I have 4 Question in implementation of Hypo-sand Umat in ABAQUS could someone kindly explain?
1. I checked the Umat file from (https://soilmodels.com/download/plaxis-umat-hypoplas-zip/) and i understand this subroutine needs 15 parameters that these parameters are listed in the first picture but when i searched in soilmodels.com and found one question from mr. Akshay Sakhare that modeled triaxial test in ABAQUS with Hypo-Sand
and he sent the parameters that he used in user material that you can see in the second picture that I attached in the following
what is the definition of 16th parameter
when I delete this parameter my abaqus send an error and the job terminated
2. if I want to impliment the basic hypo-sand wich parameters have to be equal zero? as you know Parameters of the intergranular strain concept for sandy soils are 9th-14th (listed in the first picture)
3. my third question is that why we use bulk modulus of water in the hypoplastic constitutive law?
is it for saturation conditions?
4. and when in was reading (https://web.natur.cuni.cz/uhigug/masin/plaxumat/node5.html) I found that we have 14 state variable and I entered the amount of Depvar equal 14 but in the UMAT file I cant find state v more than 13 (may be my mistake) (third picture)
is it correct that we should enter the Depvar equal 14?