Modelling with a Rubber component
Modelling with a Rubber component
(OP)
Hello Eng Tips.
I have a situation i'd like to model - it includes rubber as a cushion/ isolation between steel components. The application is a surface scraper: a blade connected to supporting steel via a rubber isolation cushion. I know the force at the blade, and want to check the supporting structure. The isolation cushion is a proprietary item (i'm not 'checking' that part of it), rather the supporting structure and the blade.
I'm having immense difficulty defining a hyperelastic material. I can find theory on the matter easily enough, but without performing my own testing, I cannot find any appropriate parameters for the material. The program I'm using can simulate the material, however i need a stress-strain/force-displacement curve for the material which i don't have (and cannot get).
Does any one have any stress-strain data resources (google isn't giving me much at all).
Anther related question: thought on if I assume that the cushion is a linear material (i.e. steel set to very low density) and use the simulation to . I'm not concerned with displacement of the blade, Would taking such an approach yield conservative results? Forgive the ignorance on this one please.
Thank you.
PS: Using either Strand 7 FEA or Nastran-in-CAD with Inventor.
I have a situation i'd like to model - it includes rubber as a cushion/ isolation between steel components. The application is a surface scraper: a blade connected to supporting steel via a rubber isolation cushion. I know the force at the blade, and want to check the supporting structure. The isolation cushion is a proprietary item (i'm not 'checking' that part of it), rather the supporting structure and the blade.
I'm having immense difficulty defining a hyperelastic material. I can find theory on the matter easily enough, but without performing my own testing, I cannot find any appropriate parameters for the material. The program I'm using can simulate the material, however i need a stress-strain/force-displacement curve for the material which i don't have (and cannot get).
Does any one have any stress-strain data resources (google isn't giving me much at all).
Anther related question: thought on if I assume that the cushion is a linear material (i.e. steel set to very low density) and use the simulation to . I'm not concerned with displacement of the blade, Would taking such an approach yield conservative results? Forgive the ignorance on this one please.
Thank you.
PS: Using either Strand 7 FEA or Nastran-in-CAD with Inventor.





RE: Modelling with a Rubber component
Rick Fischer
Principal Engineer
Argonne National Laboratory
RE: Modelling with a Rubber component
It sounds like you are planning to bond the rubber to other parts in your assembly. This gets tricky, you should be talking to a rubber molding shop, one with experience in bonding (hint: usually best done in the mold using bonding primers suited for your metals).
RE: Modelling with a Rubber component
Thanks for the lead - can't find through a simple page 1 google search. If you have a link that'd be great.
RE: Modelling with a Rubber component
Rick Fischer
Principal Engineer
Argonne National Laboratory
RE: Modelling with a Rubber component
Rick Fischer
Principal Engineer
Argonne National Laboratory
RE: Modelling with a Rubber component
Hello there,
I was in the same situations for few months until few days ago I came across with the following website.
There is a lot of material, lot of plotted stress-strain diagram and the best of it you can download its data for free too! :)
https://www.campusplastics.com
Good diving :)
regards,
mark
RE: Modelling with a Rubber component
As isolation cushion is a proprietary item as you said, could you get Force/Displacement curves from the supplier/manufacturer for it? Then you can use a 6 DOF beam material (Beam element) with curves representing stiffness in all 6DOFs. This will let you evaluate your structure,
PS: I am writing this from experience of working in LS-Dyna environment. No idea about how to go about this with Strand 7 FEA or Nastran-in-CAD with Inventor
RE: Modelling with a Rubber component
i have requested and will keep you posted.
the text 'Rubber Springs Desing" by Goebel is most helpful too. I obtained a 1974 copy from my library.