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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...
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Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery
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Modeling the interactions between deformable capsules rolling on a compliant surface.

Alexander Alexeev1, Rolf Verberg1, Anna C Balazs1

  • 1Chemical Engineering Department, University of Pittsburgh, Pittsburgh, PA 15261. balazs1@engr.pitt.edu.

Soft Matter
|July 19, 2020
PubMed
Summary
This summary is machine-generated.

Fluid-driven capsule motion depends on substrate elasticity and adhesion. Capsule interactions are mediated by the underlying layer, enabling surface design for controlled cell and microcapsule movement in biological assays.

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Area of Science:

  • Multiphysics modeling
  • Biophysics
  • Materials Science

Background:

  • Cells and microcapsules behave as fluid-filled elastic shells.
  • Their motion on surfaces is crucial for biological processes and material applications.
  • Understanding capsule-substrate interactions is key for controlling cellular and microparticle behavior.

Purpose of the Study:

  • To investigate the fluid-driven motion of capsule pairs on compliant, adhesive substrates.
  • To determine how substrate properties and capsule elasticity influence their relative and average velocities.
  • To explore the potential for designing surfaces to control capsule separation.

Main Methods:

  • Integration of mesoscale models for hydrodynamics and micromechanics.
  • Simulation of fluid-filled elastic shells representing capsules.
  • Analysis of capsule dynamics on both stiff and soft substrates with varying adhesion.

Main Results:

  • Capsule separation or approach is dictated by substrate elasticity, capsule deformability, and adhesion strength.
  • On stiff surfaces, rigid capsules always separate; deformable capsules approach with weak adhesion and separate with strong adhesion.
  • Soft substrates generally promote capsule separation, except for deformable capsules with weak adhesion, which approach.

Conclusions:

  • Capsule interactions are mediated by the substrate's nature (compliance and adhesion).
  • Surface design can be used to actively control capsule separation dynamics.
  • Findings have implications for regulating biological cell and microcapsule motion in tissue engineering and biological assays.