Measurement of the Modulus of Dynamic Elasticity of Staple Fibers

Weyland, H.G.

doi:10.1177/004051756103100708

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…To clear the change of tensile property by water treatment, the tensile modulus of the ramie fibers with and without water treatment are shown in Figure 2. The tensile modulus of blank ramie fiber shown in Figure 2 is almost equal to that reported in previous papers 22, 23. On the other hand, the tensile modulus of the ramie fiber with water treatment is twice as high as that of blank ramie fiber.…”

Section: Resultssupporting

confidence: 82%

Thermal conductivity of ramie fiber drawn in water in low temperature

Yamanaka

Abe

Tsutsumi

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:To understand the effect of extension of molecular chain in amorphous region in polymer fibers to thermal conductivity, the thermal conductivity, tensile modulus and crystal orientation angle of ramie fibers and those drawn by the stress of 17.4 kg/mm 2 (water treatment) in the water were investigated. The tensile modulus of ramie fiber in fiber direction increased from 61 to 130 GPa by drawing in the water. The crystal orientation angles of ramie fiber with and without water treatment were measured by X-ray diffraction. The orientation degrees of ramie fibers without and with water treatment were estimated as 92.9 and 93.6%, respectively. Therefore, the tensile modulus increases two times as that of blank ramie by water treatment although crystal orientation angle does not change distinctly. The increasing of tensile modulus of ramie fiber by water treatment was explained by extension of the molecular chains in the amorphous region. Thermal conductivities of ramie fibers with and without water treatment were measured in the fiber direction in the temperature range from 10 to 150 K. Thermal conductivity of ramie fiber in the fiber direction increased by water treatment. The increasing ratio of thermal conductivity by water treatment agreed to that of sound velocity induced by increasing tensile modulus. Those results suggest that thermal conductivity of polymer fiber increase by the extension of molecular chains in the amorphous region.

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Section: Resultssupporting

confidence: 82%

Thermal conductivity of ramie fiber drawn in water in low temperature

Yamanaka

Abe

Tsutsumi

et al. 2006

J of Applied Polymer Sci

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“…Assuming that the fibers have circular cross section, the area moment of inertia is defined as I=πD4/64 where D is the fiber diameter [46]. Thus, the averaged bending stiffness of rayon (2.2 and 3.3 dtex) and PET (2.2 dtex) can be calculated as |1.98 ± 0.42×10−11, |5.76 ± 1.22×10−11 and |2.11 ± 0.53×10−11 N·m 2 , respectively, referring to the fiber diameter obtained by SEM images and the wet condition Young’s modulus data from the literature [47–51]. Note that Young’s modulus of the rayon fiber decreases in the wet condition [51].…”

Section: Resultsmentioning

confidence: 99%

“…Assuming that the fibers have circular cross section, the area moment of inertia is defined as I ¼ pD 4 =64 where D is the fiber diameter [46]. Thus, the averaged [47][48][49][50][51]. Note that Young's modulus of the rayon fiber decreases in the wet condition [51].…”

Section: Validation Of Permeability Of Nonwoven Fabricsmentioning

confidence: 99%

Permeability prediction of fibrous porous media by the lattice Boltzmann method with a fluid-structure boundary reconstruction scheme

Ando

Kaneda

Suga

2020

Journal of Industrial Textiles

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The D3Q27 lattice Boltzmann method (LBM) combined with the fluid-structure boundary reconstruction (fsBR) scheme and the interpolated bounce back (IPBB) method is extensively evaluated to predict the permeability of nonwoven fibrous porous media. The fsBR-IPBB method transfers digitally defined step-like boundary data, e.g. the three-dimensional structure data obtained by the X-ray computed tomography, to continuous smooth boundary data via level-set functions. It leads to highly accurate calculations despite low lattice resolutions of thin fibers with circular cross-sectional shapes, compared to the conventional half-way bounce back (HWBB) method. The fsBR-IPBB method is first applied to predict the permeability of two different arrays of impermeable circular cylinders and verified by comparing the results with the data in the literature. We then validate the method referring to the numerically and experimentally obtained permeability of six types of nonwoven fabrics prepared by the industrial hydroentanglement process. Finally, the discussion on the applicability and the limitation of the macroscopic correlation models to estimate permeability of porous media is carried out. The results show that although the calculated permeability is in reasonable agreement with the measured one with an error of 8.1–16.3%, analytical or empirical correlation models fail to give the correct trend due to the highly inhomogeneous and anisotropic properties of hydroentangled nonwoven fabrics.

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