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Related Concept Videos

Shear Diagram01:27

Shear Diagram

1.8K
In the study of beam mechanics, shear diagrams play a crucial role in understanding the distribution of shear forces along the length of a beam. Consider a beam AB that is supported at both ends and subjected to perpendicular loads.
First, a free-body diagram of the beam is drawn, representing all the external forces and internal reactions acting on the beam. One can calculate the reaction forces at each support by employing the equilibrium equations of force and moment. The vertical component...
1.8K
Shear on the Horizontal Face of a Beam Element01:16

Shear on the Horizontal Face of a Beam Element

599
To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
599
Normal and Shear Force01:14

Normal and Shear Force

3.8K
When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
3.8K
Shearing Strain01:20

Shearing Strain

1.8K
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
1.8K
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

593
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
593
Shearing Stress01:18

Shearing Stress

2.4K
Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
2.4K

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Related Experiment Video

Updated: Mar 23, 2026

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
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Haptic Edge Detection Through Shear.

Jonathan Platkiewicz1, Hod Lipson2, Vincent Hayward3

  • 1The City College of New York, The City University of New York, Department of Mathematics, New York, NY 10031, USA.

Scientific Reports
|March 25, 2016
PubMed
Summary
This summary is machine-generated.

This study suggests shear strain, not pressure, is key for tactile sensors to detect shape. Using a robot gripper, researchers confirmed shear strain accurately identifies edges, regardless of pressure, improving tactile sensing technology.

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Area of Science:

  • Robotics
  • Biophysics
  • Materials Science

Background:

  • Tactile sensors traditionally rely on pressure measurement.
  • Inferring pressure distribution from sensor deformation is challenging.
  • Optimal strain components for tactile sensing remain debated.

Purpose of the Study:

  • To propose and validate shear strain as a superior metric for shape-related tactile information.
  • To investigate the role of strain components in tactile sensing.
  • To enhance the design of tactile sensors and understand mammalian somatosensory processing.

Main Methods:

  • Contact mechanics analysis of a haptic probe's elastic behavior.
  • Empirical validation using a jamming-based robot gripper as a tactile sensor.
  • Analysis of shear strain versus normal strain for edge detection.

Main Results:

  • Shear strain sensing enables robust edge detection in haptic probes.
  • Shear strain processing provides accurate edge information invariant to pressure.
  • Experimental results align with contact mechanics predictions.

Conclusions:

  • Shape-related tactile information is better recovered from shear strain than normal strain.
  • Shear strain is a more informative component for tactile sensing.
  • Findings impact tactile sensor design and understanding of somatosensory processing.