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関連する概念動画

Transformation of Plane Strain01:12

Transformation of Plane Strain

When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
Shearing Strain01:20

Shearing Strain

The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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

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.

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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
14:52

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Published on: September 23, 2018

グラフェンの脱位による変形.

Jamie H Warner1, Elena Roxana Margine, Masaki Mukai

  • 1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK. jamie.warner@materials.ox.ac.uk

Science (New York, N.Y.)
|July 17, 2012
PubMed
まとめ
この要約は機械生成です。

離位は,結合の回転や原子の喪失を通してグラフェンに移動し,格子を変形させます. この研究は,2D材料におけるプラスチック変形の原子レベルの動態を明らかにしています.

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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

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14:52

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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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科学分野:

  • マテリアルサイエンス 材料科学
  • 凝縮物質物理学 凝縮物質物理学
  • ナノテクノロジー ナノテクノロジー

背景:

  • 脱位運動は,結晶材料のプラスチック変形に不可欠です.
  • 変位ダイナミクスに関する研究は,主に三次元材料に焦点を当てています.
  • グラフェンにおける原子レベルの変位ダイナミクスに関する実験データは限られている.

研究 の 目的:

  • 原子レベルでのグラフェンの脱位ペアの動態を調査する.
  • 変位運動のメカニズムとそのグラフェンの格子構造への影響を理解する.
  • グラフェンの変位によって引き起こされる原子規模の変形を実験的に観察し,特徴づけること.

主な方法:

  • 異位動態を記録するために単原子感度技術を活用した.
  • ジグザグ状の格子方向に沿った段階的な変位運動を分析した.
  • 網格変形を理解するために,決定された張力場.

主要な成果:

  • 単一結合の回転または2つの炭素原子の喪失によって媒介された,観察された変位運動.
  • 変位によるグラフェンの原子レベルの変形を特徴づけた.
  • C-C結合の伸縮/圧縮,剪定,格子回転を含む,特定されたストレンスフィールド.

結論:

  • グラフェンの変位ダイナミクスは,異なる原子機構によって媒介され得る.
  • 変位は,グラフェンの格子における重要な原子レベルの変形を引き起こします.
  • この研究は,二次元材料におけるプラスチックの変形に関する重要な実験的洞察を提供します.