3D‐Printed Mechano‐Optic Force Sensor for Soft Robotic Gripper Enabled by Programmable Structural Metamaterials

Author:

Hegde Chidanand12,Mysa Ravi Chaithanya23,Chooi Aaron23,Dontu Saikrishna23,Tan Joel Ming Rui12,Wong Lydia Helena12ORCID,Alvarado Pablo Valdivia y23ORCID,Magdassi Shlomo124ORCID

Affiliation:

1. School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore

2. Singapore‐HUJ Alliance for Research and Enterprise (SHARE) The Smart Grippers for Soft Robotics (SGSR) Programme Campus for Research Excellence and Technological Enterprise (CREATE) Singapore 138602 Singapore

3. Digital Manufacturing and Design Centre Singapore University of Technology and Design 8 Somapah Road Singapore 487372 Singapore

4. Casali Center for Applied Chemistry Institute of Chemistry The Hebrew University of Jerusalem Jerusalem 91904 Israel

Abstract

Rapid deployment of automation in today's world has opened up exciting possibilities in the realm of design and fabrication of soft robotic grippers endowed with sensing capabilities. Herein, a novel design and rapid fabrication by 3D printing of a mechano‐optic force sensor with a large dynamic range, sensitivity, and linear response, enabled by metamaterials‐based structures, is presented. A simple approach for programming the metamaterial's behavior based on mathematical modeling of the sensor under dynamic loading is proposed. Machine learning models are utilized to predict the complete force–deformation profile, encompassing the linear range, the onset of nonlinear behavior, and the slope of profiles in both bending and compression‐dominated regions. The design supports seamless integration of the sensor into soft grippers, enabling 3D printing of the soft gripper with an embedded sensor in a single step, thus overcoming the tedious and complex and multiple fabrication steps commonly applied in conventional processes. The sensor boasts a fine resolution of 0.015 N, a measurement range up to 16 N, linearity (adj. R2–0.991), and delivers consistent performance beyond 100 000 cycles. The sensitivity and range of the embedded mechano‐optic force sensor can be easily programmed by both the metamaterial structure and the material's properties.

Funder

National Research Foundation Singapore

Publisher

Wiley

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