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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.8K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Strain and Elastic Modulus01:15

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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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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...
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Stress-Strain Diagram01:10

Stress-Strain Diagram

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A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
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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

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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.
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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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Compressive and tensile strain sensing using a polymer planar Bragg grating.

M Rosenberger, S Hessler, S Belle

    Optics Express
    |March 26, 2014
    PubMed
    Summary

    Researchers developed a novel polymer planar Bragg grating sensor for accurately measuring both compressive and tensile mechanical strain. This advancement enables, for the first time, compressive strain detection using polymer Bragg gratings.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Polymer Science

    Background:

    • Strain sensors are crucial for structural health monitoring and mechanical testing.
    • Polymer-based optical sensors offer advantages like flexibility and cost-effectiveness.
    • Existing Bragg grating sensors often lack the capability for compressive strain measurement.

    Purpose of the Study:

    • To develop and characterize a polymer planar Bragg grating sensor for measuring both tensile and compressive mechanical strain.
    • To demonstrate the novel application of polymer Bragg gratings for compressive strain detection.
    • To investigate the sensor's sensitivity, reproducibility, and hysteresis.

    Main Methods:

    • Fabrication of a planar waveguide with an integrated Bragg grating in bulk Polymethylmethacrylate using a combined amplitude and phase mask technique.
    • Butt coupling of a single-mode optical fiber to the planar structure.
    • Experimental measurement and analysis of sensor response to applied tensile and compressive strains.

    Main Results:

    • Successful fabrication of a polymer planar Bragg grating sensor.
    • Demonstration of simultaneous measurement of both tensile and compressive strain.
    • First-time reporting of compressive strain measurements using a polymer Bragg grating.
    • Characterization of the sensor's sensitivity, reproducibility, and hysteresis.

    Conclusions:

    • The developed polymer planar Bragg grating sensor is effective for measuring both tensile and compressive mechanical strain.
    • This technology represents a significant advancement, particularly for compressive strain detection in polymer-based optical sensors.
    • The sensor shows potential for various applications requiring robust and versatile strain monitoring.