Drucker Stability

Hi,

i want calibrate a hyperelastic rubber in abaqus, i have experimental data and i want use Mooney rivlin and Yeoh.
But, also, i want check Drucker Stability?

can i do it?????
is there a internal tool in abaqus or i must create a subroutine, and in this case how?

thanks a lot

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Or try imechanica.org

For an intro to subroutines get the file
[url] http://imechanica.org/files/Writing [/url] User Subroutines with ABAQUS.pdf

Good luck

Frank