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関連する概念動画

Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

116
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
116
Spanning Openings in Brick Walls01:20

Spanning Openings in Brick Walls

245
In brick wall construction, supporting structures are crucial for openings like windows and doors to maintain the integrity and support the weight of the wall above. These supports include lintels, corbels, and arches, each serving specific structural purposes.
Lintels are primary supports used to span openings and can be crafted from materials such as reinforced concrete, steel-reinforced brick masonry, or simple steel angles. These are straightforward to install and are typically concealed...
245
Elasticity in Concrete01:20

Elasticity in Concrete

128
Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
128
Bending of Material: Problem Solving01:09

Bending of Material: Problem Solving

239
In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
239
Mortar Properties01:17

Mortar Properties

176
Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to...
176
Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

518
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
518

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プログラム可能な性質を持つ不規則な建築材料の成長規則

Ke Liu1,2, Rachel Sun1, Chiara Daraio1

  • 1Department of Mechanical and Civil Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
|August 25, 2022
PubMed
まとめ
この要約は機械生成です。

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科学分野:

  • 材料科学
  • バイオ材料工学
  • 計算モデリング

背景:

  • バイオマテリアルには 複雑で不規則な微細構造があり 機能効率に寄与します
  • 微細構造の不規則性と材料の特性との関係は完全に理解されず,エンジニアリングされた材料の設計を制限しています.

研究 の 目的:

  • 幾何学的に不規則なバイオマテリアルの基本的,確率的な構造-特性関係を調査する.
  • 不完全感受性や衝撃吸収性などの機能強化されたエンジニアリング材料のための計算アプローチを開発する.

主な方法:

  • ローカルルールに基づく ストキャスティックマイクロアーキテクチャを生成するために 成長にインスピレーションを受けた 仮想プログラムを活用しました
  • 不規則な材料のトポロジーと幾何学をモデル化および分析するためにグラフベースの表現を使用しました.
  • 機械性能の制御メカニズムを特定するために,材料の性質をシミュレートします.

主要な成果:

  • 仮想成長プログラムは,限られた初期リソースから,幅広い機能特性を有する多様なマイクロ構造を成功裏に生成しました.
  • 微細構造のトポロジーと幾何学を操作することによって,機械的性質を制御するための基本的な規則を特定した.
  • 衝撃吸収とストレスのリダイレクトを含む優れた機能を持つ材料を作成する可能性を実証しました.

結論:

  • 不規則な微細構造は 自然と人工システムの 効率的な材料機能の鍵です
  • 確率的,ルールベースの成長アプローチは, 適合した機械的性質を持つバイオマテリアルを効果的に設計することができます.
  • この研究は,マイクロ構造制御に基づく予測可能な性能を持つ高度な材料の設計のための枠組みを提供します.