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Related Concept Videos

Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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...
Flexural Stress01:16

Flexural Stress

When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
Shearing Stress01:18

Shearing Stress

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.

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Related Experiment Video

Updated: Jun 12, 2026

Fabrication and Testing of Microfluidic Optomechanical Oscillators
09:10

Fabrication and Testing of Microfluidic Optomechanical Oscillators

Published on: May 29, 2014

Intermodal coupling in an optical fiber using periodic stress.

S J Garth

    Applied Optics
    |June 16, 2010
    PubMed
    Summary

    Researchers demonstrate a broadband, polarization-sensitive device for efficient mode coupling in bimodal optical fibers. This technique achieves 96% coupling efficiency with minimal insertion loss, crucial for optical communication and sensing applications.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Few-mode optical fibers offer potential for advanced information and sensor applications.
    • Efficient and selective coupling into different fiber modes is critical for device performance.

    Purpose of the Study:

    • To analyze a device for coherent coupling between the first- and second-order modes in bimodal optical fibers.
    • To evaluate the broadband and polarization characteristics of the proposed coupling mechanism.

    Main Methods:

    • Theoretical analysis of a bimodal optical fiber subjected to periodic stress.
    • Experimental validation of theoretical predictions.

    Main Results:

    • The device enables coherent coupling between fiber modes with 96% efficiency.

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    Fabrication and Testing of Microfluidic Optomechanical Oscillators
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    Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
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  • The coupling mechanism exhibits broadband characteristics.
  • The device is sensitive to polarization.

    • Conclusions:

    • Periodic stressing of bimodal optical fibers is an effective method for efficient mode coupling.
    • The demonstrated device shows promise for practical applications in optical communications and sensing.
    • The study validates theoretical models with experimental data.