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Updated: Jan 26, 2026
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A Triple Culture Cell System Modeling the Human Blood-Brain Barrier
Published on: November 30, 2021
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Disconnection description of triple-junction motion.
Spencer L Thomas1, Chaozhen Wei2,3, Jian Han1
1Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104-6272.
Summary
Grain boundary migration and triple junction motion are coupled via disconnection dynamics. A new continuum model based on this coupling accurately reproduces molecular dynamics simulations of microstructure evolution.
Area of Science:
- Materials Science
- Physics
- Computational Materials Science
Background:
- Grain boundary (GB) migration is fundamental to polycrystalline material evolution.
- Triple junctions (TJs) are critical nodes where three GBs meet and must move concurrently with GBs.
- GB migration is understood to occur via the motion of disconnections (line defects).
Purpose of the Study:
- To demonstrate the coupling between triple junction motion and grain boundary migration.
- To develop a physically based continuum model for microstructure evolution.
- To validate the continuum model against molecular dynamics simulations.
Main Methods:
- Molecular dynamics (MD) simulations of grain growth.
- Analysis of idealized microstructures.
- Development of a disconnection dynamics-based continuum model.
- Numerical implementation of the continuum model.
Main Results:
- Evidence showing that TJ motion and GB migration are coupled through disconnection dynamics.
- Successful development of a theory for coupled GB/TJ migration.
- Implementation of a continuum model that captures essential disconnection dynamics.
- Demonstration that the continuum model reproduces MD simulation results.
Conclusions:
- TJ motion and GB migration are intrinsically coupled processes.
- A physically based continuum model can effectively capture microstructure evolution.
- The developed model offers a computationally tractable approach to simulating material behavior.
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