@article{2181, abstract = { Crocheted textiles receive scarce scientific study and are at present not produced in automatized industrial scale. Computer-aided modelling and simulation offer capabilities for investigating possible technical fields of application. In this context a novel approach for modelling crocheted textiles consisting of chains, slip stitches and single crochets using a topology based and parameterized key point representation at the meso scale is proposed. According to the stitch size, yarn diameter and pattern spline interpolated models, which are free of interpenetrations up to approximately a 1/10 ratio of yarn diameter to stitch size, are generated by a developed Python program and software from the company TexMind. The models are suitable for finite element method (FEM) applications with LS-DYNA with which the mechanical properties of crocheted textiles can be studied. Exemplary simulations show anisotropic properties and homogeneous distribution of stresses in a crocheted textile. Due to the computationally simple and flexible modelling the presented approach may serve as a tool for designing planar crocheted textiles. This allows for estimation of the required yarn length and offers the prediction capabilities of simple and fast FEM simulations based on beam elements. }, author = {Storck, Jan Lukas and Gerber, Dennis and Steenbock, Liska and Kyosev, Yordan}, issn = {1530-8057}, journal = {Journal of Industrial Textiles}, publisher = {SAGE Publications}, title = {{Topology based modelling of crochet structures}}, doi = {10.1177/15280837221139250}, volume = {52}, year = {2022}, } @article{1055, abstract = { Polyacrylonitrile can be used as a base material for thermochemical conversion into carbon. Especially nanofiber mats, produced by electrospinning, are of interest to create carbon nanofibers. Optimal stabilization and carbonization parameters, however, strongly depend on the spatial features of the original material. While differences between nano- and microfibers are well known, this paper shows that depending on the electrospinning method and the solvent used, considerable differences between various nanofiber mats have to be taken into account for the optimization of the stabilization conditions. Here, we examine for the first time polyacrylonitrile nanofiber mats, electrospun with wire electrospinning from the low-toxic dimethyl sulfoxide as a solvent, instead of the typically used needle electrospinning from the toxic dimethylformamide. Additionally, we used inexpensive polyacrylonitrile from knitting yarn instead of highly specialized material, tailored for carbonization. Our results show that by carefully controlling the maximum stabilization temperature and especially the heating rate, fully stabilized polyacrylonitrile fibers without undesired interconnections can be created as precursors for carbonization. }, author = {Sabantina, Lilia and Klöcker, Michaela and Wortmann, Martin and Mirasol, José Rodríguez and Cordero, Tomás and Moritzer, Elmar and Finsterbusch, Karin and Ehrmann, Andrea}, issn = {1530-8057}, journal = {Journal of Industrial Textiles}, number = {2}, pages = {224--239}, publisher = {SAGE Publications}, title = {{Stabilization of polyacrylonitrile nanofiber mats obtained by needleless electrospinning using dimethyl sulfoxide as solvent}}, doi = {10.1177/1528083718825315}, volume = {50}, year = {2020}, } @article{1056, abstract = { Textile fabrics are often subject to abrasion, starting from exposed parts of garments to a variety of technical textiles. Abrasion protection by usual coatings, however, can significantly decrease the water vapor transport through a fabric which is often not desired, especially in the case of garments. In our paper, we report on an approach to combine increased abrasion resistance with sufficient water vapor transport properties. For this, different polymers (poly(methyl methacrylate), acrylonitrile butadiene styrene, or amorphous polyamides) were coated on cotton and polyester woven fabrics. The results of abrasion tests against sandpaper show significantly increased abrasion resistance. The absolute evaporation resistance, measured by a Permetest testing device, was only slightly increased up to values still acceptable for typical garments. Images of all coatings by helium ion microscopy deliver an explanation for the measuring results. Polymer coatings on the polyester fabric resulted in a slight reduction of the hydrophobicity, while coating the cotton fabric severely increased the contact angles of the originally superhydrophilic material. }, author = {Wortmann, Martin and Frese, Natalie and Hes, Lubos and Gölzhäuser, Armin and Moritzer, Elmar and Ehrmann, Andrea}, issn = {1530-8057}, journal = {Journal of Industrial Textiles}, number = {5}, pages = {572--583}, publisher = {SAGE Publications}, title = {{Improved abrasion resistance of textile fabrics due to polymer coatings}}, doi = {10.1177/1528083718792655}, volume = {49}, year = {2018}, }