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Related Concept Videos

Unsymmetric Bending01:18

Unsymmetric Bending

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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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Mechanisms of Membrane-bending01:15

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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Rigid-flexible interlocked metastructures enable conformal stealth.

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Researchers developed a robust, flexible stealth skin inspired by chain mail. This electromagnetic skin offers ultrabroadband absorption and significant radar reduction for aerospace applications.

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Area of Science:

  • Materials Science
  • Electromagnetics
  • Aerospace Engineering

Background:

  • Ancient chain mail inspires a novel stealth skin architecture.
  • The design integrates mechanical robustness with electromagnetic functionality.
  • Existing materials often compromise strength for electromagnetic performance.

Purpose of the Study:

  • To introduce a lightweight, conformable, and load-bearing stealth skin.
  • To demonstrate ultrabroadband electromagnetic absorption and radar cross-section reduction.
  • To establish a design strategy for adaptable, multifunctional surfaces.

Main Methods:

  • Fabrication of a stealth skin using topologically interlocking units.
  • Characterization of electromagnetic absorption across a wide frequency range (2-40 GHz).
  • Testing of mechanical resilience, including damage and bending fatigue.

Main Results:

  • Achieved over 90% absorption across 96.3% of the 2-40 GHz band.
  • Demonstrated insensitivity to polarization and incident angle.
  • Maintained full functionality after 25% unit damage and 10,000 bending cycles.
  • Reduced drone radar cross-section by over 98% when applied to wings.

Conclusions:

  • The chain mail-inspired stealth skin offers superior mechanical and electromagnetic properties.
  • This adaptable, multifunctional surface is suitable for advanced aerospace and wearable technologies.
  • The design strategy enables robust electromagnetic functionality in challenging conditions.