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相关概念视频

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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相关实验视频

Updated: May 20, 2026

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

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Published on: September 23, 2018

在石墨烯中因脱位而导致的变形.

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
概括
此摘要是机器生成的。

失位通过键旋转或原子损失在石墨烯中移动,使晶格变形. 这项研究揭示了二维材料中塑料变形的原子级动态.

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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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Published on: September 23, 2018

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

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 纳米技术纳米技术

背景情况:

  • 脱位运动对于晶体材料的塑性变形至关重要.
  • 关于脱位动态的研究主要集中在三维材料上.
  • 关于石墨烯原子级失位动态的实验数据有限.

研究的目的:

  • 在原子水平上研究石墨烯中脱位对的动态.
  • 了解脱位运动的机制及其对石墨烯晶格结构的影响.
  • 通过实验观察和描述由石墨烯失位引起的原子尺度变形.

主要方法:

  • 使用单原子灵敏度技术来记录失位动态.
  • 分析了沿着齐克扎克格子方向的逐步位移运动.
  • 确定应变场以了解格子变形.

主要成果:

  • 通过单键旋转或两个碳原子的损失介导的观察到的脱位运动.
  • 描述了石墨烯在原子层面的变形的特征.
  • 确定了涉及C-C键延长/压缩,剪切和格子旋转的应变场.

结论:

  • 石墨烯的脱位动态可以通过不同的原子机制进行调解.
  • 失位会导致石墨烯网格中显著的原子级变形.
  • 这项研究为二维材料的塑料变形提供了关键的实验见解.