Hello there,

Im a 4th year Aero-Mechanical Engineering student doing my thesis on valve dynamics. I need to model the elastomer as hyperelastic material as opposed to assuming linear elastic which is a poor approximation. Im using LS-DYNA 14.0 and I need to know how I can enter the Mooney-Rivlin Constants. I have the Excel Sheet from Experiments only. A uniaxial Tension/ Biaxial Tension and a PLANER tension(pure shear). I have only those data the strain values and the stress values for each of the tests. I do not have any other information regarding the experiment as a PhD student carried this out and I was only given the stress/strain values on excel to put into ls-dyna as hyperelastic modelling. I have looked numerous times into online and cant find how to enter the constants or a method of means to modelling the polyurethane. If someone could help me that would be great it would be really appreciated as this thesis is due a month today.

Regards

Ahmet Erik