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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Highly Integrated Multi-Material Fibers for Soft Robotics.

Andreas Leber1, Chaoqun Dong1, Stella Laperrousaz1

  • 1Institute of Materials, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland.

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Summary
This summary is machine-generated.

Soft robotic fibers enable advanced biomedical devices through multi-material thermal drawing. This new method allows for complex, multifunctional soft robots with enhanced actuation and sensing capabilities for minimally invasive procedures.

Keywords:
multi-material fiberssensing and actuationsoft roboticssteerable catheters and endoscopesthermal drawing

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Area of Science:

  • Materials Science
  • Robotics
  • Biomedical Engineering

Background:

  • Soft robots offer enhanced safety for minimally invasive procedures.
  • Current limitations in soft material processing restrict soft robot capabilities, including size, aspect ratio, and design complexity.
  • A need exists for advanced manufacturing techniques to overcome these limitations.

Purpose of the Study:

  • Introduce multi-material thermal drawing as a platform for fabricating advanced soft robotic fibers.
  • Demonstrate the creation of fibers with multiple actuation and sensing capabilities.
  • Showcase the potential for complex, high-aspect-ratio soft robotic components.

Main Methods:

  • Utilized multi-material thermal drawing with various thermoplastic and elastomeric materials.
  • Designed intricate fiber architectures with outer diameters of 700 µm and aspect ratios up to 10^3.
  • Fabricated continuous fiber lengths of tens of meters.
  • Integrated modular tendon-driven mechanisms, optical guides, electrical wires, and microfluidic channels.

Main Results:

  • Successfully fabricated soft robotic fibers with adaptable actuation performance based on material selection.
  • Demonstrated complex internal architectures and high aspect ratios.
  • Achieved multifunctionality through integrated components, enabling 3D motion, sensing, and fluid/tool delivery.
  • Showcased the scalability of the fabrication process.

Conclusions:

  • Multi-material thermal drawing is a viable and scalable platform for producing advanced soft robotic fibers.
  • These fibers possess multiple actuation and sensing modalities, paving the way for next-generation biomedical devices.
  • The demonstrated capabilities significantly enhance the potential of soft robots in minimally invasive applications.