A Study on the Motion Control of 3D Printed Fingers

Jung, Imjoo; Park, Ye-eun; Choi, Young-Rim; Kim, Jong-Wook; Lee, Sun Hee

doi:10.5805/sfti.2022.24.3.333

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…Previously, a study was carried out on the motion control of 3D-printed (3DP) fingers with two types of samples: cap and RE. It was observed in the study that the RE samples were more suitable in terms of finger movements and grabbing as it was very easy to bend due to their synclasticity relating to their auxetic structure [27]. In another study of a 3DP wrist brace, it was observed that TPU has excellent shock absorption properties relating to its high negative Poisson ratio (NPR) and toughness [28].…”

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

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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: 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

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Shape recovery properties of 3D printed re-entrant strip using shape memory thermoplastic polyurethane filaments with various temperature conditions

Jung

Lee

2023

Fash Text

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In this research, to confirm the applicability as the actuator of the re-entrant (RE) structure strip using 3D printing with shape memory thermoplastic polyurethane material, two types of 3D printing infill conditions and five extension temperature conditions were applied. REstrip was analyzed through differential scanning calorimetry (DSC), tensile properties, Poisson’s ratio properties, and shape recovery properties according to temperature conditions. The DSC results showed that the glass transition temperature peaks of the SMTPU filament and the 3D printed REstrip were in the range of about 30–60 °C. In terms of tensile properties, the initial modulus, maximum stress, and yield stress of REstrip all decreased, while the elongation at break increased with increasing extension temperature. In terms of Poisson’s ratio, it was confirmed that as the extension temperature rises, Poisson’s ratio shows a positive value at a lower elongation, and the deformation is best at 50 °C. As a result of the shape memory property, the shape recovery ratio tended to decrease as the tensile deformation temperature increased.

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Characterization of 3D Printed Re-entrant Strips Using Shape Memory Thermoplastic Polyurethane with Various Infill Density

Jung¹

2022

FTRJ

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A Study on the Motion Control of 3D Printed Fingers

Cited by 4 publications

References 15 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

Shape recovery properties of 3D printed re-entrant strip using shape memory thermoplastic polyurethane filaments with various temperature conditions

Characterization of 3D Printed Re-entrant Strips Using Shape Memory Thermoplastic Polyurethane with Various Infill Density

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