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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

1.8K
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

Strain and Elastic Modulus

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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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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

472
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...
472

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Production of a Strain-Measuring Device with an Improved 3D Printer
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Stretchable Strain Sensor with Small but Sufficient Adhesion to Skin.

Takaaki Nishikawa1, Hisaya Yamane1, Naoji Matsuhisa2,3,4

  • 1Department of Mechanical Engineering, Keio University, Kanagawa, Yokohama 223-8522, Japan.

Sensors (Basel, Switzerland)
|February 28, 2023
PubMed
Summary
This summary is machine-generated.

This study demonstrates stretchable strain sensors using liquid metal (eutectic gallium-indium alloy; E-GaIn) and silicone rubber (Ecoflex). These sensors effectively monitor human motion, including joint movements and respiration, due to their high stretchability and skin adhesion.

Keywords:
adhesionflexible sensorhuman motionliquid metalsilicone rubberstrain sensor

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Wearable Technology

Background:

  • Development of advanced materials for wearable electronics is crucial for non-invasive health monitoring.
  • Existing strain sensors often lack the necessary stretchability and biocompatibility for continuous human motion tracking.

Purpose of the Study:

  • To demonstrate novel stretchable strain sensors utilizing liquid metal and silicone rubber.
  • To evaluate the mechanical and electrical properties of these sensors for human motion monitoring applications.

Main Methods:

  • Fabrication of stretchable strain sensors using eutectic gallium-indium (E-GaIn) liquid metal and Ecoflex silicone rubber.
  • Experimental evaluation of sensor's mechanical properties, including stretchability up to 100%.
  • Assessment of adhesion force to skin and performance in monitoring physiological movements.

Main Results:

  • The E-GaIn and Ecoflex-based sensors exhibit excellent stretchability (100%) and sufficient skin adhesion for practical use.
  • The sensors accurately captured various human motions, including joint movements, facial expressions, and respiration.
  • Mechanical and electrical properties were characterized, confirming sensor reliability.

Conclusions:

  • The developed stretchable strain sensors offer a promising solution for non-invasive human motion monitoring.
  • The combination of E-GaIn and Ecoflex provides a flexible, deformable, and adhesive platform for wearable sensing.
  • This technology has potential applications in healthcare, sports, and human-computer interaction.