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This video shows how to write and implement a simple user material in ABAQUS. I hope it helps.

Hi all,

I have a problem with perfect-plasticity material model in Abaqus. I this simple 2D analysis, I am modeling a beam fixed at both ends and applying temperature loading on it that will cause yielding. The material model is perfectly plastic with,

*PLASTIC

4.85 E8, 0.0

The problem is, stresses go beyond yield limit (4.85 E8) which should not be the case for the perfectly-plastic material model. I would appreciate any comment/help/suggestion.

Regards,

Soner

Graduate Research Assistant Positions

Hi everyone:

I am wondering how to combine my fortran code with LS DYNA K file. Can I directly link them to K file or should I use format of DYNA21.f? 

Thanks

i am still struggling with  defining an initial condition in vumat. i have defined mine like this:

STATEV(1:nstatev)=stateOld(KM,1:nstatev) 

          if (steptime .eq. zero) then

          STATEV(1) = 1.0d0

            STATEV(2) = 1.0d0

            STATEV(3) = 1.0d0

            STATEV(4) = 0.0d0

            STATEV(5) = 0.0d0

I'm using a damage evolution model in XFEM in order to model crack growth, however I am trying to identify the correct Mode I fracture energy for my problem. In particular there seems to be an issue with the units of fracture energy in ABAQUS.

I am using Damage for Traction Separation Laws, Maxps; Damage Evolution Type = Energy; Mixed bode behaviour = Power Law with power value 1; Now at the bottom what should be the input values of Normal Mode Fracture Energy, Shear Mode Fracture Energy 1st direction and Shear Mode Fracture Energy 2nd Direction.

Hi

I am studying the mechanical response (behavior) of an FGM ( Functionally Graded Material )material that has a varying properties in the x direction according to the following Young's modulus formula 

   E(x)=E0*exp(ß*x)  for: 0<x<L

with: ß the non-homogeneity parameter of the material