Hello Abaqus users,
My model and elastic model which is divided into 10 steps, i checked the results, i found something strange. from step #1 to step#4 every thing looks good, i.e., the number of increments shown in the job module>> monitor are the same as that shown in the viewer. for step #5...
Hello
I need to know what is the difference between modeling a material for instance concrete as elastic-plastic with strain softening and model the same material (concrete) using damage plasticity approach.
Although In elastic-plastic with strain softening, the post peak failure is included...
Hello
I am working on a material whose stress strain curve is strain hardening (concave upward), unlike the steel whose strain harening is concave downward.
the problem is when i calculate the equivalent plastic strain, it is negative. the following table represents the true stress-strain...
Hello
For Elastic-perfect plastic material or strain softening material, I notice that if i apply load more than the yield limit, the model diverges, while when i apply load through displacement control, the model converges, although the displacement is big.
So my question is why load control...
Hello everyone,
I wish someone help me to understand how to apply the softening behavior of rock in Mohr-coulomb.
I know the friction angle and cohesion of the rock sample from the shear test. Moreover, i have the stress-strain curve for the rock (Uniaxial compression test).
the rock sample...
Hello everyone,
I have three viewports in ABAQUS viewer, i need to compare them.
The problem is:
the same color has different range of values for different viewports, for instance in the first viewport, the red color represents a stress ranges from 1000-1100, while in the second viewport, the...
Hello there,
I have used a simple model to understand sub-modeling technique, but i failed, and i need your help.
The model is 3D model (block). A uniform distributed load was applied on the top surface of the block, the bottom surface of the block is fixed in all directions, while the edges...
Hello there,
I am modelling an underground mine, I remove some elements to simulate excavations. After removing these elements, I have pillars (similar to columns in surface buildings), these pillars support the overburden rocks. the rock layer underneath the pillars is called the floor, while...
Hello,
To define the hardening or softening of a material using Mohr-Coulomb criterion, i need to define the variation of cohesion yield stress with Abs. plastic strain.
The question is, how can i define the variation of the cohesion yield stress with plastic strain? I know that, i can find...
Hello everyone,
I want to use Mohr-Coloumb criterion in the material property definition. I am confused about how to define the cohesion ( Cohesion yield stress & Absolute plastic strain).
My first question is, This cohesion is the shear strength at zero normal stress? In other words, is it...
Hello everyone,
I am working on Windows-7 and i have ABAQUS 6.12. I need to write a subroutine using a FORTRAN.
My question is, What fortran compiler is suitable for my windows-7 and ABAQUS 6.12.
The second question is, is it free or not? If it is free, please advice me how to get it.
Thanks
Hello everyone,
I am simulating an underground mine. The mine is similar to surface structure (building), it has columns and roof.
I need to use Abaqus to simulate the mine, but i have a problem with the material properties, Both the ultimate strength and behavior of the stress-strain diagram...
Hello everyone
I know how to change the material properties at specified time step from Mat-1 to Mat-2 if both of them are elastic. I can use the field variable to perform that task
*Elastic, depe=1
E1,Neo1, , 1
E2, Neo2, ,2
** E1 and Neo1 will be assigned for the first Material, while E2...
Hello there,
I got two warning messages, could anybody explain them to me, and whether or not they will affect the results.
first warning message:-
DEGREE OF FREEDOM 1 IS NOT ACTIVE ON NODE 3 INSTANCE solid-1, THIS BOUNDARY CONDITION IS IGNORED
My model is 3d, the element is C3D8R, i have...
I am modelling an underground mine (depth =400 m). the model is three dimensional. the dimensions of the model are 250 *250 *250 m. a vertical load was applied on the top of the model to simulate the overburden rock, the bottom is fixed, and the edges are constrained in the X and Y directions...
Hello there,
I have a problem in my model, it gives my un-realistic answer for the displacement.
the model is a three dimensional model, the first step is geostatic step. in the second step, I make an excavation (delete elements), the displacement from the model result after making the...
Hello
My model crashes at step4, increment 11. The total number of steps in that model are 12 steps. So i need to restart the model again from Step4, not from the beginning.
When i opened the Abaqus/CAE, i got a message about recovering the changes, i let the software recovers these changes...
I am wondering, Does anybody uses abaqus to simulate Longwall mining before.
A Longwall Mining is a method to extract underground coal slice by slice. The upper strata are forced to move downward and fill the voids left by the extracted coal.
Hello There,
I read this paper, it shows that the plugin tool in abaqus is very effective in changing the material properties during time steps. But i did not find the plugin window where you can define the initial and final properties of the material.
The title of the paper is "Plugin for...
Hell,
I want to change the material properties in my model at the third step.I know that i can use either USDFLD subroutine or *Field keyword option. Since i am not familiar with the USDFLD subroutine i chose the * field keyword. That is what i did
*Material, name=Material-1
*Elastic...
