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Magnetically controlled bio-inspired elastomeric actuators with high mechanical energy storage.

Mohammadreza Lalegani Dezaki1, Mahdi Bodaghi1

  • 1Department of Engineering, School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK. mahdi.bodaghi@ntu.ac.uk.

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Summary

This study presents a novel bioinspired design for soft magnetic actuators that store elastic energy for efficient operation. These actuators achieve rapid shape recovery and strong grasping force, enabling versatile applications.

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Area of Science:

  • Biomimetic engineering
  • Soft robotics
  • Materials science

Background:

  • Biological systems leverage elastic energy for enhanced speed, efficiency, and power.
  • Pre-stressed soft magnetic actuators offer potential for advanced robotic applications.
  • Existing actuators often require high magnetic fields or external stimuli for shape recovery.

Purpose of the Study:

  • To introduce a straightforward bioinspired design for rapidly manufacturing pre-stressed soft magnetic actuators.
  • To develop actuators that operate at lower magnetic field strengths and exhibit autonomous shape recovery.
  • To demonstrate the programmability of actuator shape and actuation sequence through controlled pre-stressing.

Main Methods:

  • Bioinspired design incorporating tendril plant and chameleon's tongue structures.
  • Pre-stressing of elastomeric layers to store elastic energy.
  • Fabrication of round and helical shaped actuators.
  • Development of analytical models for energy storage, radius, and pitch.
  • Experimental analysis of shape changes, grasping action, and actuation force.

Main Results:

  • Actuators demonstrated activation at lower magnetic field strengths and autonomous shape recovery.
  • Programmable shapes and actuation sequences were achieved by controlling pre-stressing forces.
  • High-speed shape recovery and strong grasping forces were observed, attributed to stored elastic energy.
  • Grippers achieved zero-magnetic field holding capacities up to 20 times their weight.
  • Analytical models accurately predicted actuator behavior.

Conclusions:

  • The developed bioinspired design enables efficient, low-field magnetic actuation with autonomous shape recovery.
  • Stored elastic energy is crucial for high-speed shape recovery and significant grasping capabilities.
  • The design allows for customization of soft magnetic actuators in various shapes and sizes for diverse applications.