Gamal's blog

Hi my friends,

I want to export both the stresses and the co-ordinates (x,y,z) at the
integration points using Abaqus CAE. I know how to get the stresses at the nodes
(unique nodal ) by using Visulaization module then report then unique nodal. But
when i try to report the stresses at the integration points, i did not find the
co-ordinates at the integration points as one of the output. I find only the
unique nodal.

Thanks alot,
Gamal

Hi my friends,

i am using Abaqus 6.6, i want to apply a load on rock sample, this load increases with increasing time, for example, the first minute the magnitude of load is 100 Psi, and the second minute 200 psi, and the third minute 300 psi, and so on.

how can i do this?

thanks alot

Gamal

Hi my friends,i am using Dracker prager plasticity model to simulate uniaxial compression (softening) of coal samples.in dracker prager, the shear criterion is linear, and the hardening type is compression. there is a table that i should fill out, this table composed of yield stress and abs. plastic stain. my question is:- how can i fill out this table by using the experimental data (stress-strain diagram for uniaxial compression test) ?? shall i convert these data using any equations??

Hi my friends,

in Mohr-coloumb plasticity model in abaqus program, there is hardening table,this table includes both cohesion yield stress and absolute plastic strain.

the question is this cohesion yield stress is calculated from the stress -strain diagram, or this cohesion is estimated from the shear test, you know when you draw a relationship between shear stress and normal stress you can get both cohesion and friction angle.

the second question is :- how can i see the model while it is running, i am using abaqus 6.6.

thanks alot.

Gamal

hi my friends,

could you please tell me step by step how can i :-

1- define rigid body

2- make contact between rigid  and deformable body

thanks alot

best regards,

Gamal

can i use the equivalent plastic strain to evalute the state of the elements (yield or elastic) when the i use Mohr-Coloumb plasticity (Abaqus 6.6).

 i am asking this question because i made a model to simulate  the uniaxial compression test using mohr-coloumb plasticity, but i find that the equivalent plastic strain remain constant at all elements, i am sure that the it should change from the edged of the sample to the core of the sample.

hi my friends, i am new in Abaqus, while i am making a uniaxial compression test for coal  sample using Abaqus 6.6, the failure criteria is Mohr-coloumb plasticity, i know that the behavior of coal is strain softening. i should use this table to simulate the hardening/softening behavior of material.

 cohesion  yield stress

 Absloute plastic strain

i know that the first row will be the yield stress and the zero plastic strain.

i am simulating a uniaxial test for coal specimen using Mohr-Coloumb plasticity, there is a friction between the coal sample and the platens, the coal behavior is stain sotening.

i want to know how many points should i use in the hardening table of the mohr-coloumb plasticiy to get a good reults?

 i used 3 points:- the first one is the yield stress and the associated plastic stain, the second one the peak stress and the associated plastic strain the third one is the post peak stress and the assoiacted plastic strain. is that right?