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Related Concept Videos

Shearing Stress01:18

Shearing Stress

Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
Shearing Strain01:20

Shearing Strain

The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
Normal and Shear Force01:14

Normal and Shear Force

When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
Relation Between the Distributed Load and Shear01:23

Relation Between the Distributed Load and Shear

Understanding the relationship between the distributed load and shear force in structural analysis is crucial for analyzing beams subjected to various loading conditions. Consider the case of a beam experiencing a distributed load, two concentrated loads, and a couple moment.
Rolling With Slipping01:14

Rolling With Slipping

Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can affect...

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Related Experiment Video

Updated: Jul 4, 2026

Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes
08:42

Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes

Published on: April 10, 2017

Slip at high shear rates.

Ashlie Martini1, Hua-Yi Hsu, Neelesh A Patankar

  • 1School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, USA.

Physical Review Letters
|June 4, 2008
PubMed
Summary
This summary is machine-generated.

Fluid slip behavior at high shear rates is clarified. Slip length reaches a constant value as shear rate increases, revealing molecular mechanics and the need for accurate heat transfer calculations in simulations.

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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes
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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Area of Science:

  • Fluid dynamics
  • Computational physics
  • Materials science

Background:

  • Contradictory data exist regarding fluid slip behavior at high shear rates.
  • Understanding slip is crucial for various microfluidic and nanoscale applications.

Purpose of the Study:

  • To resolve discrepancies in published data on fluid slip at high shear rates.
  • To elucidate the molecular mechanisms governing fluid slip.
  • To provide guidelines for accurate computational modeling of fluid slip.

Main Methods:

  • Employed three distinct methodologies: molecular dynamics simulations, analytical slip theory, and Navier-Stokes-based calculations.
  • Investigated a diverse range of fluids, including bead-spring liquids, polymer solutions, and ideal gas flows.
  • Analyzed fluid behavior across a spectrum of shear rates.

Main Results:

  • Demonstrated that slip length asymptotically approaches a constant value as shear rate increases.
  • Provided insights into the fundamental molecular mechanics responsible for fluid slip.
  • Highlighted the critical importance of incorporating heat transfer to the solid in molecular dynamics simulations at high shear rates.

Conclusions:

  • The study resolves conflicting data by showing slip length plateaus at high shear rates.
  • Molecular dynamics simulations require accurate heat transfer modeling for high shear rate predictions.
  • Findings advance the understanding of fluid-surface interactions in non-equilibrium conditions.