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Videos de Conceptos Relacionados

Torsion of Noncircular Members01:16

Torsion of Noncircular Members

213
Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
213
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

233
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
233
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

191
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...
191
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

441
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
441
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

238
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
238
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

229
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
229

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Electroplastic Cyclic Deformation of CuZn30 Brass.

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Video Experimental Relacionado

Updated: Sep 10, 2025

A Novel Biaxial Testing Apparatus for the Determination of Forming Limit under Hot Stamping Conditions
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La influencia de la torsión cíclica con la aplicación de pulsos de corriente en la formabilidad del bronce CuZn30

Zbigniew Zimniak1, Wojciech Weiler1, Karol Jaśkiewicz1

  • 1Department of Metal Forming, Welding and Metrology, Wrocław University of Science and Technology, 7-9 Ignacego Łukasiewicza Street, 50-371 Wrocław, Poland.

Materials (Basel, Switzerland)
|August 28, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los pulsos eléctricos aplicados durante los ensayos de torsión cíclica reducen la tensión y aumentan la deformación en α-latón CuZn30. Este nuevo método de formación de electroplásticos mejora la formabilidad del material, revolucionando potencialmente los procesos de formación a granel.

Palabras clave:
CuZn30 de latónpulsos de corrientetorsión cíclicaFormación asistida eléctricamentePruebas plastométricas

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Área de la Ciencia:

  • Ciencias de los materiales
  • Ingeniería mecánica
  • Procesos de fabricación

Sus antecedentes:

  • Comprender la formabilidad del material es crucial para optimizar la fabricación.
  • La torsión cíclica es un proceso de deformación complejo.
  • El formado eléctrico asistido (EAF, por sus siglas en inglés) ofrece un potencial para mejorar el procesamiento de materiales.

Objetivo del estudio:

  • Para investigar el efecto de los pulsos eléctricos en la torsión cíclica simétrica de α-latón CuZn30.
  • Evaluar la influencia de los parámetros del pulso eléctrico en la formabilidad del material.
  • Explorar la combinación de torsión cíclica y EAF para nuevas técnicas de formación de granel.

Principales métodos:

  • Se realizaron ensayos simétricos de torsión cíclica en CuZn30 de latón α.
  • Se aplicaron pulsos eléctricos con diferentes duraciones y períodos durante la torsión.
  • Se realizó un análisis microestructural mediante difracción por retrodispersión de electrones (EBSD).

Principales resultados:

  • La aplicación de pulsos eléctricos reduce constantemente la tensión durante la torsión cíclica.
  • Los pulsos eléctricos generalmente aumentaban la tensión en comparación con los ensayos sin corriente.
  • El estudio demostró la primera combinación de torsión cíclica y EAF en electroplasticidad.

Conclusiones:

  • La aplicación de pulsos eléctricos mejora la formabilidad de la α-latón CuZn30 bajo torsión cíclica.
  • Este método de torsión electroplástica es prometedor para el desarrollo de nuevos procesos de fabricación.
  • Los hallazgos allanan el camino para técnicas avanzadas de formación a granel.