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Related Concept Videos

Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
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Rapid Manufacturing of Thin Soft Pneumatic Actuators and Robots
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Soft material for soft actuators.

Aslan Miriyev1, Kenneth Stack1, Hod Lipson2

  • 1Department of Mechanical Engineering, Columbia University in the City of New York, 500W 120th St., Mudd 220, New York, NY, 10027, USA.

Nature Communications
|September 21, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel soft composite material for electrically driven soft actuators. This material achieves high strain (900%) and stress (1.3 MPa) using liquid-vapor transitions, overcoming limitations of current soft robotic technologies.

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Area of Science:

  • Soft robotics
  • Materials science
  • Actuator technology

Background:

  • Developing self-contained, electrically driven soft actuators with high strain density is a significant challenge in soft robotics.
  • Existing technologies like electroactive polymers (high voltage), shape memory alloys (low strain), and fluidic elastomer actuators (external components) have practical limitations for untethered applications.

Purpose of the Study:

  • To introduce a novel soft composite material for self-contained, electrically driven soft actuators.
  • To demonstrate a material capable of achieving high strain and stress density, overcoming limitations of current technologies.

Main Methods:

  • Fabrication of a single soft robust composite material combining a polymeric matrix with liquid-vapor transition properties.
  • Characterization of the material's strain, stress, and density.

Main Results:

  • The developed material achieves a high strain of up to 900% and high stress of up to 1.3 MPa.
  • The material exhibits low density (0.84 g cm⁻³) and is cost-effective (approx. 3 cents per gram).
  • The composite is simple to fabricate and environmentally friendly.

Conclusions:

  • This novel soft composite material offers a promising solution for creating practical, electrically driven, entirely soft robots.
  • The material's properties enable high performance in a self-contained, robust, and cost-effective actuator design.