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1
Hello,

I am using an Azerty keyboard, with French language.

I’m starting with the tutorial get started « create a database » but when saving the new database with the selection “template Aerospace” I receive the message as shown in picture error.

When I look in the preference menu it looks not the same as in the training material (preferences picture)

The OS of the system is in French.
 
P.s. we checked if the Region and Language --> Additional settings could have an influence. But that did not have an influence
2
FEM Coupling (HyperFEA) / Re: Freezing FE Iteration at specific candidate
« Last post by Brent on April 16, 2018, 11:00:50 AM »
Hi Jan,

To help us better answer your question, we will contact you directly to get more information.

Thanks,

Brent
3
FEM Coupling (HyperFEA) / Re: ANSYS: Varying temperatures between load sets
« Last post by Brent on April 16, 2018, 10:38:10 AM »
Hi Jan,

You are correct in your assumption. Since HyperSizer cannot import temperatures from ANSYS, it does not know where to apply the temperature dependent material properties.

The work around we suggest is the following:

1. Import your thermal load sets as mechanical. (Skip this step if the thermal loads are already combined to mechanical loads in your FEM)
2. Assign a unique reference temperature to each "Thermal" load set.
3. Assign a different material to each part of the structure that would have a constant applied temperature.
4. Assign reference temperatures to each material system that is consistent with the "applied temperatures" of the "thermal" load set. 

EXAMPLE:
1. When sizing a single component for one load case, HyperSizer will use the temperature dependent properties associated with the reference temperature assigned to the load set.

2. For one "thermal" load case with multiple components that have different applied temperatures, the different material systems for these components will have different temperature dependent properties for the same reference temperature.

Careful attention must be used when managing the various temperature dependent properties and reference temperatures for each material system on each structural location. Supporting ANSYS temperature loads will be evaluated for future software releases. 

Question: Will you need to update the FEM with the temperature dependent properties unique to each thermal case? Or, will the room temperature properties for used in the FEA runs?

Hope this helps!

Brent 
 
4
FEM Coupling (HyperFEA) / ANSYS: Varying temperatures between load sets
« Last post by JanPio on April 16, 2018, 08:41:31 AM »
Hello,
we currently use HyperSizer 7.3.50 with ANSYS 18.2 to evaluate various designs of a Reusable Space Launch Vehicle with metallic materials.

First, our understanding of the thermal behavior when connecting HS to ANSYS: The help page on “Thermal Loads” says that “ANSYS thermal loads are not supported.” However, as HyperSizer only imports the resultant element forces from the ANSYS results file and BF-commands are also included in the newly created "*_i.cdb", thermal strains/stresses  seem to be considered. Therefore, the only relation HyperSizer cannot build up is which material property to use at which region of the structure, because the current temperature is not known. Is this right?

Now to our problem: Different parts of the structure, such as the tank or the wings, have different temperatures assigned in a wide range. Additionally, these temperatures should change for different load sets, such as liftoff or reentry. Thermal strains/stresses seem to be included in the results, but we cannot change the loads between load sets.

Workaround: For considering temp-dependent material properties in the parts of the structure we created separate materials for different temperatures, such as "Alu 20K" and "Alu 293K". But this obviously neglects temperature changes between load sets, because there is no possibility to change these materials between load sets.

Questions: Is our understanding of the use of temperatures in HS/ANSYS correct? Is there another workaround to include variable thermal setups in load sets?

Thank you in advance,
Jan
5
FEM Coupling (HyperFEA) / Freezing FE Iteration at specific candidate
« Last post by JanPio on April 16, 2018, 08:03:18 AM »
Hello,
we currently use HyperSizer 7.3.50 with ANSYS 18.2 in order to find the most promising design of various design concepts for a metallic fuselage-wing-connection. Our data structure is as follows:
  • Each design concept has a separate subfolder, containing the *.cdb, *.s01 (.s02,…) and *.rst files of the initial ANSYS run.
  • We have one single HyperSizer database *.hdb, in which each of the 20 design concepts is a separate HyperSizer “FEA Project”.
Problem: The iteration process with HyperFEA works in general, but we recently experienced some freezing FE iteration processes. Details:
  • The iteration stops at one specific candidate and does not continue for hours, so we stop it manually.
  • It occurs after several successful FE iteration steps, so not directly in the first one.
  • After aborting a frozen FE iteration step, we start the iteration process again and it gets stuck again. It always stops during “Running HyperSizer…” and at the exact same component and candidate.
  • There is no error message.
Workaround: Compacting the database sometimes helped repairing the files and those iterations finished successfully afterwards, but some still have the problem. We observed that changing step sizes in the Sizing Form helped: it did not get stuck anymore.
Question: What is the root of the stuck processes and how to solve it? Is HS encountering memory problems, maybe because of the many projects in the database?

Thank you in advance,
Jan
6
Scripting / Re: Linking ConceptVariable Within a Group Through COM
« Last post by August on April 11, 2018, 08:56:15 AM »
"Cross-sectional linking options" are not accessible through the API. Another route would be to specify this setting as a database default. Then the option will be active any time you create a new assembly.
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Scripting / Linking ConceptVariable Within a Group Through COM
« Last post by jcorman on April 02, 2018, 02:25:01 PM »
Is there a way to set up variable links for a specific concept within a group through the python scripting interface? There was a similar question in the forum regarding linking design variables across components of an assembly, but it didn't address the cross-sectional variables within a given component.

For example, I have a Z-Fastened concept that I want to link the top and bottom flange thicknesses to the web thickness. In the GUI Sizing Form, the option exists to right click on the variable for "Cross-sectional linking options" and we can select "Link stiffener flange and web thickness." I can't seem to find a workaround in the python API to do this in a programmatic way.

Using version 7.2.22 - could this option be exposed in later versions of HyperSizer?
8
Hi jsanc,

It looks like there are two things going on here.

Moment of intertia calc
First, since this is effectively a rectangle with width 2" and height 1", the moment of inertia about the centroid of the cross-section is 1/12*(2in)*(1in)^3 = 1/6 in^4. If you do use the parallel axis theorem with two 0.5" plates, the offset of each, y, should be 0.25", since this is the distance from the midplane of the section to the centroid of each plate. Of course these two values should come out the same.

Moments applied in HyperSizer
When we apply moments in HyperSizer, we do so using running load. That means that any moment you apply has units of "in*lb/in", not just "in*lb". In this case, Mx is defined in terms of in*lb of moment per inch of x-span. So your Mx for verifying the calculation should be (10000 in*lb/in)(2in)=20000 in*lb.

Feel free to respond if you need clarification on anything!
9
New to HyperSizer and trying to understand the various inputs with a simplified case before proceeding to more difficult geometry.

Component type: foam sandwich w/ 0.50" upper and lower panels. Thickness of foam core is set to be very small 0.0001". 2nd area moment is calculated by: (1/12 bh^3)*2 (b=2, h=.5"). Since the foam core is intentionally very small, the area moment reduces to 2/48 in^4 (or 0.042). [see attached calculation]

In the Free Body section, the panel is unconstrained with the total Mx load of 10,000 in-lbs. The panel dimensions (a=1", b=2") are entered, but do not appear to be related to the stress??

Calculating the average stress at the neutral axis of the top plate gives: 10,000 in-lb * 0.25" / (2/48 in^4)) = 60,000 psi.

Hypersizer is calculating a stress of ~30,000 psi.

My answer is 2x larger than Hypersizer. I thought that I should unitize the bending load, but this would only make the difference increase.

Help appreciated. Thanks.
10
The training videos get recorded every year, around spring time.
The most current training videos are available upon request:

https://hypersizer.com/support/training-videos/

At this time (2018-02-28) the videos are for HyperSizer v7.3.35

-James
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