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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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Hooke's Law01:26

Hooke's Law

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Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
2.0K
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

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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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Thermal Strain01:19

Thermal Strain

3.2K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
3.2K
Stress-Strain Diagram01:10

Stress-Strain Diagram

7.1K
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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Production of a Strain-Measuring Device with an Improved 3D Printer
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Material approaches to stretchable strain sensors.

Jaeyoon Park1, Insang You, Sangbaie Shin

  • 1Department of Material and Science, Yonsei University, 134 Shinchon-dong, Seoul (Korea).

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|February 3, 2015
PubMed
Summary

Recent advances in stretchable sensors are reviewed, focusing on materials for high flexibility and sensitivity in wearable electronics. This includes novel approaches for resistive and capacitive strain sensors for applications in electronic skins, robotics, and biomedicine.

Keywords:
conducting materialselectronic skinssensorsstretchable electronicswearable devices

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Area of Science:

  • Materials Science
  • Electronics Engineering
  • Biomedical Engineering

Background:

  • Wearable electronics demand high flexibility and stretchability (over 30% strain).
  • Conventional strain sensors are brittle and unsuitable for these applications.
  • Growing interest in stretchable sensors for electronic skins, robotics, and biomedical uses.

Purpose of the Study:

  • To review recent advances in stretchable strain sensors.
  • To focus on material aspects enabling high stretchability and sensitivity.
  • To discuss challenges and future perspectives in stretchable sensor development.

Main Methods:

  • Review of material manipulation techniques for stretchable resistive sensors (e.g., waved structures, liquid metals, conductive composites).
  • Exploration of approaches for stretchable capacitive sensors, emphasizing electrode conductivity.
  • Introduction to the Wheatstone bridge circuit for conventional resistive strain sensors.

Main Results:

  • Waved structural approaches, liquid metals, and conductive filler/elastomer composites enhance metal and semiconductor stretchability.
  • Constant electrode conductivity is crucial for reliable capacitive strain sensors.
  • Various material strategies offer pathways to high-performance stretchable sensors.

Conclusions:

  • Significant progress has been made in developing stretchable strain sensors.
  • Material innovation is key to achieving high stretchability and sensitivity.
  • Further research is needed to address major challenges and unlock future potential.