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Commonality between viscoelastic phase separation and mechanical fracture
Published on 2012-10-083870 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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Presentation
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