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Related Concept Videos

Unsymmetric Bending01:18

Unsymmetric Bending

710
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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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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Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

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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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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...
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Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

556
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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Bending01:10

Bending

732
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...
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Related Experiment Video

Updated: Dec 18, 2025

Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery
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A lobster-inspired bending module for compliant robotic applications.

Yaohui Chen1, Hoam Chung, Bernard Chen

  • 1Department of Mechanical and Aerospace Engineering, Monash University, VIC 3168, Austraila.

Bioinspiration & Biomimetics
|June 13, 2020
PubMed
Summary

This study presents a lobster-inspired soft actuator module capable of variable stiffness and precise angular control. This adaptable robotic component can be reconfigured for diverse tasks, from delicate handling to heavy lifting.

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Area of Science:

  • Robotics
  • Biomimetics
  • Materials Science

Background:

  • Robots require adaptable actuators for tasks with varying force and precision needs.
  • Conventional rigid actuators excel in precision but lack compliance.
  • Soft actuators offer flexibility but often compromise on precision and force.

Purpose of the Study:

  • To develop a novel lobster-inspired bending module for robots.
  • To achieve compliant actuation with enhanced torque output and reconfigurability.
  • To enable accurate angular position control with variable stiffness.

Main Methods:

  • Designing a bending module with antagonistic soft chambers and rigid shells, mimicking lobster joint anatomy.
  • Developing theoretical models to predict and analyze module performance.
  • Conducting experiments to evaluate independent control of bending angle and stiffness.
  • Implementing a control strategy for angle control and stiffness adaptation.

Main Results:

  • The developed module demonstrates accurate angular position control and variable stiffness.
  • Independent adjustment of bending angle and stiffness was experimentally validated.
  • Reconfigurable robotic fingers were assembled, showcasing diverse motion profiles.
  • Robotic grippers successfully handled both delicate and heavy objects.

Conclusions:

  • The lobster-inspired bending module offers a versatile solution for robotic applications requiring adaptable force and precision.
  • The module's reconfigurable nature and variable stiffness enhance its applicability in complex manipulation tasks.
  • This biomimetic design advances the development of robots capable of performing a wider range of tasks efficiently and safely.