Abstract
To evaluate the electrical heating performance by auxetic pattern, re-entrant honeycomb (RE), chiral truss (CT), honeycomb (HN), and truss (TR), using graphene/PLA (Polylactic acid) filament, were manufactured by CFDM (conveyor fused deposition modelling) 3D printer. In addition, HN and TR, which was indicated to have an excellent electrical heating property, were selected to verify the feasibility of applying fabric heating elements. The result of morphology was that the number of struts constituting the unit cell and the connected points were TR < HN < CT < RE. It was also influenced by the surface resistivity and electrical heating performance. RE, which has the highest number of struts constituting the unit cell and the relative density, had the highest value of surface resistivity, and the lowest value was found in the opposite TR. In the electrical heating performance of samples, the heat distribution of RE was limited even when the applied voltage was increased. However, HN and TR were diffused throughout the sample. In addition, the surface temperature of RE, CT, HN, and TR was about 72.4 °C, 83.1 °C, 94.9 °C, and 85.9, respectively as applied at 30 V. When the HN and TR were printed on cotton fabric, the surface resistivity of HN/cotton and TR/cotton was about 103 Ω/sq, which showed conductive material. The results of electrical heating properties indicated that the heat distribution of HN/cotton showed only in the region where power was supplied, but the TR/cotton was gradually expanded and presented stable electric heating properties. When 30 V was applied, the surface temperature of both samples showed more than 80 °C, and the shape was maintained stably due to the high thermal conductivity of the cotton fabric. Therefore, this study ensured that HN and TR show excellent electrical heating performance among four types of auxetic patterns with continuity.
Highlights
A cellular structure is defined as an object’s architecture as formed by and array of spatial arrangement of unit cells with edges and faces
It is known that these macro-scale mechanical properties of auxetic structures originate from their different smallscale topology and mainly used applications that are different depending on their geometrical features of structure [5]
To analyze of Graphene/PLA-based CFDM 3D printed auxetic patterns and its composite fabrics, the morphology was measured by digital camera (HDR-CX550, Sony, corp., Tokyo, Japan), and fabric image analysis microscopy (NT 100, Nextec, Gunpo, Korea) at ×6.5 magnification
Summary
A cellular structure is defined as an object’s architecture as formed by and array of spatial arrangement of unit cells with edges and faces. The honeycomb structure, which is a continuous structure using two types of carbon nano-based conductive filaments, was printed by CFDM 3D printer, and the electrical and electrical heating properties of the sample were excellent at the CD direction [27]. The substrate fabric selected was a cotton fabric with plain structure, having a thickness of 0.27 ± 0.01 mm, a weight per unit area of 0.019 ± 0.001 g/cm, and a density of warp and weft yarns of 72/inch and 64/inch, respectively. It was prepared at a size of 60 mm × 60 mm. To analyze of Graphene/PLA-based CFDM 3D printed auxetic patterns and its composite fabrics, the morphology was measured by digital camera (HDR-CX550, Sony, corp., Tokyo, Japan), and fabric image analysis microscopy (NT 100, Nextec, Gunpo, Korea) at ×6.5 magnification
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