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Related Concept Videos

Unsymmetric Bending01:18

Unsymmetric Bending

704
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...
704
Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

488
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...
488
Bending of Material: Problem Solving01:09

Bending of Material: Problem Solving

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In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
413
Bending and Torsional Moments01:20

Bending and Torsional Moments

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Bending and torsional moments are two fundamental concepts in structural engineering. They play an important role in understanding the behavior of materials and structures under different loading conditions.
The reaction developed in a structural element when subjected to an external force causes the element to bend. When a structural element bends upwards, it creates compressive normal forces on the top and tensile normal forces on the bottom, resulting in a couple that determines the bending...
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Bending01:10

Bending

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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...
716
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

738
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
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Updated: Dec 14, 2025

Bioinspired Soft Robot with Incorporated Microelectrodes
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Bioinspired Soft Robot with Incorporated Microelectrodes

Published on: February 28, 2020

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Bone-Inspired Bending Soft Robot.

Saeed Hashemi1, Darrin Bentivegna2, William Durfee1

  • 1Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota, USA.

Soft Robotics
|July 24, 2020
PubMed
Summary
This summary is machine-generated.

Bone-inspired soft robots with embedded structures offer improved stiffness and controllability for applications like robotic hands. Their predictable movement enhances performance in puppetry robots with haptic feedback.

Keywords:
bone-inspired soft robotfiber-reinforced bending soft robotgrasping handpuppeteering

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Area of Science:

  • Robotics
  • Mechanical Engineering
  • Biomimicry

Background:

  • Bending soft robots require structural predictability for applications like grasping hands.
  • Traditional fiber-reinforced soft robots lack sufficient stiffness and controllability.
  • Enhancing soft robot performance necessitates novel structural designs.

Purpose of the Study:

  • To develop and evaluate bone-inspired soft robot fingers for improved performance.
  • To create mathematical models for predicting stiffness, natural frequency, and trajectory planning.
  • To compare the dynamic performance of bone-inspired soft robots with traditional designs.

Main Methods:

  • Manufacturing of soft robot fingers with embedded, bone-like structures.
  • Development of a fourth-order lumped mass-spring-damper model for dynamic analysis.
  • Creation of a trajectory planning model based on segmented bone lengths.
  • Experimental validation of the mathematical models using prototype robots.

Main Results:

  • The bone-inspired soft robots exhibited higher natural frequency, lower phase shift, and increased stiffness compared to fiber-reinforced robots.
  • The developed models accurately predicted natural frequency (max 18% error) and trajectory paths.
  • Dynamic performance was found to be independent of the internal media (air/water) and pressure.
  • The trajectory model demonstrated that robot path is controllable via bone segment length adjustments.

Conclusions:

  • Bone-inspired soft robots offer superior stiffness, controllability, and predictable dynamics over traditional designs.
  • Mathematical modeling provides a powerful tool for predicting performance and designing desired trajectories.
  • These findings pave the way for more sophisticated and reliable soft robotic applications, including advanced grasping hands.