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Updated: 17 hours 2 min ago

Re: Ghost particle GIFs---interactive?

Mon, 2017-07-31 10:35

In reply to Re: Ghost particles GIFs

AFAIK, no.

GIFs can only embed a sequence of static images, guess also with a spec of how big the time steps can be (perhaps), but it has no provision for embedding logic such as branching. In other words, it can embed only data, no methods. Plus, it certainly has no mechanism for trapping the user input (say mouse clicks). All in all, no interactivity, only a straightforward (sequential) animation possibly with looping, that's all.

--Ajit

Hi Mike!

Mon, 2017-07-31 02:22

In reply to Strength prediction of thin ply laminates: a modelling challenge solved by phase field and finite fracture mechanics

Hi Mike!

 

Or. By both theories, independently, compared to experiments.

Best,

Marco 

Phase field & solid shells for fracture of thin ply laminates

Sun, 2017-07-30 08:16

In reply to Latest progresses on the phase field model for brittle fracture

Dear Mechanicians,

This is a latest application of the phase field approach to fracture implemented in solid shells to predict strength of thin ply laminates with circular holes, compared with experiments and also with the finite fracture mechanics approach:

 

http://www.sciencedirect.com/science/article/pii/S0266353817310552

Just a follow-up on this to

Sun, 2017-07-30 08:07

In reply to Abaqus2Matlab: A suitable tool for finite element post-processing

Just a follow-up on this to let you know that a new version of Abaqus2Matlab has just been released.

This new release constitutes a very significant step forward in the development of this well-known software to connect Abaqus and Matlab.

 

Abaqus2Matlab is now offered as an easy-to-install Matlab App that includes the following novelties:

 

  • The possibility to postprocess not only .fil files, but also .odb and .mtx
  • A new Graphical User Interface (GUI) that enables the user to easily request output variables and automatically creates a Matlab script with all the required information.

 

Everything has been extensively documented, including video tutorials. For more information visit www.abaqus2matlab.com

 

We hope that you enjoy it and we look forward to hearing your feedback

hello,

Sat, 2017-07-29 06:17

In reply to Abaqus VUMAT for hypoplastic law

hello,

have you solve the problem? i have got the same problem, if you have time, we could discuss it together. my e-mail: wangpeixun90619@hotmail.com

Peixun Wang

Re: Ghost particles GIFs

Fri, 2017-07-28 22:51

In reply to Re: Ghost particles

You can create your own GIF by running http://www.parresianz.com/assets/js/particleMigrate.js (and similar code for the other animations) and automating the process using the approach suggested in https://stackoverflow.com/questions/10486084/generate-animated-gif-with-....

Can one create interactive GIFs?

-- Biswajit

Re: Machine learning---its success in an unexpected place...

Fri, 2017-07-28 09:49

In reply to Re: Is machine learning a research priority now in mechanics?

A very late comment, but still, just because something struck me only this late... May as well share it....

I think that, as Biswajit points out, it's a question of matching a technique to an area where it is likely to be "good enough" of a fit.

I mean to say, consider fluid dynamics, and contrast it to QM.

In (C)FD, the nonlinearity present in the advective term is a major headache. As far as I can gather, the nonlinearity has all but been "proved" as the basic cause behind the phenomenon of turbulence. If so, using machine learning in CFD would be, by simple-minded "analysis", a hopeless endeavour---the very idea of using a potential presupposes differential linearity.

But then, consider the role of the BCs and the ICs in any simulation. It is true that if you don't handle nonlinearities right, then as the simulation time progresses, errors are soon enough going to multiply (sort of), and lead to a blowup---or at least a dramatic departure from a realistic simulation.

But then, also notice that there still is some small but nonzero period of time before a sufficiently bad amplification of the errors actually begins to occur. Now what if a new "IC" gets imposed right within that time-period (the one showing "good enough" an accuracy)? In this case, you can expect the simulation to remain "sufficiently" realistic-looking!

Something like that seems to have been the line of thought implicit in the results reported by this paper: [(.PDF) ^]. 

Machine learning seems to work even in CFD, because in an interactive session, a new "IC" is every now and then is manually being introduced by none other than the end-user himself!

It's somewhat like an electron rushing through a cloud chamber. By the uncertainty principle, the electron path sure begins to get hazy immediately after it is "measured" (i.e. absorbed and re-emitted) by a water molecule at a definite point in space. The uncertainty in the position grows quite rapidly. However, what actually happens in a cloud chamber is that, before this cone of haziness becomes too big, comes along another water molecule, and "zaps" i.e. "measures" the electron back on to a classical track. ... The end result is a very, very classical-looking (line-like) path as if the electron were only a particle, not a wave.

Conclusion? Be realistic about how smart "dumb curve-fitting" can at all get. At the same time, also remain open to all the application areas where it can at all be made it work---even in those areas where, "intuitively", you wouldn't expect it to have any chance to work!

Best,

--Ajit

 

Re: Ghost particles

Thu, 2017-07-27 23:59

In reply to Re: Ghost particles

Oh, OK. Should have guessed. The "save image as" was giving .png, not .gif. ... Neat though!

--Ajit

Re: Ghost particles

Thu, 2017-07-27 16:56

In reply to Part 3: The Plimpton scheme for parallel ghost particle exchange

It's all javascript (HTML5 canvas + bits of D3.js).

-- Biswajit

Re: Ghost particles

Thu, 2017-07-27 05:50

In reply to Part 3: The Plimpton scheme for parallel ghost particle exchange

What tool did you use to produce the animation? Matplotlib? something else?

--Ajit

 

 

Engineering analysis with CAD-based macroelements

Sun, 2017-07-23 06:09

In reply to CAD-based precursors of IsoGeometric Analysis

Sharing Information for "Engineering analysis with CAD-based macroelements"  

A link to my new paper is; http://rdcu.be/uoQh

Thanks!

Christopher Provatidis

Engineering analysis with CAD-based macroelements

Sun, 2017-07-23 06:07

In reply to CAD-based precursors of IsoGeometric Analysis

 Sharing Information for "Engineering analysis with CAD-based macroelements"  

A link to my new paper is; http://rdcu.be/uoQh

Thanks!

Christopher Provatidis

Please don't comment about topics you don't understand,!

Fri, 2017-07-21 13:10

In reply to even bigger news: PhD thesis: The earth is flat!

If you have a scientic argument about the experimental validations and/or mathematical proof published in the literature, write a paper in a peer reviewed journal and disprove them. We are waiting !.

Did you understand the math in the paper? 

where was it published?

Fri, 2017-07-21 12:51

In reply to even bigger news: PhD thesis: The earth is flat!

Do you the citation for the earth is flat paper?

Unification of Newtonian Mechanics and Thermodynamics

Thu, 2017-07-20 14:18

In reply to Scientists report solving one of the oldest problems in mechanics

Being able to accurately predict the life span of physical bodies, both living and non-living, has been one of humankind’s eternal endeavors. Over the last 150 years, many attempts were made to unify the field of classical mechanics — the science concerned with the behavior of all physical bodies in the universe — and thermodynamics, the science concerned with the relationships among all forms of energy in the universe, in order to create a generalized and consistent theory of evolution of life-span. Until now, none of these attempts had been successful.

Positions have been filled

Thu, 2017-07-20 11:54

In reply to Postdoc positions in the new group of Pedro Reis at EPFL, Lausanne, Switzerland

These two positions have now been filled and we are no longer accepting post-doc applications.

Is updated lagrangian

Wed, 2017-07-19 21:51

In reply to Question reg ABAQUS-VUMAT and Updated Lagrangian formulation.

Is updated lagrangian formulation automatically toggled while solving in ABAQUS/Explicit wherein NLGEOM is ON by default? 

 

Regards.

Srikanth 

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