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Related Concept Videos

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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The Influence of Cyclic Torsion with Application of Current Pulses on the Formability of CuZn30 Brass.

Zbigniew Zimniak1, Wojciech Weiler1, Karol Jaśkiewicz1

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Electric pulses applied during cyclic torsion tests reduce stress and increase strain in α-brass CuZn30. This novel electroplastic forming method enhances material formability, potentially revolutionizing bulk forming processes.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Manufacturing Processes

Background:

  • Understanding material formability is crucial for optimizing manufacturing.
  • Cyclic torsion is a complex deformation process.
  • Electrically assisted forming (EAF) offers potential for enhanced material processing.

Purpose of the Study:

  • To investigate the effect of electric pulses on the symmetric cyclic torsion of α-brass CuZn30.
  • To evaluate the influence of electric pulse parameters on material formability.
  • To explore the combination of cyclic torsion and EAF for novel bulk forming techniques.

Main Methods:

  • Symmetric cyclic torsion tests were performed on α-brass CuZn30.
  • Electric pulses with varying durations and periods were applied during torsion.
  • Microstructural analysis using electron backscatter diffraction (EBSD) was conducted.

Main Results:

  • Application of electric pulses consistently reduced stress during cyclic torsion.
  • Electric pulses generally increased the strain compared to tests without current.
  • The study demonstrated the first combination of cyclic torsion and EAF in electroplasticity.

Conclusions:

  • Electric pulse application enhances the formability of α-brass CuZn30 under cyclic torsion.
  • This electroplastic torsion method shows promise for developing new manufacturing processes.
  • The findings pave the way for advanced bulk forming techniques.