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Related Concept Videos

Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

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Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
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Beams01:30

Beams

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Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
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Plastic Deformations01:19

Plastic Deformations

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Plastic Deformations01:14

Plastic Deformations

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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

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When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Bessel beam generation using a segmented deformable mirror.

Xiaoming Yu, Ankesh Todi, Hongmei Tang

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    |June 8, 2018
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    Summary
    This summary is machine-generated.

    Researchers used a deformable mirror to create tunable Bessel beams for applications like laser processing and optical trapping. This method offers precise control over beam shape and size, enhancing laser technologies.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Bessel beams are crucial for applications requiring tunable spot sizes, including laser material processing, optical trapping, and advanced imaging.
    • Controlling the transverse and longitudinal shape of Bessel beams is essential for optimizing these applications.

    Purpose of the Study:

    • To experimentally and computationally demonstrate the generation of zero- and higher-order Bessel beams with tunable characteristics using a segmented deformable mirror.
    • To investigate the feasibility of using deformable mirrors for spatial beam shaping of high-power ultrafast lasers.

    Main Methods:

    • A segmented deformable mirror was employed to replicate the phase structure of a reflective axicon.
    • The tilt angle and piston position of mirror segments were optimized to control beam properties.
    • Zero-order Bessel beams were generated at various converging angles, and first-order Bessel beams were created using an azimuthal phase ramp.

    Main Results:

    • Generated zero-order Bessel beams exhibited controllable core diameter, peak intensity, and depth-of-focus, matching simulation predictions.
    • The characteristic annular shape of first-order Bessel beams was successfully produced.
    • The performance of the deformable mirror was validated through comparison with theoretical calculations.

    Conclusions:

    • Segmented deformable mirrors are effective for generating tunable zero- and higher-order Bessel beams.
    • Deformable mirrors offer advantages for high-power ultrafast laser applications due to low absorption, dispersion, and fast frame rates.
    • This technique provides a promising avenue for advanced spatial beam shaping in laser material processing and other fields.