Determining the Impact Permeability Index of Textiles

Gniotek, K.; Tokarska, Magdalena

doi:10.1177/004051750207200214

Textile Research Journal

2002

DOI: 10.1177/004051750207200214

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Determining the Impact Permeability Index of Textiles

K. Gniotek

Magdalena Tokarska

Abstract: A new feature of flat textiles—impact permeability—is presented. It refers to differ ences in the behavior of textiles in stable and variable conditions of through airflows. A determination procedure is described in detail, and an example of an impact permeability assessment of a cotton fabric is presented.

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Cited by 2 publications

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Dynamic Effects on Moisture Transport in Asphalt Concrete

Kutay

Aydilek

2007

J. Transp. Eng.

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Permeability of an asphalt pavement is one of the most important parameters that have a direct influence on its design life. It is an intrinsic property that relates the average fluid velocity to a constant pressure gradient; however, the external pressures on a saturated pavement pore structure are often dynamic due to the repeated tire loading in the field. A dynamic permeability constant, therefore, is a more realistic representation of the response of a pavement pore structure to external stresses. In order to investigate the unsteady ͑dynamic͒ fluid flow in asphalt pavements, a three-dimensional fluid flow model was developed using the lattice Boltzmann method. The model was validated using the well-known closed form solution of oscillating flow through a circular tube. Simulations were carried out to calculate the permeabilities of different asphalt specimens exposed to pulsatile pressures as well as the pore pressures and shear stresses at the solid-water interfaces. The results indicated that the dynamic permeability of an asphalt pore structure collapses on a single curve for a given frequency, confirming a universal behavior. Dynamic effects were generally limited to near the surface of the specimens analyzed, and the pore pressures and velocities varied nonlinearly along the depth due to the heterogeneous nature of the asphalt specimens. The results are encouraging yet should be considered preliminary as they are based on stone matrix asphalt specimens and one type of pulsatile load analyzed.

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Dynamic Effects on Moisture Transport in Asphalt Concrete

Kutay

Aydilek

2007

J. Transp. Eng.

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Neural Model of the Permeability Features of Woven Fabrics

Tokarska

2004

Textile Research Journal

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A method of modeling woven fabric permeability features by means of neural nets is presented. The experiment is based on a steady-system design. A formal dependence is found, describing the relationship of the integral of a function that is a real pressure impulse formed on the woven fabric under impact air flow conditions, with its apparent density, warp twist, and weft twist. The model is assessed by verifying the structure of the neural net.

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Determining the Impact Permeability Index of Textiles

Cited by 2 publications

References 3 publications

Dynamic Effects on Moisture Transport in Asphalt Concrete

Dynamic Effects on Moisture Transport in Asphalt Concrete

Neural Model of the Permeability Features of Woven Fabrics

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