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Bonding in Metals02:32

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Band Theory02:35

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Stress-Strain Diagram - Ductile Materials01:24

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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
Shearing Strain01:20

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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...
Yield Criteria for Ductile Materials under Plane Stress01:25

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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
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A Novel Biaxial Testing Apparatus for the Determination of Forming Limit under Hot Stamping Conditions
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Published on: April 4, 2017

Las bandas de corte dilatantes en metales solidificados.

C M Gourlay1, A K Dahle

  • 1The CAST CRC, Materials Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia. c.gourlay@minmet.uq.edu.au

Nature
|January 5, 2007
PubMed
Resumen

Las aleaciones parcialmente solidificadas se comportan como materiales granulares, exhibiendo dilatación y localización de deformación. Este comportamiento granular es crucial para comprender los defectos en la fundición a presión de aleaciones de aluminio y magnesio.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Física Física es la física de las cosas.
  • La ingeniería de ingeniería de ingeniería.

Sus antecedentes:

  • Los materiales granulares compactados exhiben comportamientos únicos bajo corte, distintos de sus fases constituyentes.
  • Los principios de la física granular han avanzado la comprensión en campos como la mecánica del suelo y las avalanchas.
  • La solidificación de aleaciones metálicas implica una microestructura de cristal líquido abarrotado en ciertas fracciones sólidas.

Objetivo del estudio:

  • Para investigar si las aleaciones metálicas parcialmente solidificadas se deforman como materiales granulares.
  • Para explorar la relevancia del comportamiento de los materiales granulares para el procesamiento de solidificación.
  • Comprender los mecanismos de formación de defectos en la fundición de aleaciones.

Principales métodos:

  • Observación experimental de aleaciones parcialmente solidificadas.
  • Análisis de la deformación microestructural bajo corte.
  • Comparación con los principios establecidos de la mecánica granular como la dilatación y la localización de la deformación.

Principales resultados:

  • Las aleaciones parcialmente solidificadas exhiben características de materiales granulares sin cohesión.
  • Se observó la dilatación de Reynolds y la localización de la tensión en bandas de cizallamiento.
  • Este comportamiento granular afecta directamente la formación de defectos en la fundición a presión de aleaciones de Al y Mg.

Conclusiones:

  • Los principios de la mecánica granular se pueden aplicar al procesamiento de solidificación.
  • Comprender el comportamiento granular en aleaciones ofrece información sobre la reducción de defectos.
  • Las sinergias entre la mecánica granular y la ciencia de la solidificación tienen un potencial significativo para la innovación.