Steven,
Il faut naviguer sur les titres et les différentes années en allemand.
Need to browsetitlesanddifferentyearsinGerman.
https://www.tu-chemnitz.de/mb/MHT/SAXSIM/Archiv/index.php#2015
Denis
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Re: Creo Simulate vs ANSYS Workbench contact analysis w. friction.
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Re: Automate Analysis (FEA and CFD) in Product Development
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Re: Creo Simulate vs ANSYS Workbench contact analysis w. friction.
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Re: Plastic deformation
Les "patins" dans "deformation.jpg", est-ce qu'ils sont des billes, ou des "jantes" avec le même axe de symmetrie comme le fût? Si le problême est 2D symetric, je crois c'est assez facile a modelilser, si les patins sont des "billes" c'est plus difficile...
Supposant qu'ils sont des "billes" j'ai fait ce model (joint ci dessous) avec elements grands et analyse "quick check".. Je n'ai pas encore fait des mesures pour trouver les forces, mais ca ne doit pas etre trop difficile.
/The "patins" are they balls or are they rims with the same symmetry axis as the barrel? If its 2D axisymmetric then it should be easy, more difficul if they are balls.
Assuming they are balls, I have here made a try with coarse mesh and "Quick check analysis". I have not yet made measures for forces, but that should not be too difficult.
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Re: Plastic deformation
Mats,
Whoua, merci pour cette approche, je vais me renseigner sur l'outillage à disposition ou celui à fabriquer.
Whoa,thanksforthisapproach,I'llfind outonthe toolsavailableorthattomake.
Denis
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Re: Plastic deformation
Quelque chose ne va pas avec ce fichier; peut être le site ne peut pas jouer des fichier avi, au lieu je télécharge un fichier mp4...
Something doesn't work with this file, perhaps the site can't play avi's. Instead I upload an mp4.
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Re: Simulation non linéaire avec matériau élasto-plastique
Bonjour Laurent,
Je n'ai pas lu tous les réponses ci-dessous, mais je vois deux choses:
1. Les chiffres pour déformation plastique et contrainte dans le table en Creo ne concerne que le deformation plastique.
2. Les chiffres pour deformation n'est pas en "%" (je crois). C'est a dire, si la limite d'elasticite est à 235 MPa, et la résistance maximale est 530 MPa à un deformation de 30%, table sera comme suit:
235 0
530 0.3
Je lis maintenant dans les documents d'assistance PTC, et ce n'est pas tout a fait clair quel est l'unité pour deformation, mais je suis 99% sure c'est pas en %.
Si ton materiau est trop mou ("3" au lieu de "0.03"), tu aurais peut-être un problème avec la convergence.
(Je vois maintenant il ya un problème avec les dates dans ce forum. Le "post" (je connais pas le mot en fr.) original est daté "2015 sep 02", les reponses sont datées plus tôt.)
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Re: Simulation non linéaire avec matériau élasto-plastique
Mats,
Oui, j'avais remarqué ce problème de date avec mes réponses, donc je ne sais pas si Laurent est toujours sur le sujet.
(en français correct la traduction de "post" ou "topic" est "sujet" ou "fil de discussion") mais on utilise aussi post dans le français.
Mais ne vous faite pas de souci, votre français est excellant, si seulement je pouvais en faire la moitié en anglais.
Cordialement.
Denis
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How to fix an invalidated key frame sequence in Creo Parametric animation?
I created several snapshots to make an animation with in Creo Parametric. I created the key frame sequence, but when I try to play the animation I keep getting the following error "Key frame sequence Kfs1 invalidated and will be ignored." What does this mean? How did I get an invalidated key frame sequence and how can I correct it? Has anyone had this problem before? I am not sure where to start because I did the process exactly as I have before, and it worked previously.
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Re: Plasticity and fasteners
Mats, (& forum)
I looked at your model and you have done as I have done which was to resort to the ancient art of preloading by 'shrinking' using a temperature load.
This avoids preloads which are disallowed when considering large deformation and therefore elasto-plastic materials.
I have the additional complexity of an initial interference.
I have attached a model to illustrate this.
This model will run if large deformations are not used. Analysis1.
The model will fail if large deformations are switched on. Analysis2.
The full interference is entirely resolved in the time=0 step causing the large deformation solver to fail. I cannot gradually introduce the interference.
Possible errors/causes reported in the logs:
- To close to or beyond a buckling mode
- Loads may be too high and thus mesh should be refined, reduce the load a inspect the deformed shape
- Static instability
- Exceeded the material limits
The model is constrained ok. It's unlikely to be unstable or buckle.
Material limits are not applicable as linear properties are assumed at this stage.
So load/mesh combination is not good and I am guessing that this will be at the 'L' shaped contact. I would also further guess that I would need rounds on the 'L' to begin to make this work. The fastener also has corners at it's change of section between head and shank As mentioned above I cannot step the load when there is an interference so I am left with mesh as the only thing to play with.
As a result I cannot begin introduce non-linear materials. (there is a volume region with suppressed non-linear material property applied). Analysis3.
I chose the location for the volume region where there is no possibility of the material becoming plastic or material limits being exceeded.
None of the above considers friction (although I have infinite friction applied under one end of the fastener so I do not have to make springs) and I am not worried about mesh quality or whether the numbers for the fastener are sensible at this stage.
bfn
Charles
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Re: Plasticity and fasteners
I have a work around for the interference.
The parts need to be offset so that there is no interference at all.
I now need to understand how to adapt the preload calc as this means the fastener is initially tightening on a gap
This means I can use plasticity with a preloaded structure that has initial interferences.
It a right faff though and I can imagine arrangements of components where this method won't work
So much better if preloads/initial interferences can be made to work with large deformations and/or being able to sub model.
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Re: How to fix an invalidated key frame sequence in Creo Parametric animation?
Setting all the bodies to desired resolved the issue. Don't know why the bodies can't be unspecified or required on this animation though.
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Re: Creo Simulate and Windows 10
Upgraded a laptop to windows 10 with Creo preinstalled. Had to reload drivers for video, mouse & keyboard and a few other drivers.
Once this was done lost scroll zoom but the following link fixed that issue.
How to make scroll wheel zoom work in Windows 10 with Creo Parametric
Now things seem to be working ok.
Don Anderson
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Re: Transient Thermal Conduction - Creo Simulate
One problem is this: Block 2 will NEVER get to 170 degrees. It will only get to a temperature between 170 and 20, and that temperature will depend on the ratio of mass*specific-heat of the two blocks. So if you are trying to find a solution to the problem of T2 where T2 is defined as when block 2 becomes 170 degrees, you will be waiting a very long time.....
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Solver automatic load factor reduction
Hi All,
When carrying out a large deformation study with contacts, load factor steps are crucial to success.
The warning that one can get in the .pas file :
** Warning:
Large displacements detected at one or more contac regions.
This can be caused by a very flexible model or disconnected
volumes or components. Temporarary overriding load factor with: 0.1
Which seems fair enough except my original load factor was 0.001.
The question is :
Has the solver replaced my 0.001 load factor by a much larger load factor 0.1; in which case it won't work
OR
Is it multiplying mine by 0.1 making the load factor being applied 0.0001 (which seems a bit too fine) ??
I have raised a support call but it seems my model is required to answer the question. I can't send my model but I have promised to build another to demo this but pushed for time.
Very frustrating.
Any thoughts?
Thanks
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Simulation non linéaire avec matériau élasto-plastique
Bonjour à tous !
Je suis nouveau sur le forum, mais pas nouveau à utiliser les produits PTC car je l'utilise depuis 2007 (licence professionnelle), et plus particulièrement depuis 2008 dans mon entreprise. Je travail au sein d'un bureau d'étude qui conçoit des connecteurs électrique pour le monde entier. Je suis le référent "calcul - simulation", et j'ai besoin de votre aide sur un cas nouveau pour moi. Je précise que l'on travail avec Creo 2, et donc Creo simulate. Avant de poster ici, je suis aller voir la formation en ligne "introduction à simulate", mais cette formation ne traite pas de mon problème.
Je souhaite réaliser une étude sur un corps en plastique, dont le comportement à la charge n'est donc pas linéaire.
Pour simplifier le calcul, je suis parti d'une "éprouvette" à la forme simple (une barre à base rectangulaire) et qui ne comporte que 39 éléments finis. Je la bloque sur sa base, et j'applique une force sur son extrémité.
Tout d'abord, j'ai essayer de créer la bonne matière. Voici la courbe contrainte/allongement que j'ai récupérer d'un essai labo et que je souhaite utiliser dans ma simulation :
Et voici les paramètres que j'ai rentrer dans la création de ma matière :
Est ce que je me suis trompé quelque part ? Dans les unités ? Dans les valeurs rentrées dans ma courbe ? Est ce que j'ai oublier de cocher une option ?
Maintenant, concernant l'étude à proprement parlé, voici les paramètres rentrés :
Quel est votre avis sur ces paramètres ? J'ai encore oublié quelque chose ?
Merci pour votre retour d'information et votre aide bien précieuse !!!
Laurent.
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Re: Solver automatic load factor reduction
In Creo2 the solver shows what the new load factor is:
| Load Factor: | 0.00125 |
| Iteration | Residual norm | contact Area |
------------- ------------- ---------------
| 1 2.52932e-009 243.333 | Tue Oct 27, 2015 11:06:40 | |
| 2 1.98708e-009 243.333 | Tue Oct 27, 2015 11:06:52 | |
| 3 2.23639e-009 243.353 | Tue Oct 27, 2015 11:07:06 | |
| 4 4.66306e-008 242.942 | Tue Oct 27, 2015 11:07:10 |
Excessive motion detected at contact regions. Cutting load step size
| Load Factor: | 0.001125 |
| Iteration | Residual norm | contact Area |
------------- ------------- ---------------
| 1 2.04585e-009 243.335 | Tue Oct 27, 2015 11:07:21 | |
| 2 1.61116e-009 243.335 | Tue Oct 27, 2015 11:07:33 | |
| 3 1.80889e-009 243.355 | Tue Oct 27, 2015 11:07:47 | |
| 4 4.10039e-008 242.944 | Tue Oct 27, 2015 11:07:51 |
Excessive motion detected at contact regions. Cutting load step size
| Load Factor: | 0.0010625 |
But maybe you are using a different Creo version?
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Re: Solver automatic load factor reduction
Hi Patrick,
Yes I agree, the load factor is reported in the pas file but I was hoping the reporting methodology had changed (or some other explanation) that I had failed to read in release notes or the help. Hence my post. I'm using Creo3.0 M030.
Below is extract from a model I let run just to see what would happen. I am convinced it's not working as it should!
There is still opportunity for it to be user error of course.
I will update my support call accordingly and let you know the result.
Begin Time Step 0 of 42: 0.00000e+00
Sun Oct 25, 2015 10:01:54
Begin Contact Pressure Calculations
Sun Oct 25, 2015 10:03:39
Begin Displacement and Stress Calculation
Sun Oct 25, 2015 10:03:39
Begin Reaction Calculation
Sun Oct 25, 2015 10:04:53
Begin Convergence Check Pass 1
Sun Oct 25, 2015 10:05:31
Begin Time Step 1 of 42: 1.00000e+00
Sun Oct 25, 2015 10:06:39
** Warning:
Large displacements detected at one or more contac regions.
This can be caused by a very flexible model or disconnected
volumes or components. Temporarary overriding load factor with: 0.1
Iteration Residual norm contact Area
------------- ------------- ---------------
1 103.536 37222.7 Sun Oct 25, 2015 10:29:11
2 0.100549 37621.7 Sun Oct 25, 2015 10:45:06
3 1 31000.2 Sun Oct 25, 2015 10:53:12
4 0.000736543 25505.7 Sun Oct 25, 2015 11:01:14
5 7.7893e-007 14855.3 Sun Oct 25, 2015 11:09:26
reset load factor to: 1
6 0.00337315 27654.7 Sun Oct 25, 2015 11:22:19
7 0.297397 18784.5 Sun Oct 25, 2015 11:32:20
8 0.147715 18801.1 Sun Oct 25, 2015 12:07:59
9 1 29247.3 Sun Oct 25, 2015 12:19:12
10 0.0107504 31755.9 Sun Oct 25, 2015 12:28:57
11 0.333253 18310.7 Sun Oct 25, 2015 12:46:38
** Warning:
Excessive motion detected at contact regions.
Cutting load step size.
Load Factor: 0.5
Iteration Residual norm contact Area
------------- ------------- ---------------
1 0.0614236 31622.2 Sun Oct 25, 2015 12:59:20
2 1 26811.3 Sun Oct 25, 2015 13:04:53
3 87406.7 25715.7 Sun Oct 25, 2015 13:15:24
4 444.189 25715.7 Sun Oct 25, 2015 13:15:40
Load Factor: 0.25
Iteration Residual norm contact Area
------------- ------------- ---------------
1 0.0138464 21575.8 Sun Oct 25, 2015 14:50:05
2 1 16727.6 Sun Oct 25, 2015 14:55:27
3 48.2272 20434.3 Sun Oct 25, 2015 15:06:00
4 1 20434.3 Sun Oct 25, 2015 15:06:15
Load Factor: 0.125
Iteration Residual norm contact Area
------------- ------------- ---------------
1 0.00105901 33570.6 Sun Oct 25, 2015 16:58:26
2 1 10514.1 Sun Oct 25, 2015 17:03:16
3 1.87402 16070.9 Sun Oct 25, 2015 17:14:09
** Warning:
Excessive motion detected at contact regions.
Cutting load step size.
Load Factor: 0.0625
Iteration Residual norm contact Area
------------- ------------- ---------------
1 0.0048524 10264.1 Sun Oct 25, 2015 17:28:02
2 1 10148.1 Sun Oct 25, 2015 17:37:56
3 0.0289352 8962.77 Sun Oct 25, 2015 17:47:13
4 1 7921.68 Sun Oct 25, 2015 17:53:55
5 1 7921.68 Sun Oct 25, 2015 17:54:25
***Looser residual tolerance accepted because area and force
converged for all contacts
Load Factor: 0.125
Load Factor: 0.09375
Load Factor: 0.078125
Load Factor: 0.0703125
Load Factor: 0.0664063
Load Factor: 0.0644531
Load Factor: 0.0634766
*** A fatal error has occurred. ***
The nonlinear iteration did not converge for the
time value: 6.34766e-02
o The model may have a buckling mode with a load factor
smaller than this value. You may determine the smallest
(linear) buckling load factor by running a buckling
analysis.
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Re: Solver automatic load factor reduction
Okay I didn't realise you were using a load function.
Have you tried to play in the Static Analysis Definition in the Output tab, using output steps?
You can create user-defined step sizes. That works okay for me, and it probably does away with the need for the load function definition.
(Of course it would still be interesting to see if you have run into a bug, but at least you have a workaround).
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Re: Simulation Results - copy clean image to clipboard enhancement request
Now posted as a product idea - Please vote for it!
Simulation Results - copy clean image to clipboard enhancement request
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