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Shearing Stress

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.

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

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Diblock-copolymer thin films under shear.

Lenin S Shagolsem¹, Torsten Kreer², Andre Galuschko²

¹Department of Physics, National Institute of Technology, Manipur, Imphal 795004, India.

The Journal of Chemical Physics

|November 3, 2016

Summary

This summary is machine-generated.

Shear flow affects vertically oriented lamellae in diblock-copolymer melts. Transverse shear causes unique chain motion and higher viscosity below a critical rate, unlike perpendicular shear.

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Area of Science:

Polymer Physics
Soft Matter Science
Materials Science

Background:

Diblock-copolymer melts form lamellar structures.
Confined systems and shear flow influence phase behavior.
Understanding polymer melt response to shear is crucial for material processing.

Purpose of the Study:

Investigate the behavior of vertically oriented lamellae (L⊥) in diblock-copolymer melts under shear.
Analyze the response to transverse and perpendicular shear modes.
Determine the effects of shear rate on lamellar structure and flow properties.

Main Methods:

Molecular dynamics simulations were employed.
Studied lamellae forming diblock-copolymer melts confined between non-selective substrates.
Analyzed a wide range of shear rates (γ̇).

Main Results:

Vertically oriented lamellae (L⊥) formed due to lack of substrate/copolymer preferential interaction.
Transverse shear below a critical rate (γ̇*) stabilized an inclined lamellae state via cyclic chain motion.
At γ̇*, lamellae dissolved and reoriented along the flow, coinciding with shear-thinning onset.
Shear viscosity was higher for transverse shear than perpendicular shear for γ̇ < γ̇*, but equal for γ̇ > γ̇*.

Conclusions:

Cyclic chain motion near substrates plays a key role in stabilizing lamellar structures under specific shear conditions.
The critical shear rate (γ̇*) marks a transition in flow behavior and lamellar orientation.
The macroscopic response to shear depends significantly on the shear mode (transverse vs. perpendicular) and shear rate.