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Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
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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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Related Experiment Video

Updated: Sep 29, 2025

Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration
14:24

Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration

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High-Performance Anisotropic Nanocomposites with a Novel Core/shell Microstructure.

Wei Quan1, Lulu Yao2,3, Qiang Zheng1

  • 1Institute of Materials, Shanghai University, Shanghai 200444, P. R. China.

ACS Applied Materials & Interfaces
|March 22, 2022
PubMed
Summary

Researchers developed new SmCo5@FeCo nanocomposites for stronger permanent magnets. This surfactant-assisted method achieved a 31% enhancement in energy product, paving the way for advanced magnetic materials.

Keywords:
SmCo5@FeCochemical coatingdual phase nanocompositepermanent magnetsurfactants

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Magnetism

Background:

  • Developing rare-earth-lean permanent magnets is crucial for next-generation technologies.
  • Fabricating high-performance magnetic nanocomposites faces challenges in controlling soft phase grain size.

Purpose of the Study:

  • To synthesize anisotropic SmCo5@FeCo nanocomposites using a novel surfactant-assisted low-temperature chemical coating (LTCC) method.
  • To enhance the magnetic properties of SmCo5-based materials for ultrastrong permanent magnets.

Main Methods:

  • Utilized surfactant-assisted low-temperature chemical coating (LTCC) to create SmCo5@FeCo nanocomposites.
  • Achieved uniform coating of 5-15 nm FeCo soft phase particles on SmCo5 hard phase.

Main Results:

  • Fabricated optimal anisotropic SmCo5@FeCo nanocomposites with 15 wt% soft phase coating.
  • Attained high coercivity (Hc) of 17.2 kOe and energy product ((BH)max) of 29.4 MGOe.
  • Demonstrated a 31% enhancement in energy product compared to uncoated SmCo5.

Conclusions:

  • The enhanced performance is attributed to nanosized grains and a high remanence ratio (Mr/Ms) of 0.976.
  • The LTCC method offers a promising route for synthesizing stronger bulk nanocomposite magnetic systems.
  • These findings represent a significant advancement toward cost-effective, high-performance permanent magnets.