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 2 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%