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Measurements of Strain01:27

Measurements of Strain

1.9K
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...
1.9K
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

477
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...
477

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Related Experiment Video

Updated: Aug 16, 2025

Production of a Strain-Measuring Device with an Improved 3D Printer
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An angle-compensating colorimetric strain sensor with wide working range and its fabrication method.

Nguyen Hoang Minh1,2, Kwanoh Kim1, Do Hyun Kang1

  • 1Department of Nano Manufacturing Technology, Korea Institute of Machinery and Materials (KIMM), Daejeon, South Korea.

Scientific Reports
|December 19, 2022
PubMed
Summary

This study introduces a novel mechanical strain sensor utilizing nanoscale photonic crystals on a stretchable substrate. The sensor changes color with stretching, offering a simple, sensitive, and cost-effective solution for various applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Visual color changes are intuitive sensor principles, driving research in chemical, thermal, and mechanical sensors.
  • Developing sensors with simple mechanisms, high sensitivity, reliability, and cost-effective fabrication remains challenging.

Purpose of the Study:

  • To propose a novel mechanical strain sensor with nanoscale 2D photonic crystal structures.
  • To achieve a wide working range and high sensitivity through integrated nanostructures.
  • To develop a cost-effective and scalable fabrication process.

Main Methods:

  • Fabrication of nanoscale 2D photonic crystal structures on a stretchable polydimethylsiloxane (PDMS) substrate.
  • Integration of multiple nanostructures with varying periodicities to enhance sensor performance.
  • Utilization of reusable nanoparticle-assembled molds for scalable sensor replication.

Main Results:

  • The sensor exhibits structural colors due to its periodic nanostructures.
  • Stretching the sensor alters nanostructure periodicity, causing a visible color shift.
  • The sensor demonstrates a working range up to 150% with high sensitivity.

Conclusions:

  • The proposed photonic crystal strain sensor offers a promising approach for visual strain detection.
  • The fabrication method, using reusable molds, is suitable for industrial manufacturing.
  • This technology has potential applications in healthcare, infrastructure monitoring, soft robotics, and wearable devices.