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Mechanism of memory effect of paste which dominates desiccation crack patterns
Akio Nakahara1, Tomoki Hiraoka2, Rokuya Hayashi2
1College of Science and Technology, Nihon University, 7-24-1 Narashino-dai, Funabashi 274-8501, Japan nakahara.akio@nihon-u.ac.jp.
Summary
Densely packed pastes remember past motion, influencing crack patterns during drying. Experiments show that initial vibrational memory is overwritten by nonlinear effects with repeated exposure, revealing complex fracture dynamics.
Area of Science:
- Physics
- Materials Science
- Rheology
Background:
- Colloidal suspensions (pastes) exhibit plastic fluid behavior.
- Pastes can retain memory of past motion (vibration, flow).
- This memory is observable in crack patterns formed during drying.
Purpose of the Study:
- Investigate the mechanism of memory effect in pastes subjected to vibrational motion.
- Explore how to rewrite the memory of vibrational motion in pastes.
- Understand the interplay between quasi-linear and nonlinear effects in memory imprinting.
Main Methods:
- Experimental manipulation of colloidal suspensions (pastes).
- Application of controlled vibrational motion to pastes.
- Analysis of crack morphology during the drying process.
- Investigation of memory rewriting by applying additional vibrations.
Main Results:
- Crack patterns in dried pastes reflect the direction of prior vibrational or flow motion.
- The memory of vibrational motion can be overwritten by applying new vibrations.
- Initially, quasi-linear effects dominate memory imprinting, but nonlinear effects become dominant with repeated vibrations.
Conclusions:
- Pastes possess a memory effect influenced by their past motion.
- The process of imprinting and rewriting vibrational memory involves a competition between quasi-linear and nonlinear mechanisms.
- Nonlinear effects play an increasingly significant role in memory imprinting as paste vibration continues.
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