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Measurements of Strain

Measurements of Strain

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...

Strain and Elastic Modulus

Strain and Elastic Modulus

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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Liquid Polymer/Metallic Salt-Based Stretchable Strain Sensor to Evaluate Fruit Growth.

Hyun Jae Lee¹, Robin Joyce¹, Junghoon Lee¹

¹Department of Mechanical Engineering, College of Engineering, Seoul National University, Seoul 08826, Republic of Korea.

ACS Applied Materials & Interfaces

|January 19, 2022

Summary

Researchers developed a novel liquid-state stretchable strain sensor using poly(ethylene glycol) and silver nitrate. This innovative sensor offers precise fruit growth monitoring with high sensitivity and stability.

Keywords:

dendrometer fruit growth liquid polymer long-term measurement poly(ethylene glycol)silver nitrate strain sensor

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Area of Science:

Materials Science
Biotechnology
Sensor Technology

Background:

Conventional fruit dimension measurement methods are bulky and difficult for continuous monitoring.
Existing systems face challenges with precision and ease of use in agricultural applications.

Purpose of the Study:

To develop an innovative, liquid-state stretchable strain sensor for precise fruit growth monitoring.
To overcome the limitations of conventional measurement techniques in terms of bulkiness and continuous monitoring.

Main Methods:

Incorporated poly(ethylene glycol) (PEG) and silver nitrate into a transparent polymer band.
Optimized the ratio of poly(dimethylsiloxane) (PDMS) and Ecoflex (20:80) for desired mechanical properties.
Investigated the correlation between strain and resistance of the PEG-silver nitrate composite sensor.

Main Results:

Achieved high sensitivity and good repeatability with linear resistance changes (R² > 0.99) up to 30% strain.
Demonstrated excellent sensor stability (1.7 to 3.9 kΩ/mm) when tested as a dendrometer on fruits.
The sensor exhibited a balance of large strain, low stress, and reduced stickiness.

Conclusions:

The developed liquid-state stretchable strain sensor offers a promising solution for precise, long-term fruit growth evaluation.
This tunable elastic band sensor opens new avenues for versatile applications in agricultural monitoring.
The sensor's performance validates its potential for non-invasive, continuous measurement of biological growth.