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A
AndreaM1-Visitor
1-Visitor
May 28, 2021
Solved

NEW MATERIAL PROPERTY (V/MM) NOT PRESENT IN THE UNITS DROP DOWN LIST

  • May 28, 2021
  • 2 replies
  • 4330 views

I am using Creo Parametric - Release 7.0 (connected) 7.0 7.0.1.0

I would like to add a material property called DIELECTRIC BREACKDOWN VOLTAGE, units are [kV/mm].
When I add this feature to MATERIAL USER DEFINED features tab, I cannot select this unirs from the drop down list because it is not present.
Is there a way to add a few units to that list?

Best answer by KenFarley

I took a cursory attempt at a units.pro file, just containing the volt,kV,V,mV units to add. I copied the units.sup and followed the formatting and syntax it uses.

The end result was: no change. The voltage unit additions don't show up. Either I botched something up, or the units.pro file is not something Creo is loading at startup. I didn't mess about with the units.sup file.

2 replies

A
AndreaM1-VisitorAuthor
1-Visitor
May 28, 2021

I'm attaching here the tab/list I'm referring to.

 

Thank you!

KenFarley
KenFarley21-Topaz II
21-Topaz II
May 28, 2021

If you want to define a new unit of measure you need to do the following (Creo 4):

Execute the menu picks

File -> Prepare -> Model Properties
Units -> Change
Units -> New...

This brings up the units definition dialog. Select “Derived” from the Physical Dimension list, and enter the definition of your unit of measure. The "Numerical Unit Expression" must be a combination of known units, as Creo will only accept units of measure that it “knows”. For example, “m^2” is not the same as “M^2”, etc. Once the new unit definition is done, it can be assigned to parameters. Hopefully "kV" is a known unit of measure for your particular case, you'll have to check and might find it is something like "kilovolt" or "kVolt", etc.

    A
    AndreaM1-VisitorAuthor
    1-Visitor
    May 28, 2021

    Thank you for your explanation.

    I have followed it and tried, but it seems CREO 7 does not recognise V, or any other potential name.

    I tried to define it (see attached new_unit_2.png) but there is no way to do that because it does not recognise Ampere either (see attached new_unit_1.png).

    Following the instructions below:

    File -> Prepare -> Model Properties

    Units -> Change

    System of Units -> Info

    a text file appears listing (I think) all/most of the units recognised. Unfortunately, I cannot see any reference to Volts, Amperes, Ohm, etx., so, it seems it will not allow me to add an electrical-related units.

    Is that possible?

     

     

    KenFarley
    KenFarley21-Topaz II
    21-Topaz II
    May 28, 2021

    I don't know if anyone else has an idea, but it seems that there isn't any way to define electrical units. There's a Watt in the standard units, but not enough standard units to define a Volt. Seems to be a bias towards thermal and physical units. Maybe a custom system of units would let you define your own "basic" units? I don't know - it's not something I've ever had to attack.

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