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Related Concept Videos

Tensile Strength Considerations of Concrete01:16

Tensile Strength Considerations of Concrete

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Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
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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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Concrete is a fundamental building material, and understanding its strengths is crucial for construction projects. The relationship between its tensile and compressive strengths is intricate, showing that while these strengths are related, they do not increase at the same rate. Tensile strength's growth is slower and is affected by various factors such as the methods used for testing, the size and shape of the specimen, the texture of the aggregate used, and the moisture content of the...
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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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Highly tensile-strained Ge/InAlAs nanocomposites.

Daehwan Jung1, Joseph Faucher1, Samik Mukherjee2

  • 1Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.

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|January 28, 2017
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Summary

Researchers created novel germanium/Indium-Aluminum-Arsenide nanocomposites. These materials exhibit significant tensile strain, offering potential for advanced electronic and optoelectronic devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Self-assembled nanocomposites combine multiple material phases for novel properties.
  • Epitaxial growth of lattice-mismatched materials allows for strain engineering to enhance material characteristics.

Purpose of the Study:

  • To report the self-assembled growth of highly tensile-strained Germanium/Indium-Aluminum-Arsenide (Ge/InAlAs) nanocomposites.
  • To demonstrate the tunability of strain in these nanocomposites for advanced material applications.

Main Methods:

  • Utilized spontaneous phase separation for self-assembled growth.
  • Employed Transmission Electron Microscopy (TEM) for structural analysis.
  • Applied Raman Spectroscopy to quantify biaxial tensile strain.
  • Investigated Photoluminescence (PL) and Electroluminescence (EL) for device potential.

Main Results:

  • Achieved coherent embedding of single-crystalline Germanium nanostructures within an InAlAs matrix without extended defects.
  • Quantified a 3.8% biaxial tensile strain in Germanium nanostructures.
  • Demonstrated strain tunability up to 5.3% by modifying the matrix lattice constant.

Conclusions:

  • Epitaxial nanocomposites offer a versatile platform for precise strain engineering.
  • The developed Ge/InAlAs nanocomposite system shows significant promise for future electronic and optoelectronic device realization.