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Memory effect on the formation of drying cracks.

Michio Otsuki1

  • 1Department of Pure and Applied Sciences, University of Tokyo, Komaba, Tokyo 153-8902, Japan. otsuki@jiro.c.u-tokyo.ac.jp

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 31, 2005
PubMed
Summary

Plastic deformation in viscoplastic materials before drying influences crack patterns. A new model predicts crack position based on applied force, revealing a threshold that determines if cracks form centrally or off-center.

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Area of Science:

  • Materials Science
  • Physics
  • Rheology

Background:

  • Drying cracks in viscoplastic materials are a common phenomenon.
  • Previous experiments showed drying fracture patterns depend on pre-drying force application.

Purpose of the Study:

  • To propose a model for drying crack formation in viscoplastic materials.
  • To investigate the influence of pre-drying plastic deformation on crack patterns.
  • To analytically predict the position of the first drying crack.

Main Methods:

  • Development of a theoretical model for viscoplastic material behavior during drying.
  • Analytical expression for the first crack's position as a function of applied force.
  • Mathematical analysis of the force threshold influencing crack initiation.

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Main Results:

  • Pre-drying plastic deformation significantly influences drying crack formation.
  • A critical force threshold exists, determining the location of the first crack.
  • Below the threshold, cracks form centrally; above it, they deviate, with deviation increasing linearly with force exceeding the threshold.

Conclusions:

  • The proposed model accurately explains experimental observations of drying crack patterns.
  • The study provides a predictive framework for crack formation in viscoplastic materials under external forces.
  • Understanding this force-dependent crack behavior is crucial for material design and failure analysis.