I have been able to reduce the oscillations of the VUMAT output by avoiding the *variable mass scaling, and by changing the *density value only. I wou...

I ran two simulations, one with umat, one with vumat for the same material model, with same boundary conditions. The results from the umat one showed ...

Re: vumat validation [quote=Jorgen_Bergstrom][imgp> [/quote] Dear Jorgen, Do you know why the stress-strain curves are not smooth for vumat 4x4x4 e...

Hi Jorgen, Thanks for your reply! Do you have any reference on the finite difference approach and on how to implement it in FE? To approximate th...

Hi All: Here is my 2 cents on the convergence issues: 1) As Stablguru mentioned, strain energy function needs to satisfy the ellipticity condition, ...

Hi Jorgen, One more question related to the UMAT code of Neo-Hookean materal model. Can the DDSDDE be the elasticity tensor in spatial description de...

Hi Jorgen, Thanks for the reply. You are right that for incompressible material S=2*((C10+C01*I1)*I-C01*C)+pC^(-1) ...