Characterization of 3D Printed Wrist Brace with Various Tilting Angles of Re-entrant Pattern Using Thermoplastic Elastomer

Park, Ye-eun; Lee, Hyejin; Jung, Imjoo; Lee, Sun Hee

doi:10.5850/jksct.2022.46.6.1074

Cited by 3 publications

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“…The SL and RE of the FA and UA samples of 1, 2, and 4 mm thicknesses were compared by checking the actual time after printing. The actual time was checked to distinguish which samples have more efficiency in relation to the thickness and patterns [28]. The actual time was calculated by taking the ratio of the relative value of each thickness of both patterns.…”

Section: Actual Printing Time and Weight Of 3d-printed Humanoid Robot...mentioning

confidence: 99%

“…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]. TPU provides several benefits in terms of elasticity, shock absorption, high resistance, and easy structural customization.…”

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: Actual Printing Time and Weight Of 3d-printed Humanoid Robot...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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Characterization of PLA/LW-PLA Composite Materials Manufactured by Dual-Nozzle FDM 3D-Printing Processes

Park,

Lee

2024

Polymers

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This study investigates the properties of 3D-printed composite structures made from polylactic acid (PLA) and lightweight-polylactic acid (LW-PLA) filaments using dual-nozzle fused-deposition modeling (FDM) 3D printing. Composite structures were modeled by creating three types of cubes: (i) ST4—built with a total of four alternating layers of the two filaments in the z-axis, (ii) ST8—eight alternating layers of the two filaments, and (iii) CH4—a checkered pattern with four alternating divisions along the x, y, and z axes. Each composite structure was analyzed for printing time and weight, morphology, and compressive properties under varying nozzle temperatures and infill densities. Results indicated that higher nozzle temperatures (230 °C and 240 °C) activate foaming, particularly in ST4 and ST8 at 100% infill density. These structures were 103.5% larger on one side than the modeled dimensions and up to 9.25% lighter. The 100% infill density of ST4-Com-PLA/LW-PLA-240 improved toughness by 246.5% due to better pore compression. The ST4 and ST8 cubes exhibited decreased stiffness with increasing temperatures, while CH4 maintained consistent compressive properties across different conditions. This study confirmed that the characteristics of LW-PLA become more pronounced as the material is printed continuously, with ST4 showing the strongest effect, followed by ST8 and CH4. It highlights the importance of adjusting nozzle temperature and infill density to control foaming, density, and mechanical properties. Overall optimal conditions are 230 °C and 50% infill density, which provide a balance of strength and toughness for applications.

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Tpu 소재를 이용한 3d 프린팅 로봇 손의 제어기 설계에 관한 연구

최,

박,

김

et al. 2024

J. Korean Soc. Cloth. Text

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Characterization of 3D Printed Wrist Brace with Various Tilting Angles of Re-entrant Pattern Using Thermoplastic Elastomer

Cited by 3 publications

References 0 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

Characterization of PLA/LW-PLA Composite Materials Manufactured by Dual-Nozzle FDM 3D-Printing Processes

Tpu 소재를 이용한 3d 프린팅 로봇 손의 제어기 설계에 관한 연구

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