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gfbotha, I was wrong about using the biaxial data. Although the simulation results were very close, the Mooney-Rivlin coefficients were vastly different. Two term Mooney-Rivlin results: +.8403/-.2067 MPa from test source; +.7857/-.1637 MPa DesignSTAR calculation from adding the...

gfbotha, I am using .4995 for Poisson's ratio. I have no source for that number. It was arbitrary. My material is Santoprene PTV 111-55, and I was unable to find the Poisson ratio. My application is a gasket, some flat and some with features similar to a "D" shaped O-ring. I figure the...

gfbotha, I added the compression data to the front of the uniaxial data and deleted the biaxial input as you suggested. The results were the same as my using compression data as biaxial data. Even thou they gave the same results, I like your way better and will use it from now on. It may...

gfbotha, I'm new to nonlinear analysis, so I may be wrong, but doesn't the hydrostatic pressure compression equal zero with incompressible materials? The shape of a biaxial curve, which starts off similar to the uniaxial curve, is different than that of a uniaxial compression curve which...

Thanks gfbotha. I got it to work now. I was not adding the one to get stretch ratio. Stupidly assumed it was the same as engineering strain. Also found I had to not have input any Mooney-Rivlin coefficients. Using the simple compression data as biaxial tension works fine if input as...

How do I use a "simple tension" table for hyperelastic material instead of the Mooney Rivlin constants. DesignSTAR seems to use only the Mooney Rivlin constants instead of calculating based on the simple tension table I generate. DesignSTAR seems to delete the "use table" check mark. I only...