Eva Zajícová Technical University of Liberec

1. Ještěd – 1012 m Eva Zajícová Technical University of Liberec Eva Zajícová, KAM, FM, TU Liberec

2. The theatre The museum The town hall Eva Zajícová, KAM, FM, TU Liberec

3. Technical University of Liberec Eva Zajícová, KAM, FM, TU Liberec The university consists of six faculties: • Faculty of Mechanical Engineering (1953) • Faculty of Textile Engineering (1953) • Faculty of Education (1990) • Faculty of Economics (1992) • Faculty of Architecture (1994) • Faculty of Mechatronics and Interdisciplinary Engineering Studies (1995)

4. Faculty of Mechatronics • department of electronics and signal processing • laboratory of computer speech processing • department of software engineering -laboratory of robotics • department of electrical engineering • department of measurement -laboratory of diagnostics and signal processing • department of control engineering • department of modelling of processes • department of applied informatics • department of electromechanical systems Eva Zajícová, KAM, FM, TU Liberec

5. Department of Measurement • analog and digital measurement instruments • automated digital measuring systems • computer control of experiment and measurement process • digital signal processing applications • technical diagnostics • measurement of electric and non-electric quantities • optical measurement methods - laser anemometry, visualization, interferometry • computer image processing • photonics Eva Zajícová, KAM, FM, TU Liberec

6. Prof. Jaroslav Nosek, M.Sc., Ph.D. Coordinator for the study stay in abroad (in Ensait) Director of ICPR Professor of physics Deptartment of Electrical Engineering and Electro-mechanical Systems Technical University of Liberec ICPR - the International Center for Piezoelectric Research has been established as a research center of the University with the additional aim to provide a contact milieu of industrial companies involved in the development and production of electromechanical materials and devices. ICPR will be glad to consider and perform research for organisations involved in the production of piezoelectric materials or electromechanical devices. http://www.fm.vslib.cz/htm/fakulta/icpr.htm Eva Zajícová, KAM, FM, TU Liberec

7. My doctoral thesis the methods of the measurement of forces in oblique cut fabrics for uniaxial deformations Eva Zajícová, KAM, FM, TU Liberec • The creation of mathematical model for the evaluation of the dimensions of forces – not weaved (one plane warp, one plane weft) • The project of the measuring method for the acting forces in the fabrics • The measurement of tensile and shear forces in the fabrics with the ‘ordinary’ weave • The measurement of oblique cut fabrics in the full spectrum of angles (0° - 90°) • The graphic of processing of signals from sensors

8. Calculation of elongation threads εo and εu where: l – the length of theard d – the length of sample x – the width of sample εo - elongation warp threads εu - elongation weft threads εt – elongation the fabric Eva Zajícová, KAM, FM, TU Liberec

9. For warp thread: For weft thread: where: E - Young’s modulus S - thread area. εt – elongation the fabric a - width of the fabric b - distance of threads Eva Zajícová, KAM, FM, TU Liberec Determination of forces in warp and weft threads and number of threads on given with of fabric

10. Acting forces in horizontal and vertical direction When: sin 4 α = 1 then Fs is max sinα = 0 or α = 90° then Ft is max Ft max is 4 times greater then Fs max In real fabric the force is a little bit lower because there will be acting for example a way of interlacing threads, it is structure of fabrics. Eva Zajícová, KAM, FM, TU Liberec

11. How measure the shear force? Eva Zajícová, KAM, FM, TU Liberec • Unfasten one jaw to provide her horizontal variation • Put the jaw on the metal strips –the dimension and the number of strips is given the dimensions of the tensile force (the strips mustn't be plastic deformed) • Put the sensor (tensometer) at the jaw and scan the horizontal variation

12. Shear force Tensile force Relation between average shear force and elongation Relation between average tensile force and elongation Eva Zajícová, KAM, FM, TU Liberec The measurement of tensile and shear force for the samples of fabrics 0°- 90°

13. The project goals Eva Zajícová, KAM, FM, TU Liberec • Find the optimum possibility how to measure the shear force, without losing any force (the force, which is used on the friction) • The measurement of the tensile and shear forces directly on the tested fabrics is ideal, because it doesn‘t have the problems with the transfer forces • The measurement of the tensile and shear forces at the same moment has the same sampling rate by both sensors • The elementary data processing

14. My work – in Ensait The former work in GEMTEX was on the characterization of the monofilament and the multifilament. Our idea is to find the relationship between the monofilamentand the multifilament. Therefore is the need: • Find the ideal speed on the testing of samples (for the fibers and the yarns) • Find the optimum length of sample (according to the possibilities the machine) • Find if the twist affect the process or no Eva Zajícová, KAM, FM, TU Liberec

15. The measurement of title and diameter Polypropylene • for one fibre: title - 23,19 dtex diameter – 58,5 μm • for yarn: title - 185,5 tex diameter – 523,24 μm Polyester • for one fibre: title – 21,06 dtex diameter – 50,4 μm • for yarn: title – 168,5 tex diameter – 450,836 μm Eva Zajícová, KAM, FM, TU Liberec

16. Eva Zajícová, KAM, FM, TU Liberec The measurement of fibers with the constant speed

17. Eva Zajícová, KAM, FM, TU Liberec The measurement of polypropylene yarns with the different twist

18. Eva Zajícová, KAM, FM, TU Liberec The measurement of polyester yarns with the different twist

19. More information is on website: www.douillet.info/~zajicova Eva Zajícová, KAM, FM, TU Liberec