Metodika stanovení smykového modulu textilií s využitím mechaniky kontinua
Title Alternative:Method of determination of shear rigidity of fabrics by using of mechanics of continuum
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Date
2008
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Publisher
Technická Univerzita v Liberci
Abstract
Cieľom tejto práce je vytvoriť novú metodiku na získanie šmykového modulu textílie. Predkladá postup získania hodnôt potrebných k samotnému výpočtu šmykového modulu pomocou mechaniky kontinua a jednosého namáhania. Textília je jednooso namáhaná na Instronu len do určitého predľženia a pomocou kamery boli sledované posuvy bodov vyznačených na textílii. Jednou píšete v minulém čase podruhé v přítomném, pište jen v jednom. Asi by byl nejleší použít čas přítomný. Filmový obraz, rozdelený na sled fotografií poslúži k získaňiu súradníc bodov. Data z Instronu (sila a predľženie) priradíme k fotografiám, ktorým odpovedajú súradnice bodov. Samotný výpočet je realizovaný pomocou mechaniky kontinua. Za pomoci jednotlivých tenzorov sa stanový hodnota odpovedajúca modulu v šmyku G.
The main aim of the thesis is to prepare a complex method for measuring and calculation shear modulus of fabrics. The thesis is divided to three parts. The first part deals with available methods for obtaining shear rigidity values. The second part describes the procedure and equations for obtaining values, which are necessary for caltulation of the shear modulus. The procedure is based on mechanics of continuum and uniaxial stress. The fabric has been uniaxially stressed by using Instron to a certain extent. The shift of four marks on the fabrics has been watched by using a digital camera. The movie has been divided into a sequence of pictures, it helped to gather coordinates of the marks (points). Data from Instron (stress and strength) accompanies pictures, on which point coordinates are. The calculation has been realized by using mechanics of continuum. The value representing G shear modulus has been determined by using the individual tensors.
The main aim of the thesis is to prepare a complex method for measuring and calculation shear modulus of fabrics. The thesis is divided to three parts. The first part deals with available methods for obtaining shear rigidity values. The second part describes the procedure and equations for obtaining values, which are necessary for caltulation of the shear modulus. The procedure is based on mechanics of continuum and uniaxial stress. The fabric has been uniaxially stressed by using Instron to a certain extent. The shift of four marks on the fabrics has been watched by using a digital camera. The movie has been divided into a sequence of pictures, it helped to gather coordinates of the marks (points). Data from Instron (stress and strength) accompanies pictures, on which point coordinates are. The calculation has been realized by using mechanics of continuum. The value representing G shear modulus has been determined by using the individual tensors.
Description
katedra: KTT; přílohy: 1 skript, 1 CD;; rozsah: 58 s., 12 s. obr., tab.,příloh
Subject(s)
textilie - tkanina, jednoosé namáhání textilií, mechanika kontinua, smykový modul textilie, tenzor, fabrics, uniaxial stress of fabrics, mechanics of continuum, shear rigidity, shear modulus