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Commonality between viscoelastic phase separation and mechanical fracture
Published on Oct 08, 20123848 Views
Phase separation is one of the most fundamental phenomena that create spatially inhomogeneous patterns in materials and nature. It has so far been classified into three types: (i) solid, (ii) fluid, a
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Chapter list
Commonality between viscoelastic phase separation and mechanical fracture00:00
Main Contributors00:31
From "Phase" Separation to Fracture01:16
Phase Diagram02:08
Normal Phase Separation: Well-understood03:34
The validity of model H04:46
Dynamically Asymmetric Mixtures06:03
"Phase" Separation (1)07:13
Viscoelastic Phase Separation in Polymer Solutions07:17
Samples and experimental methods07:25
Dependence of phase-separation patterns on T and φ (1)08:04
Viscoelastic PS (experiments)08:43
Phase inversion09:27
This is reminiscent of colloid aggregation!12:00
Universality of Viscoelastic Phase Separation12:44
Self-organization of phaseseparating lyotropic liquid crystal into cellular, network, and droplet morphology13:36
Lamellar nucleation in the coexistent region13:47
Network phase separation (NPS): rapid14:33
Cellular phase separation15:15
The origin of CPS16:14
Universality of VPS16:50
VPS in Any Liquid Matter!?17:15
Fracture Phase Separation18:17
Dependence of phase-separation patterns on T and φ (2)18:26
Observation in larger scale18:33
Fracture Phase Separation in a Polymer Solution19:33
A link to shrinkage crack patterns20:00
Dynamic asymmetry (mobility contrast)20:29
New simulation method of colloidal suspensions including hydrodynamic interactions21:02
Animation of Colloidal Aggregation21:25
Elementary process of coarsening22:53
Phase separation process in 3D23:41
Flow with transverse nature, which is favored under the incompressible condition24:34
Langevin equations based on two-fluid model25:29
Constitutive equation of polymer solution26:58
Our Scenario of VPS (1)27:57
Our Scenario of VPS (2)29:08
Constitutive Equation in the Unstable State of a Mixture29:22
Pattern evolution in Viscoelastic PS (2D)29:58
Wthout stresses / With bulk and shear stresses30:22
Viscoelastic: PS Bulk+shear30:47
Fracture phase separation (1)30:54
Fracture phase separation (2)31:19
Three types of mechanical fracture (1)31:22
Three types of mechanical fracture (2)31:49
Fracture phase separation32:06
Selection of the kinetic pathway in Phase Separation32:29
Applications of Viscoelastic PS33:12
Viscoelastic PS / Elastic PS34:03
Various network patterns in Nature35:38
"Phase" Separation (2)35:57
Mechanical Instability in Phase Separation36:03
Shear-induced cavitation in a simple liquid36:32
Flow-induced "Fracture" in Simple Liquid36:38
Low Reynolds number flow (Very viscous liquids)37:07
Dynamic coupling between simple shear flow and density fluctuations?38:23
Mechanism of shear-induced Instability (1)38:56
Mechanism of shear-induced Instability (2)39:59
Linearized equation of motion of volume dilation rate40:09
Intuitive explanation on the mechanism of shear-induced instability of a liquid41:13
Comparison with Experiments42:35
New important rheological time scale43:31
Generalization to fracture of glassy materials under shear44:25
Mechanism of instability (1)44:33
Mechanism of instability (2)45:10
Criteria of mechanical instability for liquid, viscoelastic and elastic matter45:11
Ductile Fracture45:41
Liquid-type instability46:26
Brittle fracture46:57
Comparison with experiments 3. Polymer glass (PMMA)47:11
General Picture47:58
Universal description of Inhomogeneization ("Phase" Separation)49:27
Dynamic asymmetry (for change of OP)49:49
Universal description of inhomogeneization on the basis of "Phase" Separation51:07
Thank you!51:15