User login

You are here

Konstantin Volokh's blog

Konstantin Volokh's picture

Postdoctoral position at the Technion

A new postdoctoral fellow position will start on 1 November 2017 at the Technion – Israel Institute of Technology.  The position is in the area of theoretical and computational modeling of failure in soft solids.  The potential candidate should have a Ph.D.

Konstantin Volokh's picture

On cavitation in rubberlike materials

Microscopic voids can irreversibly grow into the macroscopic ones under hydrostatic tension. To explain this phenomenon it was suggested in the literature to use the asymptotic value of the hydrostatic tension in the plateau yield-like region on the stress-stretch curve obtained for the neo-Hookean model. Such an explanation has two limitations: (a) it relies on analysis of only one material model and (b) the hyperelasticity theory is used for the explanation of the failure phenomenon.

Konstantin Volokh's picture

Understanding the strength of bioinspired soft composites

Remarkable mechanical properties of biocomposites (bone, teeth, shell, antler etc.) are usually attributed to their special design where staggered mineral platelets are embedded in a protein matrix. Because of the high aspect ratio of the platelet the soft protein deforms in the shear mode predominantly providing the linkage for the hard inclusions. Mimicking Nature one might design materials with a similar architecture. 

Konstantin Volokh's picture

Fracture as a material sink

Cracks are created by massive breakage of molecular or atomic bonds. The latter, in its turn, leads to the highly localized loss of material, which is the reason why even closed cracks are visible by a naked eye. Thus, fracture can be interpreted as the local material sink. Mass conservation is violated locally in the area of material failure. We consider a theoretical formulation of the coupled mass and momenta balance equations for a description of fracture.

Konstantin Volokh's picture

Deterioration of the quality of the Elsevier journal printing

Many Mechanics journals are printed by Elsevier. Unfortunately, I observe huge deterioration of the quality of the printing. 

Konstantin Volokh's picture

Aneurysm rupture

Aneurysms are local dilations of the arterial wall that are prone to rupture with high mortality risks. The biochemical mechanism of the aneurysm development is not clear. The mechanical mechanism of the aneurysm rupture is not clear either. I attach three papers that study two possible mechanisms of the aneurysm rupture.

Konstantin Volokh's picture

Postdoctoral position at the Technion

A new postdoctoral fellow position will start on 1 November 2015 at the Technion – Israel Institute of Technology.  The position is in the area of theoretical and computational modeling of dynamic failure in soft solids.  The potential candidate should have a Ph.D.

Konstantin Volokh's picture

Navier-Stokes model with viscous strength

In the laminar mode interactions
among molecules generate friction between layers of water that slide with
respect to each other. This friction triggers the shear stress, which is
traditionally presumed to be linearly proportional to the velocity gradient.
The proportionality coefficient characterizes the viscosity of water. Remarkably,
the standard Navier-Stokes model surmises that materials never fail – the transition
to turbulence can only be triggered by some kinematic instability of the flow. This
premise is probably the reason why the Navier-Stokes theory fails to explain

Konstantin Volokh's picture

Challenge of Biomechanics


The application of mechanics to biology
– biomechanics – bears great challenges due to the intricacy of living things.
Their dynamism, along with the complexity of their mechanical response (which
in itself involves complex chemical, electrical, and thermal phenomena) makes
it very difficult to correlate empirical data with theoretical models. This
difficulty elevates the importance of useful biomechanical theories compared to
other fields of engineering. Despite inherent imperfections of all theories, a

Konstantin Volokh's picture

Crack thickness


Macroscopic
cracks do not appear as a result of an ideal separation of two adjacent atomic
layers. Just the opposite, cracks appear as a result of the development of
multiple micro-cracks triggered by the massive breakage of atomic bonds. The microcracking
and the bond breakage are not confined to two neighbor atomic planes: the
process involves thousands atomic planes within the representative characteristic
volume of size h
. This size defines the width (not the lenth) of the damage
localization zone and it can be called the crack thickness. The knowledge of

Konstantin Volokh's picture

On Tensegrity in Cell Mechanics

All models are wrong, but some are useful. This famous saying mirrors the situation in cell mechanics as well. It looks like no particular model of the cell deformability can be unconditionally preferred over others and different models reveal different aspects of the mechanical behavior of living cells. The purpose of the present work is to discuss the so-called tensegrity models of the cell cytoskeleton. It seems that the role of the cytoskeleton in the overall mechanical response of the cell was not appreciated until Donald Ingber put a strong emphasis on it.

Konstantin Volokh's picture

Barenblatt's paper

I attach Barenblatt's paper which is difficult to access. The paper includes a milestone idea of the cohesive surface that  allows us to get rid of unphysical singularities in the older formulations of fracture mechanics.

Konstantin Volokh's picture

Mechanics of Soft Materials: Lecture Notes

I finished the grad course on Mechanics of Soft Materials. It took 14 weeks with 2 academic hours per week and it covered the following topics: 1 Tensors 2 Kinematics 3 Balance laws 4 Isotropic elasticity 5 Anisotropic elasticity 6 Viscoelasticity 7 Chemo-mechanical coupling 8 Electro-mechanical coupling.

I attach the class notes and I will be grateful for the remarks, corrections, and criticism from iMechanicians.

Konstantin Volokh's picture

Journal Club Theme of September 2009: Elasticity and Failure

Let us consider interaction of two atoms/molecules/particles. The reference distance between them corresponds to zero interaction force and zero stored energy. The interaction passes three stages with the increase of the distance. At the first stage the force increases proportionally to the increasing distance: the linear stage. At the second stage the force-distance relationship deviates from the linear proportionality: the nonlinear stage. At the third stage the force drops with the increasing distance: the separation or failure stage.

Konstantin Volokh's picture

Nice and low-cost introductory texts

There are two very nice companion texts on continuum mechanics and nonlinear elasticity printed by Dover recently: "Continuum mechanics" by Spencer and "An introduction to the theory of elasticity" by Atkin and Fox. Great and fairly affordable reading!

Konstantin Volokh's picture

Mechanics of growth and rupture of abdominal aortic aneurysm

We present a coupled mathematical model of growth and failure of the abdominal aortic aneurysm (AAA). The failure portion of the model is based on the constitutive theory of softening hyperelasticity where the classical hyperelastic law is enhanced with a new constant indicating the maximum energy that an infinitesimal material volume can accumulate without failure. The new constant controls material failure and it can be interpreted as the average energy of molecular bonds from the microstructural standpoint.

Konstantin Volokh's picture

Prediction of arterial failure

We enhanced a bi-layer fiber-matrix microstructural arterial model with softening and analyzed the artery inflation under the internal pressure. Numerical simulations lead to the following three findings. Firstly, it is found that the fiber strength dominates the strength of the media layer. Secondly, it is found that the strength of the media layer dominates the overall arterial strength and plays the crucial role in the load-bearing capacity of arteries. Thirdly, it is found that residual stresses can increase the overall arterial strength significantly. The pre-existing compression in arteries delays the onset of rupture like the pre-existing compression in the pre-stressed concrete delays the crack opening.

Konstantin Volokh's picture

Equilibrium equations for large deformations

Lagrangian or referential equilibrium equations for materials undergoing large deformations are of interest in the developing fields of mechanics of soft biomaterials and nanomechanics. The main feature of these equations is the necessity to deal with the First Piola-Kirchhoff, or nominal, stress tensor which is a two-point tensor referring simultaneously to the reference and current configurations.

Konstantin Volokh's picture

Griffith controversy

Using the Griffith energy method for analysis of cavitation under hydrostatic tension we conclude that the critical tension tends to infinity when the cavity radius approaches zero (IJSS, 2006, doi: 10.1016/j.ijsolstr.2006.12.022). The conclusion is physically meaningless, of course. Moreover, if we assume that the failure process occurs at the edge of the cavity then the critical tension should be length-independent for small but finite cavities while the Griffith analysis always exhibits length-dependence. The main Griffith idea - introduction of the surface energy - is controversial because it sets up the characteristic length, say, surface energy over volume energy. By no means is this approach in peace with the length-independent classical continuum mechanics.

Pages

Subscribe to RSS - Konstantin Volokh's blog

Recent comments

More comments

Syndicate

Subscribe to Syndicate