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Videos de Conceptos Relacionados

Plastic Deformations01:19

Plastic Deformations

Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their original...
Plastic Deformations01:14

Plastic Deformations

It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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...
Plasticity00:58

Plasticity

Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
Plastic Behavior01:21

Plastic Behavior

A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and reloaded.
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...

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Video Experimental Relacionado

Updated: Jul 11, 2026

Determining the Mechanical Strength of Ultra-Fine-Grained Metals
05:04

Determining the Mechanical Strength of Ultra-Fine-Grained Metals

Published on: November 22, 2021

Ciencias de los materiales: Deformaciones en la materia extrema.

R Lakes

    Science (New York, N.Y.)
    |September 11, 2007
    PubMed
    Resumen

    Algunos materiales se expanden cuando se estiran, exhibiendo una relación de Poisson negativa. Esta propiedad inusual, observada en espumas y plasmas iónicos, puede conducir a la incompressibilidad, manteniendo el volumen constante durante la deformación.

    Área de la Ciencia:

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

    Sus antecedentes:

    • La mayoría de los materiales se contraen en sección transversal cuando se estiran.
    • Algunos materiales, como las espumas, exhiben un comportamiento auxético, expandiéndose lateralmente cuando se estiran.
    • Este fenómeno se caracteriza por una relación de Poisson negativa.

    Objetivo del estudio:

    • Para discutir los orígenes de la relación de Poisson negativa en los materiales.
    • Explorar las implicaciones de esta propiedad tanto en materiales isotrópicos como en materiales anisotrópicos.
    • Para resaltar la investigación que demuestra la incompressibilidad en materiales con una relación de Poisson negativa.

    Principales métodos:

    • Revisión de la literatura y discusión teórica.

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    High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus
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    Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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    Synthesis and Microdiffraction at Extreme Pressures and Temperatures

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    Last Updated: Jul 11, 2026

    Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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    Determining the Mechanical Strength of Ultra-Fine-Grained Metals

    Published on: November 22, 2021

    High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus
    12:30

    High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus

    Published on: April 3, 2018

    Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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    Synthesis and Microdiffraction at Extreme Pressures and Temperatures

    Published on: October 7, 2013

  • Análisis del comportamiento auxético en diferentes tipos de materiales.
  • Examen de datos experimentales para plasmas iónicos.

    • Principales resultados:

    • Los materiales con una relación de Poisson negativa pueden exhibir incompressibilidad.
    • Este comportamiento se predice para materiales de densidades extremas, desde las costras de estrellas de neutrones hasta los plasmas iónicos.
    • La validación experimental utilizando plasmas iónicos confirma las predicciones teóricas.

    Conclusiones:

    • La relación de Poisson negativa es una propiedad clave que permite la incompressibilidad del material.
    • Los materiales auxiliares tienen aplicaciones potenciales en diversos campos debido a sus características únicas de deformación.
    • Una mayor investigación sobre los materiales auxéticos podría desbloquear nuevas posibilidades de ingeniería.