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Related Concept Videos

Bending01:10

Bending

915
Pure bending is a fundamental concept in structural mechanics, essential for understanding how materials deform under symmetrical loads without direct forces. Pure bending occurs when prismatic members, such as beams, are subjected to equal and opposite moments that induce bending. The phenomenon is crucial as it allows for predicting stress distributions without the influence of axial or shear forces.
In pure bending, the bending stress in a beam is calculated based on the bending moment and...
915
Symmetric Member in Bending01:07

Symmetric Member in Bending

605
In the study of the mechanics of materials, analyzing the behavior of prismatic members under opposing couples is crucial for understanding internal stress distributions, which are essential for structural design. When subjected to couples, a prismatic member experiences internal forces that maintain equilibrium. A couple, characterized by two equal and opposite forces, creates a moment but no resultant force. The internal forces at any section cut of the member must balance these external...
605
Unsymmetric Bending01:18

Unsymmetric Bending

845
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...
845
Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

617
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
617
Bending Moment Diagram01:30

Bending Moment Diagram

2.6K
A bending moment diagram is a graphical representation of the bending moments experienced by a beam under load along the beam length. It is an essential tool for engineers and designers to analyze structures and ensure they can withstand applied forces. The steps to create the bending moment diagram for a beam are listed below.
Determine reactive forces and couple moments: Calculate all the reactive forces and couple moments acting on the beam. In certain cases, when the beam is inclined at an...
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Residual Stresses in Bending01:18

Residual Stresses in Bending

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In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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Related Experiment Video

Updated: Feb 9, 2026

Rapid Manufacturing of Thin Soft Pneumatic Actuators and Robots
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A Reconfigurable Pneumatic Bending Actuator with Replaceable Inflation Modules.

Rainier Natividad1,2, Manuel Del Rosario2,3, Peter C Y Chen2,3

  • 11 Department of Biomedical Engineering, National University of Singapore , Singapore, Singapore .

Soft Robotics
|June 9, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a modular, reconfigurable pneumatic actuator for soft robotics. Its design allows for easy customization of bending trajectories and torque, demonstrating durability over 100,000 cycles.

Keywords:
3D printed actuatorModular Robotic Systemsbiomimeticsfabric robotspneumatic bending actuatorreconfigurable bending

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Area of Science:

  • Soft Robotics
  • Actuator Design
  • Modular Robotics

Background:

  • Traditional actuators lack adaptability.
  • Soft robotics offers novel solutions for flexible manipulation.
  • Modularity is key to enhancing robotic system versatility.

Purpose of the Study:

  • To develop a fully reconfigurable pneumatic bending actuator.
  • To investigate the impact of modular geometry on actuator performance.
  • To assess the durability of the novel actuator design.

Main Methods:

  • Fabrication of modular, heat-sealed fabric inflation modules.
  • Manufacturing of a flexible plastic spine using 3D printing.
  • Assembly and disassembly of components without external tools.
  • Analysis of steady-state and dynamic characteristics under varying pressure inputs.

Main Results:

  • The modular actuator allows for easy reconfiguration of bending trajectories and torque output.
  • Combining modules with different geometries enables diverse bending structures.
  • Actuator torque is directly proportional to applied pressure.
  • The actuator maintained performance after 100,000 inflation/deflation cycles.

Conclusions:

  • The developed modular pneumatic actuator offers unprecedented reconfigurability for soft robotic applications.
  • The design is robust and durable, suitable for demanding operational cycles.
  • This modular approach significantly advances the field of adaptable soft robotic systems.