dependencies - Abaqus strain depedent damping and stiffness -

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i want model equivalent linear soil meterial in abaqus, has strain dependent stiffness , damping. damping due stead state analysis, better of type structural.

how can implement dependency of stiffness , damping on strain?

  1. with umat?
  2. with dependencies? (but suppose not solution dependent)
  3. other suggestions?

however, not know if although implemented if can run steady state analysis. if has example of soultion dependent material properties great help.

i posting answer external link: http://www-h.eng.cam.ac.uk/help/programs/fe/abaqus/faq68/abaqusf11.html

*"in material properties under keyword *material elastic specify range of values of e , corresponding shear strain values in ascending order. here use deviatoric shear strain values field variable 1. *material, name=sheardepend elastic, dependencies=1 1.2e5, 0.3, , 0.0001 1.5e5, 0.3, , 0.0010 2.0e5, 0.3, , 0.002 dependencies parameter specifies how many field variables being used. example 1. note omitted value temperature. using user subroutine field specify field variable value calculated deviatoric shear strain value."

from abaqus manual:

dependencies parameter applies abaqus/explicit analyses when alpha=tabular and/or beta=tabular.

so can done directly (without umat) shear modulus (g function of e). difficult part damping. abaqus allows rayleigh damping , explicit analysis dependent damping.


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