research

Calculate height of hydraulic fracture

Submitted by Kan Wu on Wed, 08/24/2011 - 14:56

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I need to calculate the height of hydraulic fracture using P3D and the width in the vertical direction. The width in the lateral direction is computed by displacement discontinuity method. These two widthes are totally different calculated by my coding. Please give me some advice.

crack propagation in thin films

Submitted by bronger on Tue, 08/23/2011 - 13:37

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Fracture Mechanics Forum

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research

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.

Reversible nanopore formation in Ge nanowires during lithiation-delithiation cycling: an in situ TEM study

Submitted by Jianyu Huang on Tue, 08/23/2011 - 00:14

pore memory effect (PME)

reversible volume change

Nano Lett. 2011, DOI: 10.1021/nl2024118

Open source finite element code that deal with contact....

Submitted by rezneffix on Mon, 08/22/2011 - 09:26

I am looking for any open source finite element codes that may be out there that deal with contact mechanics.

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

Submitted by John A. Smith on Sun, 08/21/2011 - 22:57

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 Sat, 08/20/2011 - 20:03

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,

Length Scales in Fracture

Submitted by W. Brocks on Sat, 08/20/2011 - 11:30

research

Ductile fracture; Aluminum alloy; Damage plasticity theory; Crack propagation

Help in ABAQUS

Submitted by drmaity on Sat, 08/20/2011 - 10:22

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;

Discussion of fracture paper #3 - Length scales in fracture

Submitted by ESIS on Fri, 08/19/2011 - 22:00

research

Ductile fracture; Aluminum alloy; Damage plasticity theory; Crack propagation

H. Krull and H. Yuan: Suggestions to the cohesive traction–separation law from atomistic simulations. Engineering Fracture Mechanics, Vol. 78, 2011, pp. 525-533.

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