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Related Concept Videos

Unsymmetric Bending01:18

Unsymmetric Bending

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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
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Plastic Deformation in Circular Shafts01:20

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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Bending of Curved Members - Neutral Surface01:16

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In curved beams, unlike straight beams, the stress distribution across the cross-section is not uniform due to the beam's curvature. This non-uniformity arises because the neutral axis, where stress is zero, does not align with the centroid of the section. In a curved beam, the strain varies along the section as a function of the distance from the neutral axis.
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Hydrostatic Pressure Force on a Curved Surface01:04

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Curvilinear Kirigami Skins Let Soft Bending Actuators Slither Faster.

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Summary

Soft snake robots achieve enhanced locomotion using novel kirigami skins. This anisotropic friction design boosts robot velocity over fivefold, mimicking natural snakeskin for efficient movement.

Keywords:
bioinspirationbioroboticskirigamilocomotionmechanical designmechanical metamaterialssoft robotics

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Area of Science:

  • Robotics
  • Materials Science
  • Biomechanics

Background:

  • Locomotion in soft snake robots relies heavily on environmental friction.
  • Natural snakeskin exhibits frictional anisotropy, enabling selective surface engagement and propulsion.
  • Existing soft snake robots lack sufficient lateral resistance for efficient slithering gaits.

Purpose of the Study:

  • To design and evaluate a novel kirigami-based skin for soft snake robots.
  • To enhance propulsive force generation through anisotropic friction.
  • To improve the overall locomotion speed of soft snake robots.

Main Methods:

  • Developed kirigami lattices with curvilinear cuts for 3D structures.
  • Integrated kirigami skins with soft bending actuators.
  • Tested friction anisotropy by varying scale orientation relative to surface asperities.
  • Measured robot velocity with and without the novel skin.

Main Results:

  • Kirigami skin design generates high lateral friction upon engagement.
  • Achieved lateral to cranial anisotropic friction ratios exceeding 4.
  • Soft snake robot velocity increased more than fivefold compared to designs without the skin.

Conclusions:

  • Kirigami lattices effectively mimic snakeskin's frictional anisotropy.
  • The proposed skin significantly enhances soft snake robot locomotion.
  • This approach offers a promising pathway for developing more effective bio-inspired robots.