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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.5K
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...
2.5K
Stress-Strain Diagram01:10

Stress-Strain Diagram

2.2K
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...
2.2K
Thermal Strain01:19

Thermal Strain

2.7K
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...
2.7K
Strain-Energy Density01:20

Strain-Energy Density

773
Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this region...
773
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

8.6K
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...
8.6K
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

874
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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Production of a Strain-Measuring Device with an Improved 3D Printer
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Enhanced Stretchable and Sensitive Strain Sensor via Controlled Strain Distribution.

Huamin Chen1, Longfeng Lv2, Jiushuang Zhang2

  • 1Fujian Provincial Key Laboratory of Functional Marine Sensing Materials, Center for Advanced Marine Materials and Smart Sensors, Minjiang University, Fuzhou 350108, China.

Nanomaterials (Basel, Switzerland)
|February 5, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a highly sensitive and stretchable graphene strain sensor by combining planar and crumpled forms. This novel approach enhances performance for wearable electronics and health monitoring applications.

Keywords:
graphenesensitivestrain distributionstrain sensorstretchable

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Wearable Electronics

Background:

  • Wearable opto-electronics are crucial for health monitoring and epidermal applications.
  • Resistive strain sensors require improvements in both sensitivity and stretchability for practical use.
  • Achieving high sensitivity and stretchability simultaneously in strain sensors remains a challenge.

Purpose of the Study:

  • To develop a simple strategy for constructing a highly sensitive and stretchable graphene-based strain sensor.
  • To effectively modulate the sensitivity and stretchability of the device by rationally connecting different graphene structures.
  • To demonstrate the sensor's performance in both stretching and bending modes.

Main Methods:

  • A simple strategy was employed to construct the strain sensor.
  • Highly sensitive planar graphene and highly stretchable crumpled graphene (CG) were rationally connected.
  • Strain distribution was analyzed using simulation results to guide the design.
  • The device's performance was evaluated under stretching and bending modes.

Main Results:

  • The strain sensor demonstrated a gauge factor (GF) of 20.1 at 105% tensile strain.
  • The device maintained high sensitivity over a large working range, enduring a maximum tensile strain of 135% with a GF of 337.8.
  • The sensor exhibited functionality in both outward and inward bending modes.
  • The method proved effective in simultaneously optimizing sensitivity and stretchability.

Conclusions:

  • A novel and simple method was introduced for creating highly sensitive and stretchable graphene-based strain sensors.
  • The developed sensor effectively balances sensitivity and stretchability for practical applications.
  • The proposed strategy holds potential for application to other material categories to enhance sensor performance.