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Lecturer(s)
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Neckář Bohuslav, prof. Ing. DrSc.
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Vyšanská Monika, Ing. Ph.D.
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Mertová Iva, Ing. Ph.D.
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Krupincová Gabriela, Ing. Ph.D., Ing.Paed.IGIP
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Course content
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Lectures: 1. Introduction to structural mechanics. Basic terms of mechanics, solid and deformable bodies, principles of continuum and structural mechanics. 2. Fibers and fiber assemblies 1. Basic quantities and relations (fiber fineness, cross-section, equivalent diameter, shape factor; packing density and its interpretation). 3. Fibers and fiber assemblies 2. Fiber orientation - description of fiber orientation in 3D and in section, model of fiber orientation in plane. 4. Fibers and fiber assemblies 3. Fiber-to-fiber contacts. Theory of contacts according to C.M. Wyk, distribution of contacts in the case of isotropic orientation of fibers in the plane. 5. Fibers and fiber assemblies 3. Mechanics of fiber assemblies. Compression of fibrous material, model according to C.M. Wyk and its empirical correction. 6. Fiber bundles. Axial straining of parallel fiber bundles. 7. Yarns 1. Definition, basic terms and relations (fineness, substance cross-section and diameter, number of fibers in cross-section, coefficient kn and twist factors. 8. Yarns 2. Axial tensioning of yarns, yarn strength and gauge length, principle of weakest link, Peirce's model of relation of yarn strength and gauge length, independent strength with Weibull's distribution. 9. Multiaxial textiles. Tensioning of multiaxial textiles, regular multiaxial textiles, textiles with continual distribution of fiber directions. 10. Woven fabrics 1. Definition, basic terms and relations, fabric's model according to Peirce's theory. 11. Woven fabrics 2. Mechanics of fabrics - strength and breaking strain by non-deformable yarns. 12. Woven fabrics 3. Mechanics of fabrics - strength and breaking strain by deformable yarns, yarn deformations in woven fabrics. 13. Knitted fabrics 1. Definition, basic terms and relations, simple fabric's model of loop of weft fabric according to Dalidovic. 14. Knitted fabrics 2. Mechanics of fabrics - strength and breaking strain by non-deformable and deformable yarns. Practices: 1. Basic quantities and relations describing fibers and fiber assemblies. 2. Fibers and fiber assemblies - packing density and its interpretation. 3. Fibers and fiber assemblies - evaluation of fiber orientation in 2D and 3D models. 4. Fibers and fiber assemblies - relations of contacts according C.M.Wyk. 5. Bundles - Prediction of bundle strength. 6. Yarns - determination of basic parameters of yarns. 7. Yarns - method for determination of stress and strength in tensioned yarn. 8. Woven fabrics - basic quantities and relations describing a woven fabric. 9. Woven fabrics - prediction of length of yarn in fabrics according to Peirce's model. 10. Woven fabrics - prediction of limit levels of fabric according to Peirce's model. 11. Woven fabrics - prediction of strength and breaking strain of fabric by non-deformable yarns. 12. Knitted fabrics - calculation of the simple model of warp-knitted fabrics, prediction of limit levels. 13. Knitted fabrics - method for determination of stress and strength in tensioned warp-knitted fabrics. 14. Final test.
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Learning activities and teaching methods
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Monological explanation (lecture, presentation,briefing), Dialogue metods(conversation,discussion,brainstorming), Lecture, Practicum, Students' self-study
- Class attendance
- 56 hours per semester
- Home preparation for classes
- 40 hours per semester
- Preparation for comprehensive test
- 30 hours per semester
- Preparation for exam
- 45 hours per semester
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Learning outcomes
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Students will be acquainted with quantities and relations which are valid in textile fiber assemblies: fiber blends, fiber bundles, linear fiber assemblies - multifilaments and yarns, and areal textiles - woven and knitted products. Within practices - students rearrange resulting equations from lectures to the suitable physical dimensions, apply it, and so they obtain the image about order of values of quantities. Students obtain also other information about technological relations.
Deeper ability to understand behavior of fiber structures and ability for utilization of their specific properties.
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Prerequisites
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Knowledge of mathematics, mechanics, basic principles of textile structure, and textile technologies within the range of forgoing study program.
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Assessment methods and criteria
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Oral exam
Direct Teaching: Credit: Active participation in practices and lectures, passing a test of knowledge during the semester. Exam: oral Indirect Teaching: Credit: Correctly calculated all sent examples. Exam: oral on-line.
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Recommended literature
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Soubor českých přednášek na https://elearning.tul.cz/..
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BEHERA, B. K., HARI, P. K., ed. Woven textile structure. Cambridge: Woodhead, 2010. ISBN 978-1-84569-514-9.
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HU, J. Structure and mechanics of woven fabrics. Cambridge: Woodhead Publishing, 2004. ISBN 0-8493-2826-8.
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NECKÁŘ. B., DAS. D. Theory of structure and mechanics of fiber assemblies. New Delhi: Woodhead Publishing India, 2012. ISBN 978-1-84569-791-4.
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NECKÁŘ. B., DAS. D. Theory of structure and mechanics of yarns. New Delhi: Woodhead Publishing India,, 2018.
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NECKÁŘ, B. Morfologie a strukturní mechanika obecných vlákenných útvarů.. Liberec: Technická univerzita v Liberci, 1989. ISBN 80-7083-318-1.
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NECKÁŘ, B. Příze. Tvorba, struktura, vlastnosti. Praha: SNTL Praha, 1990. ISBN 80-03-00213-3.
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