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crack propagation in thin films

Submitted by bronger on
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Fracture Mechanics Forum
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I work in a thin-film photovoltaics institute.  We deposit 1 µm silicon on glass substrate.  This silicon has tensile stress.

Then, by etching through a tiny hole in the silicon with HF, we underetch the thin layer.  This way, a circular area of the silicon is unattached to the glass.  The circle grows with time. We observe spirals of cracks at these positions.  Sometimes, there's only one spiral, sometimes we see two nested spirals.

Calculating the activity coefficient of aluminium in the solid state as well as in the liquid state.

Submitted by John A. Smith on
research
engineering thermodynamics
Physical metallurgy of metals
oxidation

 

  I am trying to calculate the activity of aluminium in the liquid state or solid state. The bottom line is that I want to know if Aluminium during oxidation is more active in the liquid state than in solid state.If so, how can I prove it.

Viscoelastic RVE for CNT Composites

Submitted by Mohammad Aramfard on
research
elasticity
continuum mechanics
viscoelasticity
Continuum
CNT Composites

Hi
all,

I am Mohammad Aramfard senior student of mechanical engineering and I joined this
great forum yesterday, so I am not very familiar with regulations and rules.

I am working on modeling CNT composites using cylindrical RVE and I found up to
now that there isn`t a viscoelastic RVE for representing behavior of these
composites.

I want to know is there any works done in this field?


And also I have another question, Is there any exact
solution for elastic cylindrical RVEs?

Thank you all,

Help in ABAQUS

Submitted by drmaity on
research
ABAQUS
contact
Coefficient of Friction
temperature-displacement

Dear all,

In my FE model (pin on disc), I would like to define a contact property between pin and disc with a friction defination available in ABAQUS. I have assumed that friction coefficient depends on parameters like slip rate, pressure and temperature only. When i used friction coefficients with slip rate and pressure, model works without any error but if i use friction coefficients with slip rate, pressure and temperature, the model doesn't work and come up with following errors;

Slow-Fast Crack Propagation in Ferroelectric Single Crystals

Submitted by Amir Abdollahi on
research
fracture
evolution of microstructure
finite element methods
ferroelectric ceramics

Dear Colleague,

 

I have uploaded a video which shows the simulation of Slow-Fast crack propagation in ferroelectric single crystals:

http://www.youtube.com/watch?v=6E7WSVOVAWM

 

For technical details, please refer to our recently published paper in Acta Materialia:

http://www.sciencedirect.com/science/article/pii/S1359645411001777

 

Best regards,

Looking for a postdoc position (Thermoelectric material)

Submitted by wanghc on
research
Thermoelectric materials; electrical properties; thermal conductivity; ceramics

I am an engineering doctor of School of Physics in Shandong University, China, graduated in July of 2011. And I have, during the doctor's research period, actively engaged myself in the area of thermoelectric material for 5 years, focusing particularly on the oxide thermoelectric material and module. I keenly desire to obtain a post-doc. Research position in a thermoelectric research group, and further continue the study of thermoelectric.Most of my work has published in peer-viewed journals. So I can do academic writing by myself.

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