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Related Concept Videos

Relation Between the Distributed Load and Shear01:23

Relation Between the Distributed Load and Shear

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Understanding the relationship between the distributed load and shear force in structural analysis is crucial for analyzing beams subjected to various loading conditions. Consider the case of a beam experiencing a distributed load, two concentrated loads, and a couple moment.
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Fascicle Arrangement in Skeletal Muscles01:25

Fascicle Arrangement in Skeletal Muscles

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Fascicles are bundles of muscle fibers in a skeletal muscle. Muscle fascicle arrangement is directly associated with the power and range of motion of various muscles. The configuration of these fascicles can vary, leading to different functional outcomes.
The four primary types of muscle based on fascicle arrangement are:
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Shear Diagram01:27

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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...
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Shearing Stress01:19

Shearing Stress

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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.
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Shearing Strain01:20

Shearing Strain

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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...
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Normal and Shear Force01:14

Normal and Shear Force

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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...
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Related Experiment Video

Updated: Feb 7, 2026

Author Spotlight: Advancing Tendon Research by Developing Mouse Assembloids to Understand Cellular Mechanisms
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Author Spotlight: Advancing Tendon Research by Developing Mouse Assembloids to Understand Cellular Mechanisms

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Shear loads induce cellular damage in tendon fascicles.

Jaclyn Kondratko-Mittnacht1, Roderic Lakes2, Ray Vanderby3

  • 1Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, 53705 WI, USA; Department of Orthopedics and Rehabilitation, University of Wisconsin-Madison, Madison, 53705 WI, USA.

Journal of Biomechanics
|July 12, 2015
PubMed
Summary

Shear loading in tendons, even after injury, maintains significant strength. However, this loading can cause widespread cell death, potentially hindering tendon healing and remodeling.

Keywords:
Cellular viabilityMechanicsShearTendonViscoelasticity

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Area of Science:

  • Biomechanical Engineering
  • Musculoskeletal Biology
  • Cellular Mechanics

Background:

  • Tendons are crucial for musculoskeletal function, transmitting muscle forces to bone.
  • Tendon structure is anisotropic and primarily composed of type I collagen.
  • Pathological conditions can introduce shear loading, impacting cellular function.

Purpose of the Study:

  • To investigate the mechanical properties and cellular response of rat tail tendon fascicles under varying laceration conditions.
  • To determine the impact of shear-lag as a primary loading mechanism on tendon strength and cellular viability.

Main Methods:

  • Dissection of rat tail tendon fascicles into intact, single laceration (transverse), and double laceration (shear-inducing) groups.
  • Mechanical testing to evaluate elastic properties (peak load, steady state load, stiffness).
  • Assessment of cellular viability following mechanical loading.

Main Results:

  • Elastic properties significantly decreased from intact to single to double laceration groups.
  • Remarkably, 45% of intact strength was retained when shear was the primary load transfer mechanism.
  • Cellular viability decreased in laceration groups, with cell death concentrated in planes of high shear, extending beyond the injury site.

Conclusions:

  • Tendon fascicles exhibit notable strength retention under shear loading, even with injury.
  • Shear loading induces significant cellular damage and necrosis, potentially compromising tendon repair and remodeling.
  • Understanding these biomechanical and cellular responses is critical for managing tendon injuries.