Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Fatigue01:21

Fatigue

230
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...
230
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

212
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.
The Maximum Shearing Stress Criterion, also known as...
212
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

945
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...
945
Design Consideration01:22

Design Consideration

312
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
312
Microcracking in Concrete01:20

Microcracking in Concrete

201
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...
201
Stress-Strain Diagram - Brittle Materials01:24

Stress-Strain Diagram - Brittle Materials

2.8K
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...
2.8K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Effect of ice nucleating proteins on the structure-property relationships of ice: A molecular dynamics study.

The Journal of chemical physics·2026
Same author

A material dynamically enhancing both load-bearing and energy dissipation capability under cyclic loading.

Science advances·2025
Same author

Self-limiting material growth triggered and tunable by force through piezocharge-induced mineralization.

Materials horizons·2024
Same author

From Molecular to Multiasperity Contacts: How Roughness Bridges the Friction Scale Gap.

ACS nano·2023
Same author

Hierarchically structured bioinspired nanocomposites.

Nature materials·2022
Same author

Novel mineralized electrospun chitosan/PVA/TiO<sub>2</sub> nanofibrous composites for potential biomedical applications: computational and experimental insights.

Nanoscale advances·2022

Video Experimental Relacionado

Updated: Aug 30, 2025

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture
09:53

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture

Published on: May 13, 2018

8.4K

Pronóstico de la falla del metal desde su inicio

Mostafa M Omar1, Jaafar A El-Awady1

  • 1Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, USA.

Science (New York, N.Y.)
|September 1, 2022
PubMed
Resumen

Los primeros eventos de deformación microscópica pueden predecir la vida útil de los metales. Este hallazgo ofrece nuevos conocimientos sobre la ciencia de los materiales y la predicción de la durabilidad del metal.

Área de la Ciencia:

  • Ciencias de los materiales
  • Trabajos de metalurgia
  • Mecánica de los sólidos

Sus antecedentes:

  • La comprensión de la degradación del metal es crucial para la integridad estructural y la seguridad.
  • Predecir la vida útil de los componentes metálicos es un desafío de ingeniería importante.
  • Los métodos actuales para evaluar la vida útil de los metales a menudo se basan en observaciones macroscópicas o pruebas aceleradas.

Objetivo del estudio:

  • Investigar la correlación entre la deformación microscópica temprana y la vida útil total de los metales.
  • Establecer un modelo predictivo para la fatiga del metal basado en cambios microstruturales iniciales.
  • Explorar nuevos métodos para la evaluación no destructiva de la degradación de los materiales.

Principales métodos:

Más Videos Relacionados

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes
11:05

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes

Published on: December 13, 2016

12.3K
Potentiodynamic Corrosion Testing
08:43

Potentiodynamic Corrosion Testing

Published on: September 4, 2016

17.7K

Videos de Experimentos Relacionados

Last Updated: Aug 30, 2025

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture
09:53

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture

Published on: May 13, 2018

8.4K
Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes
11:05

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes

Published on: December 13, 2016

12.3K
Potentiodynamic Corrosion Testing
08:43

Potentiodynamic Corrosion Testing

Published on: September 4, 2016

17.7K
  • Utilizando técnicas avanzadas de microscopía (por ejemplo, microscopía electrónica) para observar cambios microstruturales.
  • El uso de pruebas mecánicas in situ para capturar eventos de deformación a microescala.
  • Analizar los patrones de deformación y correlacionarlos con los criterios de fallo de los materiales establecidos.

    • Principales resultados:

    • Los eventos de deformación microscópica, como el movimiento de dislocación y la nucleación de vacío, se identificaron como indicadores clave.
    • Se estableció una fuerte correlación entre la frecuencia y la gravedad de estos eventos tempranos y la vida útil restante del material.
    • El estudio demostró que los conocimientos microscópicos pueden mejorar significativamente las predicciones de la vida útil en comparación con los métodos tradicionales.

    Conclusiones:

    • La deformación microscópica temprana es un precursor confiable de la falla macroscópica en los metales.
    • La evaluación de estos eventos iniciales proporciona una herramienta poderosa para predecir la vida útil del metal.
    • Este enfoque tiene el potencial de revolucionar las estrategias de monitoreo y mantenimiento de la salud de los materiales.