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Related Concept Videos

Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

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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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Related Experiment Video

Updated: Oct 15, 2025

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A Biologically Inspired Ring-Shaped Soft Pneumatic Actuator for Large Deformations.

Ryman Hashem1,2, Shahab Kazemi1,2, Martin Stommel2,3

  • 1Department of Mechanical and Mechatronics Engineering, The University of Auckland, Auckland, New Zealand.

Soft Robotics
|October 27, 2021
PubMed
Summary

Researchers developed a ring-shaped soft pneumatic actuator (RiSPA) to mimic stomach contractions. This soft actuator technology advances biomimicry for digestive system research and robotic applications.

Keywords:
contraction dynamics and controllarge contractionsoft ring actuationsoft robotics

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Area of Science:

  • Robotics
  • Biomimicry
  • Mechanical Engineering

Background:

  • Mimicking the stomach's peristaltic contractions is complex for soft actuator design.
  • Understanding digestive system mechanics requires advanced modeling and physical testing.
  • Existing soft actuators struggle to replicate organ-specific contractile behaviors.

Purpose of the Study:

  • To propose and validate a novel ring-shaped soft pneumatic actuator (RiSPA) for mimicking digestive tract contractions.
  • To develop and test a control system for precise, biomimetic actuation.
  • To bridge the gap between computational modeling and experimental validation of soft robotic systems.

Main Methods:

  • Designed a ring-shaped soft pneumatic actuator (RiSPA) with embedded bellow actuators.
  • Integrated a sensory system with range sensors for measuring contractions.
  • Developed kinematic and dynamic models, applying a state feedback control algorithm.
  • Validated simulation results through experimental testing with sinusoidal signals.

Main Results:

  • RiSPA demonstrated controllable symmetrical and asymmetrical contractions, analogous to the human stomach.
  • Experimental results validated the predictive accuracy of the simulation and control system.
  • The actuator successfully replicated peristaltic wave-like contractions.

Conclusions:

  • The proposed RiSPA effectively mimics human stomach contractions, validating simulation and control strategies.
  • This soft actuator technology shows promise for applications in digestive system research and bio-inspired robotics.
  • RiSPA's capabilities extend to imitating esophagus and intestine contractions.