Charaterizations of 3D printed re-entrant pattern/aramid knit composite prepared by various tilting angles

Jung, Imjoo; Kim, Hyelim; Lee, Sun Hee

doi:10.1186/s40691-021-00273-6

Cited by 8 publications

(8 citation statements)

References 20 publications

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“…In terms of bending properties, the test was conducted according to the methods used in previous studies [10,12]. Figure 2 shows the universal mechanical testing machine (AGS-X, Shimadzu Co. Ltd., Kyoto, Japan) used to carry out the bending test to determine the bending characteristics of FA and UA samples with various thicknesses.…”

Section: Mechanical Properties Of 3d-printed Humanoid Robot Arm With ...mentioning

confidence: 99%

“…In an auxetic structure, deformation starts from one cell, which is followed by the cells in the particular row [7][8][9]. The energy absorption properties of auxetic materials are excellent as the structure causes the material to swell when compressed, withstanding the load applied [10]. Due to their unique properties, they have found applications in industries like fashion, aerospace, automotive, sports, medical textiles, footwear, and architecture [9,11,12].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Exterior Parts for 3D-Printed Humanoid Robot Arm with Various Patterns and Thicknesses

Chowdhury,

Park,

Jung

et al. 2024

Polymers

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Currently, metal is the most common exterior material used in robot development due to the need to protect the motor. However, as soft, wearable, and humanoid robots are gradually being developed, many robot parts need to be converted into artificial skin using flexible materials. In this study, in order to develop soft exterior parts for robots, we intended to manufacture exterior robot arm parts via fused filament fabrication (FFF) 3D printing according to various structural and thickness conditions and analyze their mechanical properties. The exterior parts of the robot arms were manufactured utilizing Shore 95 A TPU (eTPU, Esun, Shenzhen, China), which is renowned for its softness and exceptional shock absorption characteristics. The exterior robot arm parts were modeled in two parts, the forearm and upper arm, by applying solid (SL) and re-entrant (RE) structures and thicknesses of 1, 2, and 4 mm. The mechanical properties were analyzed through the use of three-point bending, tensile, and compression testing. All of the characterizations were analyzed using a universal testing machine (AGS-X, SHIMADZU, Kyoto, Japan). After testing the samples, it was confirmed that the RE structure was easily bendable towards the bending curve and required less stress. In terms of the tensile tests, the results were similar to the bending tests; to achieve the maximum point, less stress was required, and for the compression tests, the RE structure was able to withstand the load compared to the SL structure. Therefore, after analyzing all three thicknesses, it was confirmed that the RE structure with a 2 mm thickness had excellent characteristics in terms of bending, tensile, and compressive properties. Therefore, the re-entrant pattern with a 2 mm thickness is more suitable for manufacturing a 3D-printed humanoid robot arm.

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Section: Mechanical Properties Of 3d-printed Humanoid Robot Arm With ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of Exterior Parts for 3D-Printed Humanoid Robot Arm with Various Patterns and Thicknesses

Chowdhury,

Park,

Jung

et al. 2024

Polymers

Self Cite

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“…Imjoo Jung et al compared the two types of fabric composites—aramid knit (ARNT) and 3D printed auxetic re‐entrant pattern (3DP‐RE) with the help of CFDM (conveyor FDM). Thus by comparing the mechanical properties it discovered that the 3DP‐RE/ARNT composite fabric have excellent properties 93 …”

Section: Thermoplastic Polyurethanementioning

confidence: 99%

“…Imjoo Jung et al compared the two types of fabric compositesaramid knit (ARNT) and 3D printed auxetic re-entrant pattern (3DP-RE) with the help of CFDM (conveyor FDM). Thus by comparing the mechanical properties it discovered that the 3DP-RE/ARNT composite fabric have excellent properties 93. Jiacheng Ji et al incorporate the different types of materials like carbon fibers/alumina/silicon rubber and so forth in TPU to check the thermal conductivity of the polymer product.…”

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confidence: 99%

Thermoplastic polyurethane for three‐dimensional printing applications: A review

Desai

Sonawane

2023

Polymers for Advanced Techs

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Additive manufacturing is an emerging technology with the advantage of less wastage, fast prototyping with customized designing suitable for a wide range of applications. Three‐dimensional (3D) printing is one of the types of additive manufacturing and various polymers are explored for 3D printing applications. Thermoplastic polyurethane (TPU) is a versatile material that has gained increasing attention in 3D printing applications due to its unique combination of mechanical, thermal, and chemical properties. This review paper provides an overview of the current state‐of‐the‐art in TPU‐based 3D printing, including its characteristics, processing techniques, and mainly its applications. Extensive studies are done in TPU with fused deposition modeling (FDM), multi‐jet fusion (MJF), and selective laser sintering (SLS). The elasticity and flexibility, layer adhesion, tensile strength, and support structure are the parameters that decide the suitability of FDM, SLS, and MJF for TPU 3D printing. The infill density, modification of processing parameters, use of sacrificial materials, addition of perforations or channels, varying the particle size, using a mixture of powders, and so forth. leads to develop the porous structure in the final product. In addition, we have studied blends of TPU with other polymers like acrylonitrile butadiene styrene (ABS) and polylactic acid (PLA), as well as fiber‐reinforced TPU composites for 3D printing applications.

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“…Similarly, Takahashi and Kim 26 fabricated a soft and flexible textile by considering bending properties with the use of an FDM 3D printer. Jung et al 27 concluded that the compression strength and toughness of 3D printed auxetic re-entrant pattern/textile composite fabrics are excellent when compared to those of the substrate fabric. Furthermore, Eom et al 28 analyzed the thermal properties of 3D printed TPU with different 3D structures.…”

Section: Introductionmentioning

confidence: 99%

Wearable properties of polylactic acid and thermoplastic polyurethane filaments 3D printed on polyester fabric

Liu

Jiang

2023

Journal of Industrial Textiles

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Three-dimensional (3D) printing on textile substrates is a promising method to create objects with a variety of different materials that have tailored mechanical properties. This synthesis of technology is favored by current researchers to retain the characteristics of 3D printing while maintaining the wear comfort of fabrics. Although the importance and potential of textile-based 3D printing have been recognized, it is worth noting that there is still a lack of comprehensive studies on the basic wearable properties. In this study, polylactic acid (PLA) and thermoplastic polyurethane (TPU) are extruded separately onto polyester fabric. Then the wearable properties are examined through bending, compression, thermal conductivity, and thermography tests, which are carried out by using the KES-FB system and a thermal imager. The results indicate that the printed PLA on polyester fabric has a better washing resistance than the printed TPU on polyester fabric with a smaller reduction in the peel force after different washing cycles. The rate of decline of the printed TPU samples is 53.2%, which is more than twice that of the printed PLA samples (20.4%) after 30 washing cycles. In terms of the physical and thermal properties, the results show that the bending rigidity, bending hysteresis, compression energy, k values, and thermal insulation properties of the PLA and TPU samples are generally well-correlated with the number of printed layers. Further applications can be explored based on the results reported in this paper.

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Charaterizations of 3D printed re-entrant pattern/aramid knit composite prepared by various tilting angles

Cited by 8 publications

References 20 publications

Characterization of Exterior Parts for 3D-Printed Humanoid Robot Arm with Various Patterns and Thicknesses

Characterization of Exterior Parts for 3D-Printed Humanoid Robot Arm with Various Patterns and Thicknesses

Thermoplastic polyurethane for three‐dimensional printing applications: A review

Wearable properties of polylactic acid and thermoplastic polyurethane filaments 3D printed on polyester fabric

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