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Related Concept Videos

Bending01:10

Bending

1.3K
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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Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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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...
714
Unsymmetric Bending01:18

Unsymmetric Bending

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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...
987
Bending of Curved Members - Neutral Surface01:16

Bending of Curved Members - Neutral Surface

645
In curved beams, unlike straight beams, the stress distribution across the cross-section is not uniform due to the beam's curvature. This non-uniformity arises because the neutral axis, where stress is zero, does not align with the centroid of the section. In a curved beam, the strain varies along the section as a function of the distance from the neutral axis.
Consider the curved member described in the previous lesson. According to Hooke's law, which relates stress to strain within the...
645
Dynamics Of Circular Motion: Applications01:17

Dynamics Of Circular Motion: Applications

7.8K
Suppose a car moves on flat ground and turns to the left. The centripetal force causing the car to turn in a circular path is due to friction between the tires and the road. For this, a minimum coefficient of friction is needed, or the car will move in a larger-radius curve and leave the roadway. Let's now consider banked curves, where the slope of the road helps in negotiating the curve. The greater the angle of the curve, the faster one can take the curve. It is common for race tracks for...
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Related Experiment Video

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Author Spotlight: Enhancing Accuracy and Reproducibility in Whole Bone Bending Tests
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Author Spotlight: Enhancing Accuracy and Reproducibility in Whole Bone Bending Tests

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Bending rules for animal propulsion.

Kelsey N Lucas1, Nathan Johnson2, Wesley T Beaulieu3

  • 11] Biology and Environmental Sciences, Roger Williams University, Bristol, Rhode Island 02809, USA [2].

Nature Communications
|February 20, 2014
PubMed
Summary
This summary is machine-generated.

Animal wings and fins bend predictably during efficient movement, offering design insights. This study reveals a limited, characteristic range of motion for flexible propulsors across diverse species.

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Area of Science:

  • Biomechanics
  • Fluid Dynamics
  • Robotics

Background:

  • Animal locomotion, including wings and fins, exhibits high efficiency attributed to propulsor flexibility.
  • Current bio-inspired designs face challenges due to a lack of understanding regarding optimal flexibility and design principles.
  • Contradictory performance results hinder the development of effective flexible propulsor systems.

Purpose of the Study:

  • To investigate the characteristic bending patterns of natural propulsors during steady-state motion.
  • To establish empirical design criteria for flexible propulsors based on natural examples.
  • To provide a framework for understanding and designing efficient, flexible propulsors.

Main Methods:

  • Analysis of steady-state motion in a wide range of animals, from insects to marine mammals.
  • Observation of propulsor (wings and fins) bending patterns in both air and water environments.
  • Identification of predictable ranges and characteristic motions in natural propulsor designs.

Main Results:

  • Natural propulsors exhibit similar bending patterns within a highly predictable range during steady-state locomotion.
  • This convergence suggests a limited design space for optimal flexible propulsor performance.
  • Empirical data derived from diverse animal species provide consistent design criteria.

Conclusions:

  • Flexible propulsor design can be guided by the observed, convergent strategies in nature.
  • Understanding the characteristic motions of animal propulsors offers a new paradigm for engineering efficient artificial systems.
  • This research bridges the gap between biological locomotion and the design of advanced flexible propulsors.