Re: Transient Thermal Conduction - Creo Simulate

November 4, 2015, 9:29 am

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Tim,

 

it seems you want to use Prescribed Temperature (20 degree) for the initial temperature.

However, it is a constraint and will stay constant all through the analysis, so the surface can never reach any temperature other than 20 degree.

The strange result may be somehow caused by analysis finding a steady state very soon, because the temperature doesn't change.

 

I don't know a strategy to define different temperatures for the initial moment and otherwise keep it unconstraint.

You can only set one global temperature.

Maybe it is somehow possible to heat up block 1 within the analysis and then stop heating and look at what happens, when it reached 170 degree?

 

Thanks,

 

Gunter

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Re: Mold Analysis Lite

November 4, 2015, 9:45 am

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Hello Douglas,

 

my understanding is that the license has to be purchased in the past (until 17-oct-2014) to be eligible for upgrade. When they purchased it afterwards, they don't get CMA for free.

And of course active maintenance is required - isn't it always?

 

Thanks,

 

Gunter

Re: Displacement is way too high

November 5, 2015, 8:24 am

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Thank you for the reply. I think the answer to your question is yes. That is, I am opening a design study with the part exactly as shown in my attached pictures and running the analysis.

 

Here is the .prt if you want to play with it.

Re: Displacement is way too high

November 5, 2015, 9:21 am

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Couldyoutellmewhatyouuse?

Theconversionof young'smodulusisnotgood.

Re: Displacement is way too high

November 5, 2015, 10:41 am

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Lucas,

 

SA-36 is steel, so change your E to 2.9e+07 psi.  I used IPS units.  But that should fix it, as you can see in the displacement plot below.

 

 

Re: Displacement is way too high

November 5, 2015, 11:17 am

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Thank you Steven! That was it. The lbm/(in sec^2) unit was pulled in from out material file. I'll have to get those corrected.

 

Now I'm curious if you think this is an adequate analysis of this part to give it a rating, or is a more involved analysis necessary?

Re: Displacement is way too high

November 5, 2015, 11:25 am

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Lucas,

 

I ran your model with 5% and 1% convergence in the regions of interest.  Remember, von Mises numbers are all positive in the legend, but I got about 30060 psi max in the lower and upper radii.  I only ran the model with the conditions you set up.  I don't know what the physical system really looks like.

 

Re: Displacement is way too high

November 5, 2015, 12:09 pm

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Steven,

 

Thanks again for your help. What I'm concerned about at this point is not the result of the analysis, but the method I've used to get there.

 

The top hole is hung on a hook hanging on a chain from a ceiling hoist. Is the displacement constraint I've placed on it a good representation of that scenario? I tried to remove the constraints in the X and Z direction, because nothing will be holding the hook in place in those directions, but the analysis fails every time I try it that way. It shows parts of the mesh in red and tells me my constraints are wrong. The same thing happens with a "pin" constraint on the top hole. I ended up with the constraint on the top hole the way it is just to make the analysis run without failing.

 

Also, is the bearing load correct? How exactly does creo define a "bearing load" and in what directions is it free to move/rotate? Is the gravity load set up correctly? As I said before, I just don't know what i'm doing with any level of confidence on this. I really need to take a class or something, but I don't see that happening.

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Re: Displacement is way too high

November 5, 2015, 1:57 pm

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Lucas,

 

Can you upload a picture of the physical system?  I don't know why you have a gravity load in the design study.  If this is just a hook, constrained at one end with a bearing load at the other end, then maybe that's all you will need.  Why did you apply the gravity load?  The bearing load is applied properly as far as bearing loads go.  Here's another image for fun with volume regions displayed.  I won't be back in my office until next Monday.  Try to provide a sketch or photo of the system you want to analyze with a description of the boundary conditions and loads.

 

Re: Displacement is way too high

November 5, 2015, 2:44 pm

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Steven ,

 

I thought the gravity load was to include the weight of the part itself. I knew it would not have a significant effect on the result in this case, but included it just to be thorough. Is that not the purpose of the gravity load tool?

 

I have requested the guys in the shop snap some pictures the next time they use this tool. I don't know when that will be, but I will update this thread as soon as I get them.

 

Until then , thank you very much for your help.

Re: Displacement is way too high

November 5, 2015, 6:05 pm

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Excellent.  Can you tell us what the three slotted hole are for?

Re: Displacement is way too high

November 5, 2015, 6:12 pm

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You can Review Total Load before processing to check the loads in your model.  Then you can check the resultant loads in the summary window in the post-processing phase.

Re: Displacement is way too high

November 6, 2015, 5:13 am

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The slotted holes are hand-holds for manipulating the position of the part hanging from the hook while it is suspended - that would be primarily rotating it and fine adjustments to set it down in the proper place on the floor/shelf. I don't think they would ever see more than 10 blf in any direction. Do you think it should be included in the analysis?

mass idealization in modal and shock analysis

November 6, 2015, 5:19 am

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Hello,

I am doing a shock analysis introducing as input a response spectre of a sismic event, function of frequency and acceleratio Se(T) [g].

The idealization of a chemical reactor with the heat exchanger welded above it, is a series of beam of different section.

I have to insert a series of mass idealization, for the mass located in the axis of the beam there aren't problem.

But I wont to intruduce a mass at a "X" distance from beam axis and I don't know how to join the mass to the beams.

I tried by rigid link or weighted link but a message says that the indipendent side element is has several point collinear.

Anyone know how to resolve this problem please?

Re: Atlas Stress Strain Curves

November 7, 2015, 10:35 am

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Hello

Thereisaverycomprehensivesiteonmaterials.

Itisfreefortesting,butafteritispaid.

Itwould becompatiblewithCreotoretrievethedataofcurveswhichwould beagreatadvantage.

Kind regards.

Denis

 

http://www.totalmateria.com/page.aspx?ID=Home&LN=FR

 

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Re: How to display reference plane or curve in mechanica analysis result?

November 8, 2015, 11:36 pm

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Your comment seems to work, but I have not wholely been aware of your idea. I need to exercise that for times.

Re: Simulation non linéaire avec matériau élasto-plastique

November 8, 2015, 11:50 pm

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Thanks a lot ! I think you have answerd to all my questions. Thanks to other guys, it's clear now !

 

Nevertheless, one week ago, I has a training on Ansys use (linear), and i will have the non linear training next year.

 

Best regards.

Thank you.

Re: In Optimization Design, how to select one part's parameters in assembly situation?

November 9, 2015, 12:28 am

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Sorry so late to reply you. I did not quite understand your proposal. How to operate it ?

Re: In Optimization Design, how to select one part's parameters in assembly situation?

November 9, 2015, 12:44 am

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For example, if you want to drive the part parameter WIDTH in an assembly optimization:

1. Create an assembly parameter PART_WIDTH
2. Create an assembly relation WIDTH:0 = PART_WIDTH  (if session ID of part is 0 - otherwise use the appropriate ID)
3. Select PART_WIDTH for the optimization

Gunter

Re: Displacement is way too high

November 9, 2015, 12:58 am

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What's the overall factor of safety?  My view would be that unless this is being designed right down to the limit (is it going into space? ) then minor additional loadcases such as that one can be absorbed into the safety factor, unless they're likely to trigger buckling or somesuch, which shouldn't be an issue as this is in tension.