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Related Concept Videos

Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
524
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

427
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Unsymmetric Bending01:18

Unsymmetric Bending

519
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

622
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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Bending of Material: Problem Solving01:09

Bending of Material: Problem Solving

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In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
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Related Experiment Video

Updated: Oct 12, 2025

Writing Bragg Gratings in Multicore Fibers
08:48

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Vector bending sensor based on an edge-core cladding-type fiber Bragg grating.

Fengyi Chen, Xingyong Li, Weijia Bao

    Optics Express
    |November 23, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a compact fiber Bragg grating sensor for measuring 2D bending. The sensor accurately detects both the magnitude and direction of fiber bends using spectral analysis.

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    A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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    Area of Science:

    • Optoelectronics
    • Fiber Optics
    • Sensor Technology

    Background:

    • Fiber Bragg gratings (FBGs) are widely used for sensing applications.
    • Existing FBG sensors often lack the ability to measure bending in two dimensions simultaneously.
    • Compact and simple sensor designs are crucial for practical implementation.

    Purpose of the Study:

    • To propose and demonstrate a novel two-dimensional vector bending sensor.
    • To utilize an edge-core cladding-type fiber Bragg grating (ECLFBG) for enhanced bending detection.
    • To achieve simultaneous measurement of bending magnitude and direction.

    Main Methods:

    • Inscribing an ECLFBG in an edge-core using a femtosecond laser point-by-point technique.
    • Analyzing the reflection spectrum of the ECLFBG under various bending conditions.
    • Correlating wavelength shift and reflection intensity variations with bending parameters.

    Main Results:

    • The reflection spectrum of the ECLFBG demonstrated significant variations with fiber bending.
    • The sensor showed sensitivity to both the magnitude and direction of the applied bend.
    • Simultaneous measurement of bending magnitude and direction was achieved by analyzing spectral trends and intensity changes.

    Conclusions:

    • The developed ECLFBG sensor offers a compact and simple solution for 2D vector bending measurement.
    • This technology has potential applications in structural health monitoring and robotics.
    • The sensor's ability to simultaneously determine bending magnitude and direction enhances its utility.