[aiutatemi!] femap express

[bazzy]

I need an aito with femap express, indeed, I would say almost that I have a course!

I'm not an engineer and I can't figure out how to interpret the results, but above all:

-What is the load measurement unit applied?

is there any guide!? I don't think so.
some pious soul that makes me as a teacher (behind reward of course. . ! ?

 

[Tequila]

I need an aito with femap express, indeed, I would say almost that I have a course!

I'm not an engineer and I can't figure out how to interpret the results, but above all:

-What is the load measurement unit applied?

is there any guide!? I don't think so.
some pious soul that makes me as a teacher (behind reward of course. . ! ?

I don't know about manuals for femap express. the only fairly simplified guide you find only in online help

for the measuring unit depends on the single par or psm file you go to analyze.
to change it open file properties, go to advanced units/measure units
and find them the force field where you impose the type of unit.

for interpretation apart from visually seeing the most stressed areas, neither am I engineer... Then it depends on the complexity of the piece if you use a finer or coarse meshatura lattice, as you go to bind it and apply forces.

Try making a simple beam and step by step the points that are required to you in the femap calculation stage so you get an idea.

Hi.

 

[cacciatorino]

Try making a simple beam and step by step the points that are required to you in the femap calculation stage so you get an idea.

Yeah, that's a good idea. a beam stressed to traction or compression (as when you buy the new calculator and do 2+2 = 4 to see if it works well).

 

[Be_on_edge]

for a good finite element analysis is fundamental:

- correctly set the simulation model
- interpret the results correctly

for both things needs experience, especially for the second very related to the type of product analyzed.

Hi.

 

[bazzy]

for a good finite element analysis is fundamental:

- correctly set the simulation model
- interpret the results correctly

for both things needs experience, especially for the second very related to the type of product analyzed.

Hi.

...but when there is no experience, there is a lot to learn! ! !
I have it, but I don't find the "master"!!! :finger:

 

[gerod]

the desire to learn must be there but it also takes a minimum of preparation and study.
1. femap express is good for simple tricks, very simple because it is very simplified and often, on things not so messed up, it goes in crisis.
2. it would be better to use other fems for more complicated things (even the same femap)
3. It is not so simple to learn how to make simulations. taking a crab is simple, I think it takes a minimum of preliminary study on what is a numerical calculation (theory, formulas, matrices, elements, mesh, errors, etc.)
a good book to learn? There's a bizzeffe, maybe a few in ita.
Hi.

 

[bazzy]

the desire to learn must be there but it also takes a minimum of preparation and study.
1. femap express is good for simple tricks, very simple because it is very simplified and often, on things not so messed up, it goes in crisis.
Hi.

...of course I was talking about simple details.
I often find myself having to valuatre the thickness of the sheet for small parts of minutery.
I know I have a tool that can help them, but I can't use it, it's sad enough not to find!? (also because I finally have to rethink it anyway)

 

[radio]

I am not an expert but sometimes femapexpress I used it too; In fact its use is quite simple, also because it offers few choices, and precisely for this reason if the schematization of loads and constraints does not reflect the reality also the results will.
However, first remember that the simulation of a sheet metal part requires that you have got a medium surface, otherwise you can't do anything; do this you start the femapexpress module.
1- Select the average surface
2- Select the type of analysis (tension)
3- Selecting the material
4- apply one or more loads by choosing between force and pressure (attention to units of measurement!), and choosing point of application and direction.
5- Select the edges (or faces for .par) that will be bound (set).
at this point you start the meshatura, in the case of surface .psm, and simulation.
However, beware of the numerical result obtained, keep in mind that the constraints applied are perfect frames, but reality is always a little (or a lot) different, the loads always keep the direction set even if the deformed part; in general these progresses give good results for small shifts, but in case of remarkable deformations can "bear" a lot.

 

[bazzy]

I am not an expert but sometimes femapexpress I used it too; In fact its use is quite simple, also because it offers few choices, and precisely for this reason if the schematization of loads and constraints does not reflect the reality also the results will.
However, first remember that the simulation of a sheet metal part requires that you have got a medium surface, otherwise you can't do anything; do this you start the femapexpress module.
1- Select the average surface
2- Select the type of analysis (tension)
3- Selecting the material
4- apply one or more loads by choosing between force and pressure (attention to units of measurement!), and choosing point of application and direction.
5- Select the edges (or faces for .par) that will be bound (set).
at this point you start the meshatura, in the case of surface .psm, and simulation.
However, beware of the numerical result obtained, keep in mind that the constraints applied are perfect frames, but reality is always a little (or a lot) different, the loads always keep the direction set even if the deformed part; in general these progresses give good results for small shifts, but in case of remarkable deformations can "bear" a lot.

ok, until here I arrive quietly (except the fact of remembering to go to see each time the unit of measure force coem is set).
the problem is that I can't read the results! !
a friend of mine graduated in engineering tried to explain it to me in solid works, but honestly I didn't understand well since then I don't get back.. .

 

[Tequila]

ok, until here I arrive quietly (except the fact of remembering to go to see each time the unit of measure force coem is set).
the problem is that I can't read the results! !
a friend of mine graduated in engineering tried to explain it to me in solid works, but honestly I didn't understand well since then I don't get back.. .

for the measuring unit is simple, if as I told you to go to change in properties/measure units.... if you do this on templates you use to model, then by default they will always be those.

I don't think you're moving from one model to another from kg to n to mpa.
Hi.

 

[bazzy]

for the measuring unit is simple, if as I told you to go to change in properties/measure units.... if you do this on templates you use to model, then by default they will always be those.

I don't think you're moving from one model to another from kg to n to mpa.
Hi.

... depends on how many evidence you have done on the already drawn pars!! :tongue:

cmq, my problem is to be able to interpret the results.

 

[radio]

Attached you will find an express femap report that I believe will help you.
in this document you can see:
the data of the analyzed part.
material properties.
the number of loads applied and their intensity
number of constraints.
property of mesh.
voltage results, where you can read the value of the minimum voltage and where it is located, and the value of the maximum and its location; below you find an image with the representation of the colored piece, and in part a color scale that reports the association tension-color where the minimum voltage corresponds to the magenta color and the maximum to the red.
shift results with minimum and maximum values etc.
safety coefficient obtained by dividing the yielding load (see material properties) for voltage.
I hope I helped you, bye.

 

[bazzy]

I hope I helped you, bye.

...you're helping me a lot! although I actually miss the base to get to the bottom.. .

However, in the meantime I know in your report the units of measurement that in my not there are, then, made all this speech, according to you what conclusions can we draw from this femap report!?

I will be able to draw conclusions in the future when I don't even know what a "safety coefficient" is? !

I attach my femap report

 

[Be_on_edge]

we take for example the values of tensions. It is wrong to read them in an absolute way, but they must be interpreted according to the area where they are, to the size and direction.

you may have some points over the yielding voltage, and be acceptable cmq as localized spikes. or whole areas within the plastic zone, and other acceptable for the effect of plasticization of the material.

software these things can show you numerically but you must be able to tell if they are acceptable.

and to do this it takes at least someone who introduces you to the subject. to expand and deepen then with time and experience.

p.s.: I'm not a fem expert, I'm just telling you the little I learned over the years. :redface:

 

[cacciatorino]

we take for example the values of tensions. It is wrong to read them in an absolute way, but they must be interpreted according to the area where they are, to the size and direction.

you may have some points over the yielding voltage, and be acceptable cmq as localized spikes. or whole areas within the plastic zone, and other acceptable for the effect of plasticization of the material.

software these things can show you numerically but you must be able to tell if they are acceptable.

All right, in order to thoroughly assess the question of tension peaks, a non-linear analysis should be done by introducing to the curve of the sigma-epsilon material, which with femap express I think is impossible.

 

[gerod]

but not linear only if you are beyond the limit of proportionality, otherwise you do not need.
if you find tensions beyond the limit of proportionality means that you are hurt! It doesn't break but you could riot!
the femap express tells you only (number) that you could also find values >235 mpa. if you do a linear analysis and get values > 235 mpa you can only say that the piece disconnects but the behavior you get is wrong because the program considers the tension linearly to the deformation. Then you need the non-linear.

 

[cacciatorino]

but not linear only if you are beyond the limit of proportionality, otherwise you do not need.
if you find tensions beyond the limit of proportionality means that you are hurt!

Actually, things aren't that simple, it often happens that a small localized plasticization also happens in reality, allowing you to distribute the effort in adjacent areas.
Linear analysis is good for a first-level evaluation, but then for more detailed evaluations non-linear is advisable, even if it involves an explosion of calculation times and complexity of the analysis setting.

 

[gerod]

Linear analysis is good for a first-level evaluation, but then for more detailed evaluations non-linear is advisable, even if it involves an explosion of calculation times and complexity of the analysis setting.

and you have forgotten also costs, a linear fem costs x, the linear one costs at least double.
Do we make a test? you make me an account with silhouettes with the linear nuo, I with ansys and see if the results differ a lot?