Abstract
Especially for textiles, which contain open structure pores, airflow carrying heat energy transfers from one side to another side by conduction and convection. Convective heat transfer plays a very important role in thermal transfer performance of textiles due to its porous structure. Compression sportswear are generally produced from knitted porous stretch fabrics, which get extended on wearing and remain in the extended state. Since they are worn next to skin and are direct contact with the body surface, their thermal comfort properties are effective on overall clothing comfort. Perhaps the greater contact of the garment to the skin together with the constant airflow can transfer the heat better from the body to the environment. Most of the well-known auxetic materials possess porous microstructures and the sizes of the pores of auxetic materials can vary during the compressive and tensile deformation. In this study, an investigation has been made to evaluate the auxetic effect on the thermal transfer performance of clothing. Two type fabrics having the very similar fabric properties but different knitting structures were provided from the market and producer. While one has an auxetic structure, the other has a standard warp knitting structure commonly used in market. As Permeability and porosity are strongly related to each other, we compared air permeability of fabrics in extended state considering the fabric extension results taken from virtual avatar having the same body measurements as subjects in 3D simulation. Fabric surface temperature changes on different clothed body parts investigated by an infrared thermal camera and analysed in thermal camera software (Flir Tools) for thermal transfer performance according to the wearing protocol.
Highlights
Compression sportswear has grown immensely and become attractive in personel or team sports in recent years
As a compression garment extends in width as well as length when worn, the constructional and air permeability properties were measured at relaxed condition and in different extended conditions
Negative poisson's ration and air permeability were measured by extending the fabric on the frame
Summary
Compression sportswear has grown immensely and become attractive in personel or team sports in recent years. Compression garments elongates up to 10% in lenght and 60% in width when worn, depending on the variations in body circumference. This stretch changes the loop shape, density, thickness of fabric and porosity. The assessment of sport garments, their impact on the skin using thermography, enables great advances in the field of garment design and its consequence on sport performance and thermal comfort [3]. Conventional materials generally have positive poisson's ratio, contracting laterally when stretched and expanding laterally when compressed. Auxetic materials are quite the opposite, they exhibit a negative poisson's ratio and expand laterally when stretched and contract laterally when compressed. The auxetic property is achieved by unfolding the re-entrant units as shown in Figure 1-a [10]
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