topic Re: Multibody Part material use in relations in 3D Part & Assembly Design

Multibody Part material use in relations

LH_10601291 — Thu, 18 Dec 2025 07:58:03 GMT

Hi everyone,

I have created a part with two bodies and assigned a material to each of them. Now I want to control the material or its density for one body using a parameter in the relationship.

Is this even possible? And if so, how? Or can I only control the overall density?

I use Creo 8.0

Re: Multibody Part material use in relations

KenFarley — Thu, 18 Dec 2025 12:03:01 GMT

Maybe you should try searching for Creo Multibody Materials or something like that. If you did, you'd probably find something like this:

https://support.ptc.com/help/creo/creo_pma/r12/usascii/index.html#page/model-based_definition/to_assign_a_material_to_a_body.html

Re: Multibody Part material use in relations

MikeBennett — Tue, 30 Dec 2025 18:49:57 GMT

Hi @KenFarley ,

I don't think this addresses the question, which is how to control the material or its density via a relation.

@LH_10601291 ,

The density parameter for a material is PTC_MASS_DENSITY. you can use this in relations as PTC_MASS_DENSITY:MTRL_## where ## is the feature id of that material in the model. I believe using a relation to set the density will affect only the use of the material in the model where it is set and will not change the default values assigned in the material library.

In the Relations window, you can view the local parameters and right click on your desired parameter > Insert to Relations to add it into the Relations field above and it will automatically add the :MTRL_## needed.

Re: Multibody Part material use in relations

LH_10601291 — Wed, 07 Jan 2026 12:55:55 GMT

Hi @MikeBennett

thank you for your hint. That is what I wanted and it solves my problem.