Learning Forum

[Ben_Ben]

Hey, 

I'm trying to inflate a balloon in Workbench LS-Dyna. 

When I use the Rubber 1 material (As seen below) given in Engineering Data Sources the model runs without any errors. It is a third order Ogden material. 

 

But I want to run the model with values from a paper I am referencing. The material properties are seen below.  This is also a third order Ogden material. 

But when I change the coefficients to the ones in the table above I get an error. 

Error MAT 2 is not found. Am I inputting the coefficients incorrectly?

If anyone could help me I'd be very grateful. 

Thanks, 

Ben

[Ram Gopisetti]

Hi Hyperelastic material models are not supported, our recent version include Blatz-Ko and Simplified Rubber and especially the ogden model is not natively supported, you may want to use the command snippets for the inputting the material card scoped to a body and the material is MAT_077o with additnial viscoelastic terms defined. 

Cheers, Ram 

[Ben_Ben]

Hi Ram,

 

I am a little confused by your reply. When I run with the material Rubber 1 from Engineering Data Sources the simulation completes with no errors. 

Rubber 1 is a third order ogden model. 

So why does the simulation not run when I change the parameters of the ogden model?

 

Thanks, 

Ben

[Reno Genest]

Hello Ben,

 

Have you tried using the *MAT_OGDEN_RUBBER from the LSDYNA External Model - MAT in Engineering Data? 

Also, Ansys 2022R2 is now available and now supports all cards for the  above keyword. So, I recommend you download and install the latest version:

https://download.ansys.com/Current%20Release

https://support.ansys.com/Components/DownloadFile?file=/WhatsNew/2022R2/2022R2-Mechanical.pdf

 

Reno.

[Reno Genest]

Hello Ben,

 

Here is the image:

 

Reno.

[Ben_Ben]

Oh thank you for your reply. I haven't tried that. Can try later today. Will also download R2.