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This chapter focuses on the manufacturing of re-entrant (RE) structures made from polyurethane (PU) composites using 3D printing. Four types of structural models are generally selected, consisting of conventional honeycomb, RE honeycomb, tetrachiral and arrowhead structures. It is then followed by manufacturing techniques such as material extrusion (ME), material jetting (MJ), powder bed fusion (PBF) and vat photopolymerisation (VP) to fabricate such structures. Modelling approaches are also involved in order to create the best models in order to produce 3D printed structures with the desired characteristics. Finally, the properties of those RE structures, comprising Poisson’s ratio (PR), compressive properties, energy absorption, fatigue, shape memory behaviour, electrical conductivity and piezoresistance, are discussed to provide valuable information in relation to 3D printed RE structures.

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3D Printing of Re-Entrant Structures

  • 章节

  • 发表日期：

    2026年

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  • Wendy Triadji Nugroho,
  • Yu Dong,
  • Alokesh Pramanik

摘要

This chapter focuses on the manufacturing of re-entrant (RE) structures made from polyurethane (PU) composites using 3D printing. Four types of structural models are generally selected, consisting of conventional honeycomb, RE honeycomb, tetrachiral and arrowhead structures. It is then followed by manufacturing techniques such as material extrusion (ME), material jetting (MJ), powder bed fusion (PBF) and vat photopolymerisation (VP) to fabricate such structures. Modelling approaches are also involved in order to create the best models in order to produce 3D printed structures with the desired characteristics. Finally, the properties of those RE structures, comprising Poisson’s ratio (PR), compressive properties, energy absorption, fatigue, shape memory behaviour, electrical conductivity and piezoresistance, are discussed to provide valuable information in relation to 3D printed RE structures.