cerco aiuto con ansys workbench

[RiccarDoc95]

Hello everyone, I'm new in the forum and I don't know if you have to show up before, but I haven't found any posts about it.
I open this new message because I'm looking for someone who knows how to use ansys workbench and is available to make videos behind compensation. This is because I'm doing the thesis and I'm very tight with the times.

 

[meccanicamg]

Can't you use a much simpler and less complicated fem?
If you use it for the thesis, it is believed that you did courses at university and in the company where you did the internship they made you use it.
if it is not so risk of showing what is not there.
But learning new things is always positive....but not in such tight times.

 

[RiccarDoc95]

thank you for the answer first.
the problem is that the use of ansys was "recommended" by the professor and I would not want to slip the degree for bureaucratic problems. That's why I was looking for someone who could direct me in the right direction and make me feel sensitive to the results.

 

[meccanicamg]

and....your prof " advised you" also the purchase of the license?
I've been getting sick of licenses, paid programs and anything, so at work licenses buy my owner....out of work, free or open source programs are used.

at present, use for modeling 3d freecad

with its integrated mechanical and thermal fem module, with the addition of the new version of calculix to manage mesh point survey representations and this looks a lot like abaqus, having the same programming language.

then there are a lot of other open source fems but you need to be too slender.
normally, for fem analysis, integrated simulators for example in solidworks are excellent. I have always used cosmos floworks for fluid dynamic analysis integrated in solidworks with dedicated license and symulation solidworks for static and dynamic fem analysis as well as fatigue and not linear with the various licenses for the various modes.

the software setup find it here http://www.cad3d.it/forum1/threads/strumenti-free-modellazione-e-fem-3d.49421/here a pushed example of fem for study according to fatigue verification https://www.cad3d.it/forum1/threads/verifica-saldature-eurocodice-3-hot-spot-sress.52443/Cosa become simulation?

 

[meccanicamg]

of tutorials on the net I know or many.http://www.google.com/search?q=ansy...4.mobile-heirloom-serp..0.13.1519.xcpkplyboukbut you need to understand if you can't use the program or you can't do a fem analysis.
It's two very different things.

 

[RiccarDoc95]

ansys has a free version that I have to do is enough.
My problem is that since I was three years old I did not take exams about the fem analysis and so I would like to have an overview of what I am doing and the results that can come out of it. Unfortunately I don't have great difficulties using the software, but I don't have control of the means I'm using. I can't trust the results that come out without understanding how the tool I'm using is working. I was looking for someone to direct me in the right direction with the good mix between practice and theory.

 

[volaff]

if you are looking for youtube find many tutorials. I also found a quite complete course, but as they already told you, it takes time.
I learned to use the apdl version, and for what little I did, it took months.

 

[meccanicamg]

Why did we learn to beat our noses alone with the things they didn't explain to us? the fem I used it already before doing the university to check some little object under effort....reduce of the course of mechanics to theitis.
ansys is not easy in the setting and that's why I told you if you have to use this program.
especially for "normal" things is better a program that:
- makes you choose the linear isotropic material (steel and simi)
- makes you choose the mesh size and fineness, whether solid or not (tetrahedron, shell etc)
- makes you put loads and constraints (forces, moments, inks, customizable reactions)
- click and resolve and show you results

the standard procedure, or better the approach is to leave everything medium coarse like mesh and throw everything. the first solution is observed and investigated if it reacts as we hypothesized. if we continue to analyze specific localized stresses, if not we must model loads and constraints differently.
if the thing works, it sticks the mesh locally or total (if the computer allows it....occur a lot of mb) so that the structural thicknesses have at least 3 or more units of meshatura that make it up to have a realistic reliability.
The square refinement setting allows you to achieve a realistic mesh with realistic results because in critical areas it is more inflated than in the size of local objects, providing more analysis nodes.
If something goes down, like multibody sheets and see that some pieces fly is because there is no contact between the bodies and the edges do not touch, so it is necessary to remodel because the simulated solution is wrong.
If possible, with multi-body plates, with strange geometries in contact, you can create non-congruent mesh, if the standard ones fail to get a mesh on the two different bodies so that they do not decay the knots in the abnormal contact zone.
the skin or localized effect should be analyzed very well because the risk of seeing huge tensions not real is high and in those areas it must be evaluated time for time if remodeling the load and its point of application or excluding the knots and then take a sort of average value... .or if you really want to probe the values for example above (find main tensions at the base of a weld to use the numbers to give fatigue verification to standard) you will need to fix the mesh with linear criteria or unless you can normally find on specific industry documents such as iiw and others.

all this is true for structural fems.

 

[RiccarDoc95]

You got the point. ansys workbench module does what you described in the first part. As for the second part of the message this was just the kind of straight I was looking for. Unfortunately, not having had much to do with this type of analysis I do a little hard to follow, but already understand how and when a mesh is done well I would be very helpful. I would like to know those theoretical things behind the fem analysis, which allow me to have a conscience on what I am doing.
For this reason and for the lack of time I was willing to pay some repetitions on the subject.

 

[meccanicamg]

the part of theory the pupi read on pages and pages and pages of books that then serve only to who, and not entirely, builds calculation codes. for all of us ordinary mortals who take the instrument and feed it a model, we want results in a fast and practical way.
the main things I have marked them in the post above.
so at this point you should post the fems, pictures so we can comment. Give us some information about size and load spectrum and what you want to analyze and see together whether or not it makes sense.
tea the many things....if it is worth or not to use the modeling as a beam or as solid, if to apply the own weight and then the gravitational effect or not, if to meshare to squares of 100 mm or 1 mm...

 

[RiccarDoc95]

Thank you very much. As soon as I get ahead with the real work (currently I have done tests on generic pieces) I will certainly look for your opinion. Now I will focus on what you wrote and try to understand it well. Thanks again

 

[meccanicamg]

Please. Here, a small calibration you can do on framed beams and compare with hand calculation. Usually enough to calibrate and understand the values of the fem as they behave.