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Pressurized Cylinder FEM constraint

Dears,

 

I have a cylinder subjected to an internal pressure of 10 MPa, the cylinder diameter is 1400 mm. I am trying to model it in my FEMAP. I am comparing the average stress (TOP and BOT Y) with the stress that come from the formula

hoop_stress=pressure.Radius/thickness

The stress I obtained is similar with the one that is from the formula, but the deformed is not equal, it is crazy !

I am not sure about the constraints I have applied in my FEM model, supposing a cylinder pressurized how the constraints must be set in the free borders ?

Fully funded PhD scholarship in Vienna, Austria. Research topic is the behaviour of granular materials.

Fully funded PhD scholarschip for 3 years is available at the Institute of Geotechnical Engineering, Universität für Bodenkultur, Vienna, Austria. The research topic is the behaviour of granular materials. We expect a candidate with solid background in continuum mechanics and constitutive modelling. Some knowledge of DEM (discrete element method) will be a benefit. This project is financed by the European Commission within its Marie Curie Programme. There are some ten international partners in this project. During the project you will visit our partners in UK, Germany, Holland and France.

Fully funded PhD scholarship in Vienna, Austria. Research topic is the stability of earth slopes of unsaturated soil.

A fully funded PhD scholarschip for 3 years is available at the Institute of Geotechnical Engineering, Universität für Bodenkultur, Vienna, Austria. The research topic is the stability of earth slopes of unsaturated soil. We expect a candidate with solid background in continuum mechanics. Some knowledge in constitutive modelling of soil and numerical analysis (finite element and finite difference) will be a benefit. This is a joint project with Stanford University, USA. The candidate will visit and stay in Stanford for some time. Your thesis will be co-supervised by Prof.

Saint-Venant’s Principle and Its Proof : History and Review

In this article the history of development of Saint-Venant’s Principle is reviewed, referring to the most important events concerning the principle as the historical clue, and the important works and results are evaluated; the view-points that Toupin Theorem can not be considered as a mathematical expression of Saint-Venant’s Principle and that the general Saint-Venant’s Principle does not stand, but modified Saint-Venant’s principles can be proved true are published and explained; the mathematical approaches for eslablishing modified Saint-Venant’s principles are summarized; the significan

Gopinath Venkatesan's picture

Business venture - seeking support from like minded people from India:

I am coming back to India in the September 2009, and with only a month to go, I am thinking about joining likeminded individuals to open up a small consultancy group and see where it goes. We can also teach CAD/FEM side by side (during day time, and work on projects in the evenings/night - flexible times). Presently I am thinking of buying 1 Ansys Professional (which is very expensive, atleast to me) license. If you have other suggestions, please write to me in detail. I look forward to suggestions from the experienced persons.

BoJing Zhu's picture

Castigliano theorem_Strain energy method

PPT file for castigliano theorem(1st & 2nd)_Theory of structures 

T.ZENG's picture

Discuss the derivation and numerical calculation of Eshelby Tensor

 

In the micromechanics, the Eshelby tensor is always encountered. Now, i am trying my best to solve this kind of problem.

The problem confusing me now is an integration about Fourier integral.

If someone has paied attention to this problme, can we discuss together!!!

Thank you very much for your attention!!!

grahamcross's picture

Trinity College (CRANN) Ph.D. Fellowship: Physics of Nanostructure Forming

4 year Postgraduate Fellowship in the School of Physics and the CRANN Nanoscience Institute,Trinity College, Dublin, Ireland

Nanomechanics Group of Dr. Graham Cross (webpage)


Available immediately:  A doctoral fellowship in soft condensed matter physics, with an emphasis on large strain nanoscale deformation and controlled pattern production.

marco.paggi's picture

ECCM 2010 Minisymposium on Fracture and Contact Mechanics for Interface Problems - Paris, France, May 16-21 2010

Dear Colleague,
the IV European Conference on Computational Mechanics-ECCM 2010, Solids, Structures and Coupled Problems in Engineering, organized by ECCOMAS, will take place in Paris, France, May 16-21 2010 (see the Congress website
http://www.eccm2010.org/  for more information).
During this conference, we are organizing a Minisymposium entitled:
 

Zhigang Suo's picture

Haythornthwaite Grants for Students to Attend ASME IMECE 2009

With a generous gift from the Haythornthwaite Foundation, the ASME Applied Mechanics Division will award grants to students presenting their own work at the ASME International Mechanical Engineering Congress and Exposition (IMECE 2009).  The grant will reimburse travel expenses and registration fees, up to $1,000 per student, for up to 10 students.

Deformation Shape doesnt show up

Hi everyone,

well, im glad i found this forum dedicated to abaqus users. i'm just a rookie, got in touch with abaqus in less than a month for my thesis. hope you can help in my first big struggle.

im modeling a nut and a bolt thread in 2d, they should move towards eachother and upon contact they should crash past eachother. i went through all the modules quite ok. i run the job, it is successful. in the visualization window, when i try to see the deformation of the threads the following message is displayed:

Scaling dynamics of seismic activity fluctuations

We study the dynamics of the seismic activity in Mexico within a framework of dynamic scaling approach to time series fluctuations, recently suggested by Balankin (Phys. Rev. E, 76 (2007) 056120).We found that the relative seismic activity and the long-sampled fluctuations of seismic activity both display a self-affine invariance within a wide range of consecutive seismic evens.

Topological crossovers in the forced folding of self-avoiding matter

We study the scaling properties of forced folding of thin materials of different geometry. The scaling relations implying the topological crossovers from the folding of three dimensional plates to the folding of two-dimensional sheets, and further to the packing of one-dimensional strings, are derived for elastic and plastic manifolds. These topological crossovers in the folding of plastic manifolds were observed in experiments with predominantly plastic aluminum strips of different geometry.

How to incorporate 3d models from vtk onto FEM packages?..is there any particular package which supports them?

Hi friends,

I would like to know whether there is a particular FEA package which would incorporate 3d models from vtk on to it, say for example if abaqus incorporates it how do we do it?. Can you please help me in this regard?

 

Bhaskar.R

viscoelastic analysis

HI!

 

I applied constant load on the viscoelastic body.

Now i want to see the displacement of one of the node with respect to time.

Can any body help me in this regard?

 

thank you.

arefin's picture

Forced displacement in ABAQUS

Hello,

I am doing numerical simulation using ABAQUS 6.7. I faced some problem to apply load that will be used as the forced displacement in one face of our model.I used user subroutine for appling load.But, i don't know how to apply forced displacement means the command of forced displacement.

Could you please help me regarding this problem.

Regards,

Arefin

ktramesh's picture

Postdoctoral Position in Fragmentation

We have one postdoctoral position, available in October 2009, in the general
area of fragmentation and dynamic failure. The specific interest is in the timescales and lengthscales associated with the interactions of failure modes in materials. A background in modeling and simulation is essential, while some experience with shock physics is desirable. The successful candidate will become part of a highly collegial and diverse research group with activities in nanomaterials, planetary science and biomechanics. The work involves collaborative research with the Johns Hopkins Applied Physics Laboratory, and US citizenship is required. If you are

ktramesh's picture

Postdoctoral Position in Mesoscale Mechanics

I have one postdoctoral position, available immediately, in the general area of mesoscale modeling. The specific interest is in the development of computationally tractable models that incorporate the appropriate lengthscales and that can be used for microstructural design. The work is in conjunction with research groups involved in the development of materials for impact applications. Examples of topics of interest include the processes of dynamic failure in specific microstructures, and the development of physics-based models that account for grain size, grain size distribution, grain rotation and texture. If you are interested, please send me (ramesh@jhu.edu)
your CV and the names of at least two references. Women and minorities

Heat flux per unit area due to frictional dissipation (ABAQUS)

Hi all

I have a 2D model containing 2 2-D blocks rubbing on each other, producing heat at the interface. (Coupled temperature-displacement analysis in ABAQUS 6.8-1). This works fine, as the temperature on the contact surfaces in increasing.


Now, I want to get the instantaneous the heat flux per unit area due to frictional dissipation as a field output. Is there any standard subroutine or any other way to achieve that? There is no such a variable included in the standard ones.


Thanks!
Andreas

Crack bridging

Hello everybody,

I was reading reading about R-curve behaviour of materials on the web and noticed that "crack bridging" is a considrable cause of this behaviour. but i dont have a clear understanding of this phenomenon and how it affects R-curve behaviour.

i appriciate any help.

thank you.

ansys contact pair

Hi,

 I am new to ansys, does anyone know how can I create a surface to surface contact pair using batch mode. My contact elements are conta172 and targe169 (always bonded). Thank you.

Timoshenko theory

Hi all

I developed a Fnnite element code in Maple for Euler Bernoulli Beam Theory. Then I solved a cantilever beam with a vertical load at the free end. On comparing results with comercially available software, my results are good.

Finally I developd the FE formulation for Timoshenko beam theory. for the same cantilever problem, I introduced a small magnitue of shear modulus but the results are highly different from the Euler-Bernoulli beam.

Can any body explain this?

Temperature differentials in ANSYS

Hi all,

I am modeling pavement in ANSYS. I want to apply temperature differentials of 3 degree F in/in in layers. how can i do that?

Also if anyone knows the modeling of pavement in ANSYS, can you help me more?

Thanks

mahesh mane's picture

Phisical significance of ENTROPY

I got that there exist a property called ENTROPY;for which the difference in it's values at two states is (Q/T).but I can't get it's physical significance

   I know that it represents the irreversibility of the process.But it doesn't sutisfy me.So if anyone can...

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