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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

The Center for Modeling, Simulation and Imaging in Medicine (CeMSIM) at Rensselaer Polytechnic Institute, Troy, NY, USA invites
applications for multiple positions (Research Assistant Professor,
Research Scientist/Research Associate, postdc) to work on projects
funded by the NIH on developing interactive computational technology.  Desirable background for this position
includes:

 The article entitled “Effect of geometric parameters on the stress distribution in Al 2024-T3 single-lap bolted joints” published in International Journal of Structural Integrity 

has been chosen as an Outstanding Paper Award Winner at the Literati Network Awards for Excellence 2013.

Moredetails can be found :

Applications are invited for few open positions in the area of
multiscale simulation of fatigue and fracture of advanced alloys and
nano-material based composites. Primary focus of this research is investigation
of fatigue and fracture behavior of nanomaterials and to develope various
constitutive models for continuum, based on large scale atomistic simulations.
Research effort will include development of analysis and design methods toward
improving material/structural behaviour using computer simulation. Interested
candidates should have preferably MTech/ME degree in
mechanical/civil/aerospace/material engineering discipline with good knowledge

We simulate the fracture processes of ferroelectric polycrystals in
three dimensions using a phase-field model. In this model, the grain
boundaries, cracks and ferroelectric domain walls are represented in a
diffuse way by three phase-fields. We thereby avoid the difficulty of
tracking the interfaces in three dimensions. The resulting model can
capture complex interactions between the crack and the polycrystalline
and ferroelectric domain  microstructures. The simulation results show
the effect of the microstructures on the fracture response of the
material. Crack deflection, crack bridging, crack branching and
ferroelastic domain switching are observed to act as the main fracture
toughening mechanisms in ferroelectric polycrystals. Our fully 3-D

The velocity and instability of crack motion in 2D hexagonal lattice of graphene under pure opening loads

are investigated by atomistic molecular dynamics simulations. The brittle crack along zigzag direction

in a strip can propagate supersonically at even 8.82 km/s under uniform normal loading of edge

displacements. Crack moving straightly at low speeds produces atomically smooth edges, while kinking

occur beyond a critical speed around 8.20 km/s equivalent to 65% of Rayleigh-wave speed in graphene,