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Related Concept Videos

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 of...
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Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

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Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
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Cavity walls feature a hollow space between the outer and inner wythes, connected only by corrosion-resistant metal ties. When water seeps through the outer wythe, it descends within this cavity, intercepted by flashing and eventually exiting through weep holes. To enhance moisture resistance, the inner wythe's cavity side often receives damp-proofing, doubling as an air barrier. The cavity can also house insulation to mitigate heat transfer.
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Bending of Members Made of Several Materials01:11

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

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The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
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Hollow Fiber Bioreactors for In Vivo-like Mammalian Tissue Culture
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New route for hollow materials.

C M Rivaldo-Gómez1, F F Ferreira1, G T Landi1

  • 1Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André - SP, 09210-580, Brazil.

Scientific Reports
|August 25, 2016
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Summary
This summary is machine-generated.

Researchers developed a new method for creating hollow micro/nano structures using thermal oxidation and electric current during phase transitions. This process enables colossal mass transfer for fabricating advanced functional materials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Hollow micro/nano structures are crucial functional materials with diverse applications.
  • Existing fabrication methods often face limitations in scalability and control.

Purpose of the Study:

  • To introduce a novel method for fabricating hollow micro/nano structures.
  • To investigate the underlying mechanism of colossal mass transfer during material fabrication.

Main Methods:

  • Utilizing thermal oxidation in conjunction with electric current passage.
  • Inducing a structural phase transition at high temperatures to facilitate ion mobility.
  • Observing the inward delocalization of vacancies driven by electric current.

Main Results:

  • Demonstrated a colossal mass transfer of titanium (Ti) ions.
  • Successfully fabricated hollow titanium dioxide (TiO2) microtubes.
  • Identified the synergistic effect of phase transition and electric current in void formation.

Conclusions:

  • The combined thermal oxidation and electric current method offers a new route for hollow material fabrication.
  • The phenomenon is driven by a combination of phase transition, electrical current, and chemical reactions.
  • This approach is potentially applicable to other metals exhibiting structural phase transitions at high temperatures.