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Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

935
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...
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Related Experiment Video

Updated: Mar 6, 2026

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
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Optical alignment of oval graphene flakes.

E Mobini, A Rahimzadegan, R Alaee

    Optics Letters
    |March 16, 2017
    PubMed
    Summary

    Graphene flakes can be manipulated using light. Oval graphene flakes can be rotated and oriented by far-infrared light, offering control over their spatial alignment.

    Area of Science:

    • Physics
    • Materials Science
    • Nanotechnology

    Background:

    • Atomically thin graphene supports localized surface plasmon polaritons at mid- to far-infrared frequencies.
    • These properties enable significant optical forces and torques, making graphene suitable for optical manipulation.

    Purpose of the Study:

    • Investigate optical forces and torques on circular and oval graphene flakes.
    • Explore the spatial alignment of graphene flakes under far-infrared illumination.

    Main Methods:

    • Utilized full-wave numerical simulations.
    • Employed an analytical model treating graphene flakes in a dipole approximation.

    Main Results:

    • Torque on circular graphene flakes was found to be zero.

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  • Oval graphene flakes exhibited finite torque, enabling rotation and orientation relative to the electric field polarization.
  • Alignment direction (parallel or perpendicular) depended on the wavelength.

    • Conclusions:

    • Demonstrated effective control over the spatial alignment of graphene flakes using far-infrared light.
    • Highlighted the potential of patterned graphene for optical manipulation applications.