Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Manufacturing Experiments using FDM 3D-printed Flexible Resistance Sensors with Heterogeneous Polymer Material Annealing

이종 폴리머재료 어닐링을 이용한 유연저항센서 FDM 3D프린팅 제작실험

  • Lee, Sun Kon (Department of Mechanical Engineering, Inha University) ;
  • Oh, Young Chan (Department of Mechanical Engineering, Inha University) ;
  • Kim, Joo Hyung (Department of Mechanical Engineering, Inha University)
  • Received : 2019.09.04
  • Accepted : 2019.12.04
  • Published : 2020.01.31
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Abstract

In this paper, the performances of the electrical characteristics of the Fused Deposition Modeling (FDM) 3D-printed flexible resistance sensor was evaluated. The FDM 3D printing flexible resistive sensor is composed of flexible-material thermoplastic polyurethane and a conductive PLA (carbon black conductive polylactic acid) polymer. While 3D printing, polymer filaments heat up quickly before being extruded and cooled down quickly. Polymers have poor thermal conductivity so the heating and cooling causes unevenness, which then results in internal stress on the printed parts due to the rapidity of the heating and cooling. Electrical resistance measurements show that the 3D-printed flexible sensor is unstable due to internal stress, so the 3D-printed flexible sensor resistance curve does not match the increases and decreases in the displacement curve. Therefore, annealing was performed to eliminate the mismatch between electrical resistance and displacement. Annealing eliminates residual stress on the sensor, so the electrical resistance of the sensor increases and decreases in proportion to displacement. Additionally, the resistance is lowered in comparison to before annealing. The results of this study will be very useful for the fabrication of various devices that employ 3D-printed flexible sensor that have multiple degrees of freedom and are not limited by size and shape.

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References

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