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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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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...
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Deformations in a Symmetric Member in Bending01:18

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When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
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Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array
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Deformability-Based Electrokinetic Particle Separation.

Teng Zhou1,2, Li-Hsien Yeh3, Feng-Chen Li4

  • 1Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China. zhouteng@hainu.edu.cn.

Micromachines
|November 9, 2018
PubMed
Summary
This summary is machine-generated.

This study demonstrates a microfluidic device for separating deformable particles based on their shear modulus. The device utilizes fluid-particle-electric field interactions to sort particles by deformability.

Keywords:
arbitrary Lagrangian–Eulerian (ALE)dielectrophoresismicrofluidicparticle separation

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Area of Science:

  • Biophysics
  • Microfluidics
  • Computational Science

Background:

  • Particle deformability is a key property for separating cells and colloidal particles.
  • Existing separation methods may not effectively distinguish particles based on subtle deformability differences.

Purpose of the Study:

  • To numerically investigate a microfluidic device for sorting deformable particles.
  • To analyze the influence of particle deformability, electric field strength, and device geometry on separation performance.

Main Methods:

  • Direct numerical simulation of fluid-particle-electric field interactions.
  • Arbitrary Lagrangian-Eulerian finite-element method for modeling.

Main Results:

  • Particles with varying shear moduli exhibited distinct shapes and trajectories within the microchannel contraction.
  • The study identified shear modulus, electric field strength, and microfluidic design as critical parameters for separation.

Conclusions:

  • The proposed microfluidic device effectively separates particles based on deformability.
  • Numerical simulations confirm the potential of this approach for advanced particle sorting applications.