A bioinspired 3D-printable flexure joint with cellular mechanical metamaterial architecture for soft robotic hands

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Abstract

Compliant flexure joints have been widely used for cable-driven soft robotic hands and grippers due to their safe interaction with humans and objects. This paper presents a soft and compliant revolute flexure joint based on the auxetic cellular mechanical metamaterials with a heterogeneous structure. The heterogeneous architecture of the proposed metamaterial flexure joint (MFJ), which is inspired by the human finger joints, provides mechanically tunable multi-stiffness bending motion and large range of bending angle in comparison to conventional flexure joints. The multi-level variation of the joint stiffness over the range of bending motion can be tuned through the geometrical parameters of the cellular mechanical metamaterial unit cells. The proposed flexure joints are 3D printed with single flexible material in monolithic fashion using a standard benchtop 3D printer. The application of the MFJ is demonstrated in robotic in-hand manipulation and grasping thin and deformable objects such as wires and cables. The results show the capability and advantages of the proposed MFJ in soft robotic grippers and highly functional bionic hands.

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CITATION STYLE

APA

Mohammadi, A., Hajizadeh, E., Tan, Y., Choong, P., & Oetomo, D. (2023). A bioinspired 3D-printable flexure joint with cellular mechanical metamaterial architecture for soft robotic hands. International Journal of Bioprinting, 9(3). https://doi.org/10.18063/ijb.696

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