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関連する概念動画

Microcracking in Concrete01:20

Microcracking in Concrete

Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
Plastic...
Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
Mass Concreting01:22

Mass Concreting

Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
Creep in Concrete01:22

Creep in Concrete

Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
Design Example: Joints in Concrete Pavements01:28

Design Example: Joints in Concrete Pavements

Concrete pavement joints are essential for maintaining the structural integrity and longevity of pavement by controlling where and how the pavement cracks. These joints can be categorized based on their functions, such as contraction or control joints, construction joints, isolation joints, and expansion joints.
Contraction joints are typically formed by sawing a groove into the concrete shortly after it has hardened. This creates a weakened vertical plane, deliberately encouraging cracking at...

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関連する実験動画

Updated: May 22, 2026

Control of Cell Geometry through Infrared Laser Assisted Micropatterning
11:04

Control of Cell Geometry through Infrared Laser Assisted Micropatterning

Published on: July 10, 2021

制御されたクラッキングによるパターニング.

Koo Hyun Nam1, Il H Park, Seung Hwan Ko

  • 1Research Center of MEMS Space Telescope, Department of Physics, Ewha Womans University, Daehyun-dong 11-1, Seodaemun-gu, Seoul 120-750, South Korea. koonam@namk.org

Nature
|May 12, 2012
PubMed
まとめ
この要約は機械生成です。

研究者は,シリコン基板のシリコンニトリド薄膜の亀裂パターンを制御しました. この技術は,高度な材料アプリケーションのための複雑で秩序付けられたクラック形態の精密なナノ製造を可能にします.

さらに関連する動画

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
07:37

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method

Published on: January 16, 2019

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
05:30

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Published on: September 29, 2019

関連する実験動画

Last Updated: May 22, 2026

Control of Cell Geometry through Infrared Laser Assisted Micropatterning
11:04

Control of Cell Geometry through Infrared Laser Assisted Micropatterning

Published on: July 10, 2021

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
07:37

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method

Published on: January 16, 2019

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
05:30

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Published on: September 29, 2019

科学分野:

  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー
  • 骨折力学 骨折力学とは

背景:

  • 亀裂の形成は通常,材料の故障につながる.
  • しかし,クラッキングは,スパイラル,振動,フラクタル幾何学のような複雑なパターンを生み出すことができます.

研究 の 目的:

  • チャネリングされたクラックパターンの制御された開始,拡散,終了を実証する.
  • フィルム/基板システムにおける独特のクラック形態の形成を調査する.

主な方法:

  • シリコン基板にシリコンニトリド薄膜を使用した.
  • クラックの開始のためのストレスを集中するために,基板にマイクロノッチを使用しました.
  • 特定のクラックパターンを達成するために,制御された加工条件.

主要な成果:

  • 3つの再現可能なクラック形態を成功裏に作成しました:直線,振動,そして秩序ある二叉 (縫い目).
  • システムのパラメータを変更することによって,クラックの方向の変化に対する制御が実証されています.
  • プレフォームドの複数段階のクラックストップを使用して,クラックの拡散の終結を達成しました.

結論:

  • 開発されたパターニング技術は,ナノ製造における新たな機会を提供します.
  • 現在の最先端の方法を超えて,原子規模のパターン形成のための基礎を提供します.