For your problem, Structural material properties must be input as isotropic elastic linear. Young's modulus (EX) and Poisson’s ratio (PRXY or NUXY) must be input as constant materials. Poisson's ratio defaults to 0.3 and should not be equal to or greater than 0.5. you have to choose Drucker-Prager (DP) in non-linear, inelastic, non-metal plasticity models.
The input data consists of three constants:
the cohesion value (must be > 0)
the angle of internal friction
the dilatancy angle.
The amount of dilatancy (the increase in material volume due to yielding) can be controlled with the dilatancy angle. If the dilatancy angle is equal to the friction angle, the flow rule is associative. If the dilatancy angle is zero (or less than the friction angle), there is no (or less of an) increase in material volume when yielding and the flow rule is non-associated.
The behaviour of soil is elastic until the stress level recive to a limit.
پیشنهاد می کنم از نرم افزار آباکوس استفاده کنید....چون این نرم افزار یک بخش مخصوص برای شبیه سازی خاک و اعمال پارامترهای لازم خاک رو داره... البته انسیس هم قابلیت آنالیز داره ولی یکمی مشکل تر هستش
For your problem, Structural material properties must be input as isotropic elastic linear. Young's modulus (EX) and Poisson’s ratio (PRXY or NUXY) must be input as constant materials. Poisson's ratio defaults to 0.3 and should not be equal to or greater than 0.5. you have to choose Drucker-Prager (DP) in non-linear, inelastic, non-metal plasticity models.
The input data consists of three constants:
the cohesion value (must be > 0)
the angle of internal friction
the dilatancy angle.
The amount of dilatancy (the increase in material volume due to yielding) can be controlled with the dilatancy angle. If the dilatancy angle is equal to the friction angle, the flow rule is associative. If the dilatancy angle is zero (or less than the friction angle), there is no (or less of an) increase in material volume when yielding and the flow rule is non-associated.
The behaviour of soil is elastic until the stress level recive to a limit.
Your best place to start is the help file, where there is a huge amount of information to answer your questions. ANSYS uses the Drucker-Prager model with an approximation to the Mohr-Coulomb plasticity model but maintains the use of Cohesion and Dilatancy angle for the porous media. See the Structural Guide>Chapter 8. Nonlinear Structural Analysis and search for soil as a start. If you've only done structural, soil is a completely different animal altogether...
FINALLY IN THIS PAPER YOU CAN FIND MORE....
http://elearning.just.edu.jo/jjce/issues/paper.php?p=2337.pdf
Mr Maziar :
I know that ABAQUS software has the ability of simulating soil very well.
But my goal is linking ANSYS to mathematical software MATLAB, and I do not know how to link ABAQUS to MATLAB.
That's why I used the finite element analysis software ANSYS.
I dont know actually what you are looking for in your investigation but it depends on the case and the exact calculation that you need. The type of elements vary for 2D or 3D evaluation, the nodes and..... So If you want to know about that it is better to look at ANSYS help and read the different type of elements and decide which one is more suitable for your investigation.
Regards
Dear Faramarz, I have got the same problem and some interrogates, did you succeed in modelling? how did you do with the water? did you use CDX?
I have been reading a little about this topic, and you can use Ansys CPT elements in APDL interface. These elements are specific for this type of problem, and those that use the Biot's equation.
Your question is so general. You should tell us about the modeling dimension, and the precision depended on the number of nodes that you are looking for.
the link which is given by Maziar Feizolahzadeh is not finding Drucker prager any where if I am not mistaken.
does anybody know how to model different types of soil in explicit dynamics ?
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