Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (10): 45-52.doi: 10.13475/j.fzxb.20210604308

• Textile Engineering • Previous Articles     Next Articles

Effect of dynamic mechanical load on mechanical and electrical properties of ultra-fine gold coated molybdenum wires

LI Jianna1,2, CHEN Xi1,2, SHAO Huiqi1,2,3, SHAO Guangwei1,2,3, JIANG Jinhua1,2,3, CHEN Nanliang1,2,3()   

  1. 1. Engineering Research Center of Technical Textiles, Ministry of Education, Donghua University, Shanghai 201620, China
    2. College of Textiles, Donghua University, Shanghai 201620, China
    3. Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China
  • Received:2021-06-17 Revised:2022-05-06 Online:2022-10-15 Published:2022-10-28
  • Contact: CHEN Nanliang E-mail:nlch@dhu.edu.cn

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Abstract:

Aiming at the understanding of reduction of bending stiffness and energy dissipation in ultra-fine metal yarns after cyclic loading, yarns made from gold coated molybdenum wires with different structures were studied subject to 50 cycles of bending and 200 cycles of reciprocating friction, followed by the comparison of the morphology, tensile properties and electrical properties. The mechanical and structural responses of the yarns under cyclic bending load and friction reciprocating load were investigated, and the knittability of the yarns from metal wires was quantitatively analyzed. The results show that the micro- and macro-structures of gold coated molybdenum wire are damaged, the mechanical properties are decreased and the contact electrical resistance is slightly increased under the cyclic bending and reciprocating friction loads. The tensile rigidity and strength of double-stranded gold coated molybdenum yarns are greatly decreased under the same conditions, which is not suitable for fabric knitting. The dynamic mechanical properties and electrical properties of mono- and triple-stranded gold-coated molybdenum wires are stable under dynamic load, which can be used as raw materials for knitting electromagnetic shielding fabrics.

Key words: gold coated molybdenum wire, cyclic bending, reciprocating friction, knittability, electrical performance, metallic yarn

CLC Number: 

  • TS181

Fig.1

Structure of gold coated molybdenum wire with three structures"

Fig.2

Schematic diagram for cyclic three-point bending test"

Fig.3

Schematic diagram for reciprocating friction test"

Fig.4

Schematic diagram of contact resistance test equipment"

Fig.5

Analysis of cyclic bending loading. (a) Bending deflection-loading time alternating curve; (b) Typical bending load response"

Fig.6

Cyclic bending load-bending deflection curves of gold coated molybdenum wire. (a) Mono-stranded;(b) Double-stranded; (c) Triple-stranded"

Fig.7

Degradation of bending stiffness of gold coated molybdenum wire"

Fig.8

Energy dissipation analysis of gold coated molybdenum yarn under cyclic bending loading. (a) Total strain energy; (b) Elastic strain energy; (c) Dissipation energy; (d) Dissipation rate"

Fig.9

Morphology of gold coated molybdenum wire before and after 200 times of reciprocating friction. (a) Stereoscopic microscope images before friction;(b) Stereoscopic microscope images after friction; (c) Scanning electron microscope images before friction;(d) Scanning electron microscope images after friction"

Tab.1

Au element analysis of gold coated molybdenum wire before and after reciprocating friction"

金属丝
股数		 摩擦前Au
元素占比/%		 摩擦后Au
元素占比/%		 损耗率/
%
1 92.50 89.49 3.25
2 90.52 78.72 13.04
3 91.17 86.90 4.68

Fig.10

Tensile properties of gold coated molybdenum wire before and after reciprocating friction. (a) Breaking strength; (b) Elongation at break"

Tab.2

Contact resistance of gold coated molybdenum wire before and after reciprocating friction"

金属丝
股数		 摩擦前接
触电阻/Ω		 摩擦后接
触电阻/Ω		 电阻变化
率/%
1 14.43 14.87 3.04
2 10.79 11.37 5.33
3 9.60 10.19 6.21
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