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関連する概念動画

Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

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Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
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Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

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The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...
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Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

264
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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Composite Masonry Walls01:18

Composite Masonry Walls

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Composite masonry walls combine multiple wythes of the same or different masonry materials to create a unified structure. These walls feature wythes that are bonded together either through mortar-filled collar joints, grouted spaces, or more commonly, with rigid metal ties and reinforcements, with the use of masonry header units being rare. Metal ties are preferred because they effectively minimize water penetration, as these walls primarily absorb moisture and then release it into the...
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関連する実験動画

Updated: Dec 18, 2025

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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特殊な強度を持つ階層構造のダイヤモンド複合材料

Yonghai Yue1,2, Yufei Gao1, Wentao Hu1

  • 1Center for High Pressure Science, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, China.

Nature
|June 20, 2020
PubMed
まとめ
この要約は機械生成です。

研究者たちは 階層的な構造を持つ新しいダイヤモンド複合材料を開発し 硬さを損なうことなく 合成ダイヤモンドの5倍もの硬さを達成しました この突破は 優れた超硬質材料と 工学的な陶器に繋がるでしょう

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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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関連する実験動画

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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
09:13

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

Published on: April 1, 2017

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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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科学分野:

  • 材料科学
  • ナノテクノロジー
  • クリスタルグラフィー

背景:

  • 硬度と硬さのトレードオフは,材料科学,特にダイヤモンドにとって重要な課題です.
  • ナノ構造は ダイヤモンドの硬さや頑丈さを高めます
  • 限られた研究で ダイアモンドの強化戦略は バイオインスピレーションによる複合材料のようなものです

研究 の 目的:

  • 階層的な構造を持つ新しいダイヤモンドの複合体を特徴づける.
  • 複合材料の機械的特性,特に硬さと強さを評価する.
  • 先進的なダイヤモンド複合材料の 破裂メカニズムを理解するために

主な方法:

  • 階層的に組み立てられたダイヤモンド複合物の構造的特徴.
  • 一貫したインターフェイス構造,ナノツイン,ナノグラインを持つダイヤモンドポリタイプの合成.
  • シングルエッジのノッチビーム試験を用いた機械的試験で,断裂の強さを決定する.

主要な成果:

  • 複合ダイヤモンドは硬さを失わずに硬さ (合成ダイヤモンドの最大5倍) を高めています.
  • 亀裂の伝播は3Cナノツインを通してジグザグの経路をたどり,3C以外のポリタイプインターフェイスで渦巻く骨折に拡散します.
  • 断裂表面やジグザグの亀裂経路の近くの3Cダイヤモンドへの局所的変換は,張力エネルギーを散らばし,頑丈さを増加させます.

結論:

  • ダイアモンド複合材料の階層構造は 硬さと強さのトレードオフを克服できます
  • このアプローチは,高度な超硬質材料と工学用セラミクスの開発への道を開きます.
  • 開発された複合材料は,いくつかのマグネシウム合金よりも優れた強度を示しています.