Fashion & Textile Research Journal (한국의류산업학회지)

The Society of Fashion and Textile Industry (한국의류산업학회)
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Characterization of 3D Printed Re-entrant Strips Using Shape Memory Thermoplastic Polyurethane with Various Infill Density

채우기 밀도별 형상 기억 TPU 3D 프린팅 Re-entrant 스트립의 특성 분석

  • Imjoo Jung (Dept. Fashion & Textiles, Dong-A University) ;
  • Sunhee Lee (Dept. Fashion Design, Dong-A University)
  • 정임주 (동아대학교 의상섬유학과) ;
  • 이선희 (동아대학교 패션디자인학과)
  • Received : 2022.11.25
  • Accepted : 2022.12.12
  • Published : 2022.12.31
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Abstract

This study proposes to develop a 3D printed re-entrant(RE) strip by shape memory thermoplastic polyurethane that can be deformed and recovered by thermal stimulation. The most suitable 3D printing infill density condition and temperature condition during shape recovery for mechanical behavior were confirmed. As the poisson's ratio indicated, the higher the recovery temperature, the closer the poisson's ratio to zero and the better the auxetic properties. After recovery testing for five minutes, it appeared that the shape recovery ratio was the highest at 70℃. The temperature range when the shape recovery ratio appeared to be more than 90% was a recovery temperature of more than 50℃ and 60℃ when deformed under a constant load of 100 gf and 300 gf, respectively. This indicated that further deformation occurred after maximum recovery when recovered at a temperature of 80℃, which is above the glass transition temperature range. As for REstrip by infill density, a shape recovery properties of 100% was superior than 50%. Additionally, as the re-entrant structure exhibited a shape recovery ratio of more than 90%, and exhibited auxetic properties. It was confirmed that the infill density condition of 100% and the temperature condition of 70℃ are suitable for REstrips for applying the actuator.

Keywords

Acknowledgement

본 연구는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(NRF-2021R1A4A1022059).

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