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関連する概念動画

Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

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Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...
619
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

525
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
525
Power Dissipated in a Circuit: Problem Solving01:15

Power Dissipated in a Circuit: Problem Solving

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The equivalent resistance of a combination of resistors depends on their values and how they are connected.
The simplest combinations of resistors are series and parallel connections. In a series circuit, the first resistor's output current flows into the second resistor's input; therefore, each resistor's current is the same. Thus, the equivalent resistance is the algebraic sum of the resistances. The current through the circuit can be found from Ohm's law and is equal to the...
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Elasticity01:12

Elasticity

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Elasticity is the ability of an object to withstand the effects of distortion and to return to its original size and shape once the forces causing deformation are removed. When an elastic material deforms under the action of an external force, it experiences internal resistance to the deformation. However, if no external force is applied, it returns to its original state.
The elasticity of an object can be described by a stress-strain curve, which represents the relationship between stress...
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Elasticity in Concrete01:20

Elasticity in Concrete

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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...
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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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超低機械的な分散のための弾性ストレスの工学

A H Ghadimi1, S A Fedorov1, N J Engelsen1

  • 1Institute of Physics, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.

Science (New York, N.Y.)
|April 14, 2018
PubMed
まとめ

エンジニアは,ナノスケールストレスをソフトクランプ音声工学と組み合わせることで,ナノスケールデバイスで超低機械的な消耗を達成しました. この画期的な進歩により,高品質なノーマケニカルシステムが実現しました.

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Design of a Biaxial Mechanical Loading Bioreactor for Tissue Engineering
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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 機械工学

背景:

  • ナノスケールの構造は極度のストレスを発揮し,シリコントランジスタの高い電子移動性などの材料特性を高めることができます.
  • ナノメカニカルシステムの機械的な分散は,その性能と一貫性を制限する重要な要因です.

研究 の 目的:

  • 機械的な分散を減らすためにソフトクランプと組み合わせたナノスケールのストレスの使用を調査する.
  • 極めて高品質な超一貫したナモメカニカルデバイスを設計する.

主な方法:

  • 非均一なフォノニク・クリスタル・パターンを有するフリースタンドのナノビームの製造.
  • ナノビーム内のストレスの位置と屈折運動.
  • 振動モードと品質要因を特徴付けるため,室温でリングダウン測定を行います.

主要な成果:

  • ナノビームにおける弦のような振動モードの実証
  • 達成された品質 (Q) 要素は8億です.
  • 観測されたQ × 周波数プロダクトは10^15ヘルツを超え,超低分散を示しています.

結論:

  • 音声工学の形態であるソフトクランプは,ナノスケールのストレスと組み合わせると,機械的な分散を効果的に軽減します.
  • 設計されたナノビームは,超一貫したナノメカニカル装置に適した性質を示しています.
  • このアプローチは,高度なナノメカニカルシステムの開発に有望な経路を提供します.