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Related Concept Videos

Thermal Strain01:19

Thermal Strain

2.8K
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...
2.8K
Shearing Strain01:20

Shearing Strain

1.4K
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Measurements of Strain01:27

Measurements of Strain

2.6K
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...
2.6K
Strain Energy01:13

Strain Energy

940
Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
Consider a rod that is fixed at one end and subjected to an axial force at the free end. This axial force induces stress within the rod, leading to its elongation. As the axial force increases, so does the elongation of the rod, illustrating a direct relationship between the force applied and the resulting...
940
Stress-Strain Diagram01:10

Stress-Strain Diagram

2.3K
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...
2.3K
Transformation of Plane Strain01:12

Transformation of Plane Strain

505
When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
505

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Updated: Jan 25, 2026

Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing
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A High Sensitivity FBG Strain Sensor Based on Flexible Hinge.

Mingyao Liu1,2, Wenzhi Wang3,4, Han Song5,6

  • 1School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China. lmylyf@126.com.

Sensors (Basel, Switzerland)
|April 27, 2019
PubMed
Summary
This summary is machine-generated.

A novel fiber Bragg grating (FBG) strain sensor utilizes a flexible hinge bridge to magnify displacement, achieving 10x higher sensitivity for mechanical structure monitoring. This enhanced sensor accurately detects micro-strain, improving system health diagnostics.

Keywords:
FBG-based strain sensorflexibility matrix methodflexible hingesensitization

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Fiber Bragg Grating (FBG) sensors are crucial for structural health monitoring.
  • Improving the sensitivity of FBG sensors is essential for detecting micro-strains.
  • Existing FBG sensors may lack the required sensitivity for certain applications.

Purpose of the Study:

  • To design a novel FBG-based strain sensor with enhanced sensitivity.
  • To develop a displacement magnification structure for FBG sensors.
  • To enable accurate micro-strain measurement on mechanical structures.

Main Methods:

  • Designed a novel FBG sensor incorporating a flexible hinge bridge displacement magnification structure.
  • Calculated the strain sensitization amplification factor using the flexible matrix method and strain energy theory.
  • Verified sensor magnification through simulation analysis and experimental testing.

Main Results:

  • The novel sensor achieved a strain sensitivity of 10.84 pm/με.
  • The sensor's sensitivity is approximately 10 times higher than that of a bare FBG sensor.
  • The error between theoretical calculations and simulation analysis was less than 7%.

Conclusions:

  • The developed flexible hinge bridge structure significantly enhances FBG sensor sensitivity.
  • The novel sensor is capable of accurately measuring micro-strains.
  • This high-sensitivity FBG sensor is well-suited for mechanical system health monitoring.