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Related Concept Videos

Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

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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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Prismatic Beams: Problem Solving01:15

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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
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Shear on the Horizontal Face of a Beam Element01:16

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To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
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Beams with Symmetric Loadings01:15

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The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
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Deflection of a Beam01:19

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Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
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Related Experiment Video

Updated: Jan 9, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Exploring five types of beam shaping using tiled-aperture coherent beam combining.

Yunhui Xie1, James A Grant-Jacob2, Matthew Praeger2

  • 1Optoelectronics Research Centre, University of Southampton, Southampton, UK. Yunhui.Xie@soton.ac.uk.

Communications Engineering
|December 2, 2025
PubMed
Summary

Coherent Beam Combination (CBC) enhances High-Power Fiber Lasers (HPFLs) by enabling versatile beam shaping and steering. This technique allows precise control over laser beam focus and movement in 3D space.

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Area of Science:

  • Optics and Photonics
  • Laser Physics

Background:

  • High-Power Fiber Lasers (HPFLs) face power-scaling limitations.
  • Coherent Beam Combination (CBC) offers a solution by combining multiple laser outputs.

Purpose of the Study:

  • To demonstrate advanced beam shaping and steering capabilities of CBC.
  • To explore phase control for versatile optical element approximation and beam manipulation.

Main Methods:

  • Experimental validation using spatial light modulation to simulate controllable fibre outputs.
  • Phase manipulation to approximate optical element phase profiles (lenses, spiral plates).

Main Results:

  • CBC successfully approximated phase profiles of spherical lenses, axicon lenses, and spiral phase plates.
  • Phase-only control enabled steering and rotation of the combined beam focus in 3D.
  • Demonstrated Bessel-like and orbital angular momentum beam profiles.

Conclusions:

  • CBC extends beyond power scaling, offering advanced beam shaping and steering.
  • Phase-controlled CBC provides pathways for multifunctional optical power delivery systems.