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The mechanics of deformation in curved members, such as beams or arches, under bending moments, involve complex responses. When such a member, symmetric about the y-axis and shaped like a segment of a circle centered at point C, is subjected to equal and opposite forces, its curvature and surface lengths change significantly. This alteration results in the shift of the curvature's center from C to C', indicating a tighter curve.
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Pure bending is a fundamental concept in structural mechanics, essential for understanding how materials deform under symmetrical loads without direct forces. Pure bending occurs when prismatic members, such as beams, are subjected to equal and opposite moments that induce bending. The phenomenon is crucial as it allows for predicting stress distributions without the influence of axial or shear forces.
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Twisted Dual-Cycle Fiber Optic Bending Loss Characteristics for Strain Measurement.

Sang-Jin Choi1, Seong-Yong Jeong2, Changhyun Lee3

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Sensors (Basel, Switzerland)
|November 21, 2018
PubMed
Summary

A novel intensity-based fiber optic sensor (FOS) head utilizing twisted dual-cycle bending loss was developed. This sensor effectively measures tensile load, tensile strain, and flexural strain, with adjustable performance based on configuration.

Keywords:
bending lossfiber optic sensorfiber reinforced plastics coupon strainintensity-based fiber optic sensorstrain sensor

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Area of Science:

  • Optical Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Fiber optic sensors (FOS) offer robust sensing capabilities.
  • Bending loss in optical fibers is a known phenomenon that can be exploited for sensing.
  • Developing adaptable FOS for structural health monitoring is crucial.

Purpose of the Study:

  • To propose and experimentally demonstrate an intensity-based FOS head using twisted dual-cycle bending loss.
  • To investigate the influence of steel wire radius, number, and distance on sensor performance.
  • To enable adjustable measurement ranges and sensitivities for load and strain detection.

Main Methods:

  • Fabrication of FOS heads with varying configurations.
  • Bonding FOS heads to fiber-reinforced plastics (FRP) coupons.
  • Conducting tensile and flexural strain tests, measuring bending loss, and converting to strain values.

Main Results:

  • The FOS head demonstrated effective measurement of tensile load (up to 4.5 kN) and flexural strain (up to 1,760 με).
  • Sensitivities ranged from 0.70 to 3.99 dB/kN for tensile load and 0.930 to 6.554 dB/mm for flexural strain.
  • Sensing ranges varied from 82 to 138 mm, with average errors of 57.7 N for load and 42.6 με for strain.

Conclusions:

  • The proposed FOS head can accurately measure load, tensile strain, and flexural strain.
  • Sensor performance metrics, including sensitivity and operating range, are tunable by adjusting the FOS head configuration.
  • This technology holds potential for adaptable structural health monitoring applications.