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関連する概念動画

Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

2.2K
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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Plastic Behavior01:21

Plastic Behavior

620
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
620
Fatigue01:21

Fatigue

882
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
882
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

4.1K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Stress-Strain Diagram - Brittle Materials01:24

Stress-Strain Diagram - Brittle Materials

4.3K
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
4.3K
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

632
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
632

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Updated: Feb 20, 2026

Artificial Thermal Ageing of Polyester Reinforced and Polyvinyl Chloride Coated Technical Fabric
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サイクルストレスの下での無形材料の老化.

Dor Shohat1,2, Paul Baconnier3, Itamar Procaccia4,5

  • 1Department of Condensed Matter Physics, School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel.

Proceedings of the National Academy of Sciences of the United States of America
|February 18, 2026
PubMed
まとめ

アモルフな材料は,物理的老化,ゆっくりとしたリラックスプロセスを表します. サイクル運転は,分散の普遍的な対数分解を明らかにし,構造モデルは,この複雑な行動を最もよく説明します.

キーワード:
老化,老化は,老化しています.アモルフな材料とはサイクリックなドライビングヒステロンはヒステロンのことです.

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Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Studying Large Amplitude Oscillatory Shear Response of Soft Materials

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科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学
  • 統計力学 統計力学とは

背景:

  • アモルフな材料は,均衡状態から追い出されたとき,複雑で歴史に依存する行動を示します.
  • 物理的老化は,広大な時間スケールでゆっくりと非指数的なリラックスによって特徴付けられ,これらの材料の重要な現象です.
  • 老化を理解することは,材料の特性や振る舞いを予測するのに不可欠です.

研究 の 目的:

  • ゆっくりとした周期的な運転下での無形材料の老化行動を調査する.
  • 一般的な老化現象とその根本的なメカニズムを特定する.
  • 老化ダイナミクスを記述する際の異なるメソスコピクモデルの有効性を評価する.

主な方法:

  • 3つの異なる無形材料を周期的な運転を遅らせること.
  • 周期毎の時間の経過による分散を測定する.
  • 実験結果と3つのメソスコピックモデルからの予測を比較する:相互作用しないリラクゼーションプロセス,騒々しいヒステロンモデル,ビスタブルな弾性結合を持つ構造モデル.

主要な成果:

  • 一般的な老化現象が観察され,周期毎の分散の対数分解によって特徴付けられました.
  • この崩壊パターンは,周期的な駆動下で異なる無形物質に一貫していました.
  • ビスタブルな弾性結合のランダムなネットワークを特徴とする構造モデルだけが,実験結果を正確に再現した.

結論:

  • サイクルドライビングは,無形物質とそのエネルギー景観を特徴付けるための強力なプロトコルです.
  • 構造モデルの成功は,ゆっくりとしたエネルギーの景観探索と複製の対称性破壊の表現と結びついています.
  • この研究は,無形物質の様々なメソスコピクモデルを区別するための新しい方法を提供します.