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Related Experiment Video

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Moving cracks in drying colloidal films.

Atiya Badar¹, Mahesh S Tirumkudulu¹

¹Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India. mahesh@che.iitb.ac.in.

|March 4, 2022

Summary

This study models dynamic crack propagation in drying colloidal films, crucial for materials like paints and ceramics. The analytical solution reveals crack speeds significantly higher than experimental observations, prompting further investigation into drying dynamics.

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Area of Science:

Materials Science
Physics
Chemical Engineering

Background:

Drying colloidal films are vital in paints, coatings, ceramics, and semiconductors.
Shrinkage stresses during drying can lead to film fracture.
Limited research exists on the dynamics of crack propagation in these systems.

Purpose of the Study:

To derive an analytical solution for stress, displacement, and pressure fields near a moving crack tip in drying colloidal films.
To analyze crack dynamics under different flow regimes (undrained, drained, and intermediate).
To incorporate micro-structural and mechanical properties into the model.

Main Methods:

Development of an analytical solution for crack tip fields.
Analysis of two extreme cases: undrained (fast crack motion) and drained (slow crack motion).
Consideration of the general case where crack motion timescale matches interstitial flow timescale.

Main Results:

The model predicts stress, displacement, and pressure fields near a steadily moving crack tip.
Results are consistent with brittle material behavior.
Predicted crack speeds are an order of magnitude higher than experimental values.

Conclusions:

The analytical model provides insights into crack dynamics in drying colloidal films.
A significant discrepancy exists between predicted and experimentally observed crack speeds.
Further research is needed to understand the reasons for this speed difference, potentially related to material properties or drying physics.