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Hello everyone, I want to use ABAQUS for underground mine design. the top surface is highly variable, in other words, parts of the mine is overlain by mountain and others are overlain by valley), moreover it is very irregular. Hence, the vertical load will be different. My question is how how...

Hello Is there any idea about how to evaluate a violent failure using Abaqus? what kind of output requests would help to say that the failure is violent or not in Abaqus? I can not tell from stresses or strains. Thanks Chen

Hello everyone: Let me first tell you what is a violent failure of a coal (or rock) specimen under compression loading in the laboratory. It is a brittle failure where sudden loss of strength occurs, with very high noise (like bump) moreover, coal particles ejected very fast from the edges and...

Thanks IceBreakerSours

Hello my friends: I want to use Abaqus subroutine (User defined field variable)in my model, however i am not familiar with FORTRAN. So i need to learn FORTRAN first, so what release of FORTRAN should i learn? is it FORTRAN 77? I am asking this question because i know that there are newer...

I forgot to tell you that the contact type is surface to surface, and the mechanical contact formulation is : penalty contact method. The sliding formulation is : finite sliding. when i checked the results, i found that the frictional shear stress exceeds the predefined value, why? the second...

Hello Abaqus users, I am using Abaqus Explicit to squeeze a deformable body between two rigid platens. The test is quasi-static, and the friction formulation between the rigid body and the deformable body is penalty where the coefficient of friction is 0.3. I assume a limit for the shear...

Hello I know that Abaqus standard ensures the static equilibrium, which means satisfying the following: stress-strain relationship + equilibrium equations + the compatibility equations. While Abaqus explicit ensures dynamic equilibrium. What does it mean? Thanks for the explanation

Hello Abaqus users, I need to extract S33 at the integration point for specified element set (set-1) using python. is there any ideas or if someone already did that before and want to share his experience with me, i would be very glad. please help me. Thanks

As you know there are some empirical method for pillar design, however those methods does not put into account important parameters such as the contact properties between the pillar and both the roof and floor. Moreover it does not account for different geological conditions. Any i guess Abaqus...

Hello Sdebock, How to connect the points of the structure with the reference node?

No the pillars are not in the lab. And we can not test the pillar in the field. I agree with Oldestguy, that the back analysis might be one of the best approaches to get representative rockmass properties.

You know in mining field test on on underground pillar is very rare, so the only option to get an idea about the mechanical properties of rock is to drill core and get some samples, then test these samples. As Mccoy mentioned we might use the rock quality designation of the rock get an idea...

First of all, thanks for your replies. Well, that means we should input the rockmass properties get more reliable results. not the laboratory test results for the intact cores.

Hello There, I want to model a room and pillar mine, so my task is to ensure that the pillars are safe and stable. I will use Abaqus software, In ABAQUS, i need to input the material properties, i have the material properties for laboratory samples (2 in high, 1 in diameter). As you know, the...

why when B and C have no stiffness, A could not see any stress. Could you please explain more? Thanks

Can somebody help me explain some results. i am squeezing part-A between part-B and Part-C, so part-A is sandwithced btween part-b and C, Parts-B and C have the same mechanical properties (same Young's modulus and poisson's ratio). I ran the model two times, in the first time, the ratio of...

Underground mine is similar to superstructure, we cut coal ( make Rooms) and leave some pillars between these rooms, the size of these columns is very big, for instance (60 ft x 60 ft x 8 ft) my job is to ensure that these pillars are stable and safe.

Hello there, I want to model an underground coal mine, the mine is overlain and underlain by different kinds of rock such as Sandstone, Shale,.......etc. I have the laboratory test results for samples of these rocks, the height of the sampel is 2.0 in and the diameter is 1.0 in We know from...

the model is 3D model, the contact is finite strain surface to surface contact. i could not simulate the softening behavior using static analysis. i found that abaqus implicit dynamic helped me overcome the convergence problem. i solved that model without softening, it works without problem. so...