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Videos de Conceptos Relacionados

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
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Deformaciones inducidas por la dislocación en el grafeno.

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
Resumen
Este resumen es generado por máquina.

Las dislocaciones se mueven en el grafeno a través de la rotación de enlaces o la pérdida de átomos, deformando la red. Este estudio revela la dinámica a nivel atómico de la deformación plástica en materiales 2D.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Física de la materia condensada Física de la materia condensada
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • El movimiento de dislocación es fundamental para la deformación plástica en materiales cristalinos.
  • La investigación sobre la dinámica de la dislocación se ha centrado principalmente en los materiales tridimensionales.
  • Los datos experimentales sobre la dinámica de la dislocación a nivel atómico en el grafeno son limitados.

Objetivo del estudio:

  • Para investigar la dinámica de los pares de dislocación en el grafeno a nivel atómico.
  • Comprender los mecanismos del movimiento de dislocación y su impacto en la estructura de celosía del grafeno.
  • Observar y caracterizar experimentalmente la deformación a escala atómica causada por las dislocaciones en el grafeno.

Principales métodos:

  • Utilizó técnicas de sensibilidad de un solo átomo para registrar la dinámica de la dislocación.
  • Analizó el movimiento de dislocación escalonado a lo largo de la dirección de la red zig-zag.
  • Campos de deformación determinados para comprender la deformación de la celosía.

Principales resultados:

  • Movimiento de dislocación observado mediado por la rotación de un solo enlace o la pérdida de dos átomos de carbono.
  • Caracterizó la deformación a nivel atómico del grafeno por dislocaciones.
  • Campos de deformación identificados que involucran alargamiento / compresión de enlaces C-C, cizallamiento y rotaciones de celosía.

Conclusiones:

  • La dinámica de dislocación en el grafeno puede estar mediada por distintos mecanismos atómicos.
  • Las dislocaciones inducen una deformación significativa a nivel atómico en la red del grafeno.
  • Esta investigación proporciona conocimientos experimentales cruciales sobre la deformación plástica en materiales bidimensionales.