Non-destructive X-ray examination of weft knitted wire structures

48th Conference of the International Federation of Knitting Technologists (IFKT)

材料科学;轻工业

Obermann, M.^1 ; Ellouz, M.^2 ; Aumann, S.^1 ; Martens, Y.^2 ; Bartelt, P.^2 ; Klöcker, M.^2 ; Kordisch, T.^2 ; Ehrmann, A.^2 ; Weber, M.O.^1

Niederrhein University of Applied Sciences, Faculty of Textile and Clothing Technology, Mönchengladbach, Germany^1

Bielefeld University of Applied Sciences, Faculty of Engineering and Mathematics, Bielefeld, Germany^2

关键词: Conductive parts;    Different structure;    Energy transmission;    Flat knitting machines;    Knitted structures;    Mechanical loads;    Mechanical treatments;    X ray examination;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/141/1/012007/pdf
DOI  :  10.1088/1757-899X/141/1/012007

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Conductive yarns or wires are often integrated in smart textiles to enable data or energy transmission. In woven fabrics, these conductive parts are fixed at defined positions and thus protected from external loads. Knitted fabrics, however, have relatively loose structures, resulting in higher impacts of possible mechanical forces on the individual yarns. Hence, metallic wires with smaller diameters in particular are prone to break when integrated in knitted fabrics. In a recent project, wires of various materials including copper, silver and nickel with diameters varying between 0.05 mm and 0.23 mm were knitted in combination with textile yarns. Hand flat knitting machines of appropriate gauges were used to produce different structures. On these samples, non-destructive examinations, using an industrial X-ray system Seifert x|cube (225 kV) equipped with a minifocus X-ray tube, were carried out, directly after knitting as well as after different mechanical treatments (tensile, burst, and washing tests). In this way, structural changes of the stitch geometry could be visualized before failure. In this paper, the loop geometries in the knitted fabrics are depicted depending on knitted structures, wire properties and the applied mechanical load. Consequently, it is shown which metallic wires and yarns are most suitable to be integrated into knitted smart textiles.