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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

1.0K
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...
1.0K
Transformation of Plane Strain01:12

Transformation of Plane Strain

169
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...
169
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

537
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
537

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Updated: Jul 11, 2025

Production of a Strain-Measuring Device with an Improved 3D Printer
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Spacecraft Segment Damage Identification Method Based on Fiber Optic Strain Difference Field Reconstruction and Norm

Jihong Xu1, Jie Zeng1, Binbin Chen1

  • 1College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

Sensors (Basel, Switzerland)
|November 14, 2023
PubMed
Summary

This study introduces a novel algorithm for real-time spacecraft damage detection using strain response. The method accurately locates structural damage using only working loads, crucial for health monitoring.

Keywords:
damage recognitionfiber optic grating sensorspacecraft segment structurestrain response difference fieldvector norms

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Area of Science:

  • Aerospace Engineering
  • Structural Health Monitoring
  • Materials Science

Background:

  • Real-time identification of spacecraft damage is vital for structural health monitoring and predicting operational life.
  • Existing methods struggle to detect minor structural damages solely through strain response analysis.

Purpose of the Study:

  • To develop an algorithm for real-time, online identification and precise localization of spacecraft structural damage.
  • To overcome limitations in detecting small damages using only strain response data.

Main Methods:

  • Proposed a damage response characteristic field inversion algorithm based on differential reconstruction of strain response.
  • Developed four crack damage location identification methods utilizing vector norm computation.
  • Implemented a spacecraft segment structural damage monitoring system with fiber optic grating sensors.

Main Results:

  • Achieved online identification and precise localization of structural damage events using only spacecraft working loads, without external excitation.
  • The curvature vector 2-norm calculation method yielded an average damage localization error of 2.58 mm and a root-mean-square error of 1.98 mm.

Conclusions:

  • The developed algorithm and methods demonstrate superior engineering applicability for on-orbit spacecraft service environments.
  • The approach enables effective structural health monitoring and life prediction through accurate damage detection.