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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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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
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Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
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Lightweight Pneumatically Elastic Backbone Structure with Modular Construction and Nonlinear Interaction for Soft

Yang Yang1,2,3, Jiewen Lai1, Chaochao Xu2,4

  • 1Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong, China.

Soft Robotics
|August 25, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a lightweight pneumatically elastic backbone structure (PEBS) for soft actuators. The novel design addresses system instability and nonlinear interactions, enabling precise control for force-sensitive tasks.

Keywords:
biomedical engineeringnonlinear interactionsnumerical simulationpneumatic actuationsoft robots

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Area of Science:

  • Robotics
  • Materials Science
  • Mechanical Engineering

Background:

  • Soft robots offer unique advantages in adaptability and control for force-sensitive tasks.
  • System instability and nonlinear interactions are key challenges in lightweight soft actuator design.
  • Existing soft actuators require further investigation into their control and stability.

Purpose of the Study:

  • To present a design principle for a lightweight pneumatically elastic backbone structure (PEBS) for modular soft actuators.
  • To investigate and overcome system instability and nonlinear interaction phenomena in soft actuators.
  • To validate the accuracy and applicability of the developed theoretical and numerical models.

Main Methods:

  • Designed and prototyped a lightweight (<80g) soft actuator using a pneumatically elastic backbone structure (PEBS) with modular construction.
  • Conducted experimental, numerical, and parametric studies on the nonlinear interactions and system instability.
  • Derived and validated a theoretical nonlinear model and a numerical model against experimental results.

Main Results:

  • Developed a lightweight soft actuator prototype (<80g) capable of bending motions with significant output forces (∼20 times self-weight).
  • Achieved satisfactory agreement between experimental, numerical, and theoretical models, validating the numerical model's accuracy.
  • Demonstrated accurate controllability, safety, modularization, and collaborative abilities through applications in a soft laryngoscope, robotic arm, and remote surgery system.

Conclusions:

  • The proposed PEBS design principle offers a viable solution for controlling system instability and nonlinear interactions in soft actuators.
  • The validated nonlinear model provides a powerful tool for the design and optimization of soft actuators.
  • The PEBS demonstrates significant potential for diverse applications in soft robotics, including medical devices and collaborative robotics.