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Related Concept Videos

Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

281
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
281
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

282
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...
282
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

270
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...
270
Stresses in a Shaft01:18

Stresses in a Shaft

553
The shaft PQ is subjected to a twisting force when equal and opposite torques are applied on either side. A section that cuts perpendicular to the shaft's axis at any arbitrary point R is examined to understand this. When the free-body diagram of the QR segment is analyzed, it reveals the shearing forces exerted by the PR portion onto the QR segment as the shaft experiences twisting.
Applying equilibrium conditions to the QR segment establishes that the internal shearing forces within the...
553
Residual Stresses in Bending01:18

Residual Stresses in Bending

295
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
295
Principal Stresses01:24

Principal Stresses

407
The graphical depiction of normal and shearing stress equations is represented by a circle, demonstrating the interplay between these stresses under different angular conditions. The center of this circle C, located on the vertical axis, represents the average normal stress, while its radius shows the range of stress variations. At points A and B, where the circle intersects the horizontal axis, the maximum and minimum normal stresses are observed, occurring without shearing stress. These...
407

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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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Putting the Squeeze on Phase Separation.

Carla Fernández-Rico1, Tianqi Sai1, Alba Sicher1

  • 1Department of Materials, ETH Zürich, 8093 Zurich, Switzerland.

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Summary
This summary is machine-generated.

Nature controls phase separation for cellular processes and advanced materials. A new method uses elastic polymer networks to precisely control synthetic material microstructures, mimicking biological systems.

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Area of Science:

  • Materials Science
  • Biophysics
  • Polymer Science

Background:

  • Phase separation is fundamental in biological and synthetic systems, enabling diverse functionalities.
  • Nature expertly controls phase separation for cellular regulation and creating materials with unique properties, like bird feathers.
  • Synthetically controlling phase separation at microscale remains challenging for material scientists.

Purpose of the Study:

  • To review established methods for controlling liquid-liquid phase separation.
  • To introduce a novel arrest method for phase separation using elastic polymer networks.
  • To discuss future opportunities in fabricating microstructured materials via mechanical control.

Main Methods:

  • Review of existing liquid-liquid phase separation control techniques.
  • Exploration of phase separation within elastic polymer networks as an arrest mechanism.
  • Analysis of mechanically controlled phase separation for microstructured material fabrication.

Main Results:

  • Established methods offer limited precision in controlling synthetic phase separation.
  • Phase separation within elastic polymer networks shows promise for precise microstructure control.
  • Mechanically controlled phase separation presents new avenues for advanced material design.

Conclusions:

  • Precise control over phase separation is key to advanced material properties.
  • Elastic polymer networks offer a promising route to arrest and control phase separation.
  • Further research into mechanically controlled phase separation can unlock novel microstructured materials.