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関連する概念動画

Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

654
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
654
Plastic Behavior01:21

Plastic Behavior

259
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...
259
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

326
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.
326
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

215
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
215

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関連する実験動画

Updated: Sep 9, 2025

Engineering Fibrin-based Tissue Constructs from Myofibroblasts and Application of Constraints and Strain to Induce Cell and Collagen Reorganization
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形状メモリ コラーゲン・スキャフォールド 大規模な周期的負荷を維持

Yan Luo1, Hardik Makkar2,3, Yuntao Hu4,5

  • 1Mechanical Engineering and Applied Mechanics, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.

ACS materials letters
|September 5, 2025
PubMed
まとめ
この要約は機械生成です。

この研究では,プレコンプレッションとリオフィライゼーションを用いて機械的に堅固なコラーゲン・スキャファードを開発しました. これらの密集した形状記憶ヒドロゲルは,周期的な負荷下での例外的な回復力を発揮し,ダイナミックな環境での細胞の生存能力をサポートします.

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Engineering Fibrin-based Tissue Constructs from Myofibroblasts and Application of Constraints and Strain to Induce Cell and Collagen Reorganization
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科学分野:

  • バイオマテリアル科学
  • 組織工学
  • 材料科学

背景:

  • 自然生体ポリマーヒドロゲルは,力学的な強さと動的負荷下での安定性に制限があります.
  • ダイナミックな機械環境でのアプリケーションには,堅固な水素ゲル・スキャファードの開発が不可欠です.

研究 の 目的:

  • ダイナミックなアプリケーションのための強化された機械的性質を持つクロスリンクされたコラーゲン冷凍ジェル・スキャフォールドを設計する.
  • 周期的な負荷下での凝縮されたコラーゲン・スキャファードの構造的および機械的回復力を調査する.

主な方法:

  • プレコンプレッションとリオフィライゼーションによるクロスリンクされたコラーゲン・クライジェル・スキャフォールドの製造
  • サイクル圧縮負荷とオグデン超弾性モデリングを使用して機械的性質の評価.
  • 第二ハーモニックジェネレーション (SHG) 画像を用いた微細構造分析.
  • 細胞の封じ込め,活力,および周期的負荷への反応の評価

主要な成果:

  • 密集したエスカファードは200サイクルで90%以上の軸圧延に耐え,驚くべき回復力を示しました.
  • オグデンモデリングとSHG画像は,繊維の配列とストレスの硬化が機械的強度に貢献することを明らかにしました.
  • リヒドレーテッドの水素は,相変圧が減少したネットワークの安定性と復元性を示した.
  • 細胞活性を維持し,周期的な負荷下での細胞濃縮を促進した.

結論:

  • 密集した形状記憶コラーゲン構造は 機械的に頑丈で 生物互換性のある ダイナミックな環境の解決策です
  • 開発されたエスカファードは,繰り返し大規模な機械的ストレス下での持続的な性能を必要とするアプリケーションに希望を示しています.
  • このアプローチは,自然生物ポリマーの有用性を要求するバイオメカニカルアプリケーションに高めます.