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Videos de Conceptos Relacionados

Tensile Strength Considerations of Concrete01:16

Tensile Strength Considerations of Concrete

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Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen...
151
Microcracking in Concrete01:20

Microcracking in Concrete

150
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Stress-Strain Diagram - Brittle Materials01:24

Stress-Strain Diagram - Brittle Materials

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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
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Fatigue01:21

Fatigue

208
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
208
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

191
Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
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Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

212
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
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Video Experimental Relacionado

Updated: Jul 21, 2025

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Las grietas de tracción pueden romper los límites de velocidad clásicos

Meng Wang1, Songlin Shi1, Jay Fineberg1

  • 1Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Science (New York, N.Y.)
|July 27, 2023
PubMed
Resumen

Los investigadores descubrieron grietas de super cizalladura en materiales frágiles que viajan más rápido que las velocidades de la onda de cizallamiento, desafiando la mecánica clásica de la fractura. Este hallazgo revela un nuevo modo de fallo del material en las tensiones críticas.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Mecánica de los sólidos
  • La física

Sus antecedentes:

  • La fractura de materiales frágiles a través de la propagación rápida de las grietas.
  • La mecánica clásica de la fractura postula que las grietas de tracción se mueven más lentamente que la velocidad de las ondas de Rayleigh.
  • La disipación de energía elástica ocurre en las puntas de las grietas en los modelos clásicos.

Objetivo del estudio:

  • Para demostrar experimentalmente la existencia de grietas de tensión de super cizalladura.
  • Para investigar la dinámica de las grietas que exceden las velocidades de las ondas de corte.
  • Explorar los principios fundamentales que rigen este modo de fractura no clásico.

Principales métodos:

  • Utilizando materiales frágiles neo-Hookean para los experimentos.
  • Observación y medición de las velocidades de propagación de las grietas.
  • Análisis de la dinámica de las grietas bajo tensiones críticas aplicadas.

Principales resultados:

  • Las pruebas experimentales confirman grietas de tensión de supercorte.
  • Se han observado grietas que superan las velocidades de las ondas de corte (Fórmula: ver texto).
  • Las grietas de supereparación se aceleran suavemente, potencialmente acercándose a las velocidades de las ondas de dilatación.

Conclusiones:

  • La fractura por superación representa un cambio fundamental en la dinámica de las grietas clásicas.
  • Este modo de fractura no clásico se inicia en las tensiones aplicadas críticas.
  • Los hallazgos desafían los modelos existentes de falla de materiales frágiles.