Jump to content
RokHodnik

Material properties units Simlab

Recommended Posts

Hello!

One quick question.

 

When inputing units into materials manager in Simlab I often have problem with knowing in what units to input the property data.

 

For example is the unit for Density kg/m^3 or g/mm^3 or kg/dm^3 or kg/mm^3?

image.png.fccdc4d80016236a28645d217343308b.png

 

In tutorials people are usualy inputing data in XX units for example for steel 7.8e-9 units.

 

Steel has:

7650 kg/m^3

0.00765 g/mm^3

7.65 kg/dm^3

7.65 e-6  kg/mm^3

 

So what is the input unit?? I think it is kg/mm^3 but then tutorials input false data.

 

Specific density SI unit is kg/m^3.

 

Below is example from tutorial.

image.png.b8f640631a6741d87f90a08612c832e6.png

Share this post


Link to post
Share on other sites

Calculating Mass property confirms the 7.65e-6  kg/mm^3. Please confirm my statement.

The modeled structure sholud have cca. 200g of mass.

 

Input density in this case is 7.65e-6  kg/mm^3.

 

Still confused with tutorial input data and default input data in the box. As 7.8e-9 density is not used for any material why should it be default value...

image.png.f43a3e2582a869122a42ebdb3ea891aa.png

Share this post


Link to post
Share on other sites

7.89 e-9 for density is tonnes/mm3.So mass will be tonnes. Simlab is unit less,So please ensure unit consistency in the model.

Share this post


Link to post
Share on other sites

Thx for help @Rahul R.

I think Altair should consider adding unit labels next to the input boxes.

If there is no unit label user would expect SI units so you can easily get confused with critical parameters.

Share this post


Link to post
Share on other sites

HyperMesh 2019 does allow option of setting CAD import/export with target unit system.I believe Simlab too will have unit system support in near future. 

Unit system.png

Share this post


Link to post
Share on other sites

Dear Rok,

 

Altair SimLab does not have yet explicited units of measure, but this enhancement will happen very likely in the next release (SL 2019.2). 
Until then, please consider to adopt always consistent system of units. You can follow the guidelines I attach here.

 

Thank you

 

Units of Measures - Altair SimLab.pdf

Share this post


Link to post
Share on other sites
15 hours ago, Alessio Librandi said:

Dear Rok,

 

Altair SimLab does not have yet explicited units of measure, but this enhancement will happen very likely in the next release (SL 2019.2). 
Until then, please consider to adopt always consistent system of units. You can follow the guidelines I attach here.

 

Thank you

 

Units of Measures - Altair SimLab.pdfUnavailable

 

Attatchment unavailable.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
You are posting as a guest. If you have an account, please sign in.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...