BOOKS
1. J.W.S. Hearle, P. Grosberg and S. Backer, Structural Mechanics of Fibres, Yarns
and Fabrics, Wiley-Interscience, New York, 1969.
2. B.C. Goswami, J. Martindale and Scandio, Textile Yarns: Technology, Structure and
Application, Wiley-Interscience, New York, 1977.
REFERENCES
1. J.W.S. Hearle, J.J. Thwaites and J. Amirbayat, Mechanics of Flexible Fibre
Assemblies, Marryland, 1980.
2. R. Postle, S. De Jong and G.A. Carnaby, The Mechanics of Wool Structures, Ellis
Horwood, 1988.

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