Continuum theory of memory effect in crack patterns of drying pastes

Ooshida, Takeshi

doi:10.1103/physreve.77.061501

Cited by 21 publications

(14 citation statements)

References 42 publications

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“…They reported that a preferential crack direction can be made in several types of pastes by shaking a layer of paste before drying. [20][21][22] We investigate the growth processes of quasi-two-dimensional cracks induced by uniform desiccation from the open surface in a thin layer of paste. In this system, cracks are caused by stresses increasing gradually owing to the difference in contraction rate between the paste and the bottom of the container, and are created sequentially to form a typical mud-crack pattern with T-shape intersections in the middle stage of the drying process.…”

Section: Introductionmentioning

confidence: 99%

Crack Propagation Speed in the Drying Process of Paste

Kitsunezaki

2009

J. Phys. Soc. Jpn.

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We investigated crack propagation in the drying process of a thin layer of calcium carbonate (CaCO 3 ) paste experimentally. Cracks are induced by uniform desiccation from the top surface of a layer at the approximately same water content for various drying conditions. We found that the crack speed is a nonlinear increasing function of the drying rate at the cracking time although the tensile stresses arising in the bulk of paste do not depend practically on the drying rate. The crack speed does not depend significantly on the layer thickness and decreases in the cases in which glycerol is mixed to increase the viscosity of paste. These results suggest that dynamical crack growth occurs with viscoplastic relaxation in the vicinity of crack tips.

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Section: Introductionmentioning

confidence: 99%

Crack Propagation Speed in the Drying Process of Paste

Kitsunezaki

2009

J. Phys. Soc. Jpn.

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“…Under such conditions, both the water distribution and elastic deformation of the material can be assumed to be in thermal equilibrium or quasiequilibrium. We also assume that the elastic relaxation is much faster than the redistribution of liquid, and we ignore plasticity, although it is believed to be important for many type of pastes [4,7,8,11,12,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Cracking condition of cohesionless porous materials in drying processes

Kitsunezaki

2013

Phys. Rev. E

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The invasion of air into porous systems in drying processes is often localized in soft materials, such as colloidal suspensions and granular pastes, and it typically develops in the form of cracks before ordinary drying begins. To investigate such processes, we construct an invasion percolation model on a deformable lattice for cohesionless elastic systems, and with this model we derive the condition under which cracking occurs. A Griffith-like condition characterized by a dimensionless parameter is proposed, and its validity is checked numerically. This condition indicates that the ease with which cracking occurs increases as the particles composing the material become smaller, as the rigidity of the system increases, and as the degree of heterogeneity characterizing the drying processes decreases.

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“…Models which take into account plastic deformation of elastic media under external fields can explain the memory effect of vibration. [26][27][28] Here, there is one big question about the other memory effect, namely the ''memory effect of flow'': some pastes remember the direction of vibration and flow, but others remember only the direction of vibration and cannot remember the flow direction. The emergence of the memory effect of flow depends on what kind of colloidal particles we use.…”

Section: Introductionmentioning

confidence: 99%

Effect of Interaction on the Formation of Memories in Paste

Matsuo

Nakahara

2012

J. Phys. Soc. Jpn.

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A densely packed colloidal suspension with plasticity, called paste, is known to remember directions of vibration and flow. These memories in paste can be visualized by the morphology of desiccation crack patterns. Here, we find that paste made of charged colloidal particles cannot remember flow direction. If we add sodium chloride into such paste to screen the Coulombic repulsive interaction between particles, the paste comes to remember flow direction. That is, one drop of salt water changes memory effect in the paste and thereby we can tune the morphology of desiccation crack patterns more precisely.

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Continuum theory of memory effect in crack patterns of drying pastes

Cited by 21 publications

References 42 publications

Crack Propagation Speed in the Drying Process of Paste

Crack Propagation Speed in the Drying Process of Paste

Cracking condition of cohesionless porous materials in drying processes

Effect of Interaction on the Formation of Memories in Paste

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