複合材料は,ダイヤモンドよりも高い粘着弾性硬さを持つ
T Jaglinski1, D Kochmann, D Stone
1Institute of Shock Physics, Washington State University, Pullman, WA 99163, USA.
Science (New York, N.Y.)
|February 3, 2007
まとめ
新しい複合材料は,非常に高い粘弾性モジュールを達成し,ダイヤモンドを上回ります. このブレークスルーは,金属マトリックス内のバリウムチタナートインクルージョンの安定した負質量モジュールから生じている.
科学分野:
- マテリアルサイエンス 材料科学
- 固体力学 固体力学とは
- 複合材料 複合材料は複合材料で作られています.
背景:
- 従来の複合材料は,構成要素の特性によって制限される性質を持っています.
- 最も硬い構成要素よりも大きなモジュールを達成することは通常不可能です.
- バリウムチタナートインクルージョンは,制限されない場合,体積変化相変換を示します.
研究 の 目的:
- 粘弾性モジュールが構成要素を大幅に上回る複合材料を実証する.
- ダイヤモンドよりも大きなモジュールを達成するメカニズムを調査する.
- 制限されたバリウムチタナートインクルージョンの役割を調査する.
主な方法:
- 金属マトリックスにバリウムチタナートを含む複合材料の製造.
- 粘弾性モジュールと強さを測定するための機械試験.
- 制約下でのバリウムチタナートの相変化行動の分析.
主要な成果:
- 複合材料は,金属マトリックスまたはバリウムチタナートよりも著しく高い粘弾性モジュールを示した.
- 複合材料のモジュールはダイヤモンドのモジュールを上回ったが,強さはそうではなかった.
- バリウムチタナートインクルージョンを制限することで,負の質量モジュールを安定させました.
結論:
- 複合材料は,構成要素の性質をはるかに超えるモジュールを持つように設計することができます.
- インクルージョンの安定した負質量モジュールは,高モジュールの複合材料を作成するための有効なメカニズムです.
- このアプローチは,優れた機械的特性を持つ高度な材料を設計するための新しい経路を提供します.
さらに関連する動画
09:54Measuring the Mechanical Properties of Glass Fiber Reinforcement Polymer Composite Laminates Obtained by Different Fabrication Processes
Published on: June 30, 2023
07:42Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
関連する概念動画
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
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.
01:11Bending of Members Made of Several Materials
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
01:12Bonding and Strength of Aggregate
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
01:30Relation Between Tensile Strength and Compressive Strength of Concrete
Concrete is a fundamental building material, and understanding its strengths is crucial for construction projects. The relationship between its tensile and compressive strengths is intricate, showing that while these strengths are related, they do not increase at the same rate. Tensile strength's growth is slower and is affected by various factors such as the methods used for testing, the size and shape of the specimen, the texture of the aggregate used, and the moisture content of the concrete.
01:25Reinforcements in Concrete
Reinforced concrete is a composite material used extensively in construction, combining the compressive strength of concrete with the tensile strength of steel. This synergy is essential as concrete, while excellent at resisting compression, is weak under tension. Steel bars, or rebars, are embedded in the concrete to handle these tensile forces. The choice of steel is strategic; it shares a similar coefficient of thermal expansion with concrete, which ensures uniformity in response to...
01:22Fiber Reinforced Concrete
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...