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Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
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The Dynamic Mortise-and-Tenon Interlock Assists Hydrated Soft Robots Toward Off-Road Locomotion.

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Research (Washington, D.C.)
|September 18, 2024
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Summary

Inspired by inchworms, researchers developed a thermoresponsive hydrogel actuator capable of multidimensional locomotion on complex terrains. This soft robotic material demonstrates efficient energy transfer for activating static loads, paving the way for advanced biomimetic devices.

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Area of Science:

  • Soft Matter Physics
  • Robotics
  • Biomaterials

Background:

  • Natural locomotion relies on controlled soft tissue deformation for environmental interaction.
  • Hydrogels offer versatile biomimetic morphing capabilities but struggle with locomotion on complex terrains.

Purpose of the Study:

  • To develop a hydrogel actuator capable of locomotion on complex terrains.
  • To explore the potential of hydrogel actuators as biomimetic motors.

Main Methods:

  • An isotropic thermoresponsive hydrogel was transformed into an anisotropic actuator via interfacial diffusion polymerization.
  • A multisection structure was created to achieve adaptive deformation with diverse degrees of freedom.
  • The actuator's interaction with terrain generated a dynamic mortise-and-tenon interlock for locomotion.

Main Results:

  • The hydrogel actuator demonstrated continual multidimensional locomotion on artificial and natural rough substrates.
  • The actuators functioned as hydrogel motors, activating static cargos to overcome complex terrains.
  • The system showed potential for biomimetic mechanical discoloration devices.

Conclusions:

  • The developed hydrogel actuator design principle enables locomotion on challenging terrains.
  • This control strategy offers potential for advancements in deformable materials, soft robots, and biomimetic devices.