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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.3K
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...
2.3K
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

4.3K
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...
4.3K
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

333
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...
333
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

659
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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Related Experiment Video

Updated: Oct 26, 2025

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
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Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

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Tuning Strain Sensor Performance via Programmed Thin-Film Crack Evolution.

Juan Zhu1, Xiaodong Wu1, Jasmine Jan1

  • 1Arias Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States.

ACS Applied Materials & Interfaces
|August 3, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel programmable cracking technology for highly sensitive and stretchable strain sensors. This breakthrough enables precise control over sensor performance for diverse applications.

Keywords:
programmed crackstrain sensorstretchabilitytunabilitywearable electronics

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Last Updated: Oct 26, 2025

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Mechanical Engineering

Background:

  • Stretchable strain sensors are vital for monitoring deformations, from subtle vibrations to large movements.
  • Achieving controlled sensitivity and high stretchability simultaneously remains a significant challenge in sensor development.

Purpose of the Study:

  • To develop a novel method for fabricating highly sensitive and stretchable strain sensors with tunable performance.
  • To demonstrate the efficacy of programmable cracking technology for controlling microcrack morphology in strain sensing layers.

Main Methods:

  • Utilized a single-metal material on an elastomer substrate with a one-pot evaporation fabrication method.
  • Employed elastomeric substrate surface chemistry modification to control microcrack generation and morphology.
  • Investigated the relationship between film morphology and strain sensing characteristics.

Main Results:

  • Achieved strain sensors with a high sensitivity gauge factor exceeding 10,000.
  • Demonstrated excellent stretchability up to 100% strain.
  • Reported devices with a frequency response up to 5.2 Hz and stability over 1000 cycles.

Conclusions:

  • Programmable cracking technology offers fine tunability of cracked film morphology for optimized strain sensor performance.
  • The developed sensors can accurately track both subtle and drastic mechanical deformations.
  • These advanced strain sensors show promise for applications in healthcare, human-machine interaction, and smart-home devices.