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Related Concept Videos

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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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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Parallel Microcracks-based Ultrasensitive and Highly Stretchable Strain Sensors.

Morteza Amjadi1, Mehmet Turan1, Cameron P Clementson1,2

  • 1Physical Intelligence Department, Max Planck Institute for Intelligent Systems , Heisenberstr. 3, 70569, Stuttgart, Germany.

ACS Applied Materials & Interfaces
|February 5, 2016
PubMed
Summary

Highly sensitive and stretchable strain sensors were developed using reversible microcracks in graphite thin films. These wearable sensors offer high performance for applications ranging from physiological monitoring to soft robotics.

Keywords:
human motion detectionparallel microcracksskin-attachable sensorsstrain sensorswearable sensors

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Wearable strain sensors are increasingly in demand for diverse applications.
  • Achieving high sensitivity and stretchability simultaneously in strain sensors remains a significant challenge.
  • Existing sensors often compromise between sensitivity and stretchability.

Purpose of the Study:

  • To develop highly sensitive and stretchable strain sensors.
  • To investigate the role of reversible microcrack formation in composite thin films for strain sensing.
  • To explore the potential of these sensors in various real-world applications.

Main Methods:

  • Fabrication of composite thin films by coating graphite on elastomer substrates.
  • Controlled generation of parallel microcracks within the graphite thin films.
  • Characterization of sensor performance, including gauge factor and stretchability, with varying microcrack lengths.

Main Results:

  • Sensors with short microcracks exhibited high gauge factors (up to 522.6) and stretchability (≥ 50%).
  • Sensors with long microcracks demonstrated ultrahigh sensitivity (up to 11,344) with limited stretchability (≤ 50%).
  • Demonstrated effective strain sensing for human physiological activity, motion capturing, vibration detection, pressure sensing, and soft robotics.

Conclusions:

  • Reversible microcrack formation in graphite/elastomer composite films enables the development of high-performance strain sensors.
  • Tunable microcrack characteristics allow for tailored sensor performance, balancing sensitivity and stretchability.
  • The developed sensors show significant promise for advanced wearable electronics and robotics applications.