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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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Magnetic Field Due To A Thin Straight Wire01:28

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Magnetic Field Due to Two Straight Wires01:18

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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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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Measurements of Strain01:27

Measurements of Strain

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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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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Related Experiment Video

Updated: Dec 17, 2025

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
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Model for Wireless Magnetoelastic Strain Sensors.

Eduardo S Bastos1, Cristina Bormio-Nunes2, Thomas G R Clarke1

  • 1Laboratório de Metalurgia Física, Universidade Federal do Rio Grande do Sul, Porto Alegre 91501-970, Brazil.

Sensors (Basel, Switzerland)
|June 27, 2020
PubMed
Summary

This study presents a novel magnetoelastic strain sensor utilizing the delta E (ΔE) effect. The sensor accurately measures strain in steel structures, showing potential for remote monitoring applications.

Keywords:
Fe–Al–BMetglas 2826MB3magnetoelasticmagnetostrictionsteelstrain sensor

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Area of Science:

  • Materials Science
  • Physics
  • Engineering

Background:

  • Magnetoelastic sensors leverage the ΔE effect for strain measurement.
  • Developing robust sensors for real-world applications is crucial.

Purpose of the Study:

  • To describe a magnetoelastic strain sensor based on the ΔE effect.
  • To investigate materials for sensor construction and performance.
  • To model sensor behavior for accurate strain prediction.

Main Methods:

  • Utilized a polycrystalline Fe-Al-B alloy as the magnetoelastic transducer.
  • Employed a field-annealed Metglas 2826MB3 strip as the resonator.
  • Developed a simulation model to correlate resonant frequency with deformation.
  • Tested sensor performance on brass plates and SAE 1010 steel rods.

Main Results:

  • The sensor demonstrated a resonant frequency shift of ~7 kHz for 1100 ppm strain on a steel rod.
  • A simulation model accurately predicted resonant frequency versus deformation curves.
  • The sensor's design is suitable for remote monitoring of steel surfaces.

Conclusions:

  • The developed magnetoelastic strain sensor shows high sensitivity and accuracy.
  • The sensor is particularly well-suited for monitoring steel components in harsh environments, like marine risers.