Hello,
I have a simple conceptual toy problem that I am trying to implement in Abaqus, but without success. Could someone please help me?
I have a cut sector of an annular sheet (see picture). Imagine it to be made of paper in real life. If I now bring the two edges (lying along the x-axis...
Hello,
I had a question relating to the difference between Explicit and Implicit solvers, especially in the quasi-static limit. I know that Abaqus simulations require us to specify a mass density. I can understand that this is essential for Explicit jobs, which are designed to take inertia into...
Hello,
I know that one can plot the surface normals in Abaqus using Plot->Orientation. I want to know the values of these (unit) normals, i) either by copying it directly from Abaqus, or better still, 2) extracting these surface normals using python as part of post-processing, much like any...
Hello,
I asked a question on Engineering Stackexchange, but I think it might have a better chance of being answered on this Abaqus-only forum. Can anyone help me? The post has all the details, including pictures...
Hello,
I am using dynamic, implicit integration (quasi-static mode) in an analysis, and I am trying to understand how it works. The documentation (https://abaqus-docs.mit.edu/2017/English/SIMACAEANLRefMap/simaanl-c-dynamic.htm) talks about using 'numerical dissipation'. What does that mean? How...
Hello,
I am trying to make an array of narrow, straight cuts (as the two in the image below) in a rectangular 2d part made of shell elements.
However, I keep getting the error 'Cut extrude feature failed', or if I try using the Linear Pattern (see image below) or Translate features, I get...
Hello,
Can someone tell me if it is possible to extract surface normal vectors from Abaqus using scripting? For the record, I can script enough to get field and history outputs.
Thanks in advance.
Hello,
I have a complicated 3d part, whose outer surface I have managed to select as a Surface. Now, how can I create an element set or node set from this surface? It should be possible, but I cannot find any obvious way to do it. Thanks!
Hello,
I wanted to do a quasi-static analysis, and someone told me to use Dynamic implicit mode (with quasi-static turned on). I just want to understand what dynamic implicit mode means? It's named dynamic, but it runs the static solver (static.exe). What is the difference between it and...
Hello,
Suppose I have calculated buckling eigenmodes for a part with shell (S4R) elements, which I want to use as a perturbation for a post-buckling analysis. Can I use these same eigenmodes (what you need are the .fil file and .prt file) if I re-construct the same part in 3d, say with C3D8R...
Hi,
I am trying to write a script to extract field output data from odb's. I want to know how to transform the data using a user-defined CSYS which is already stored in the odb. Can someone please help me? Is it even possible to do so?
The Abaqus scripting guide has a page on creating new odb...
Hello,
I am trying to export the end result of an Explicit job to Implicit. The job starts, but then quickly exits with the following warnings and error. Can someone please help me to diagnose and fix the problem?:
***WARNING: THE SYSTEM MATRIX HAS 41221 NEGATIVE EIGENVALUES...
Hello,
I am using the dynamic, implicit mode (hence static solver) for the first ever time. My last job gave me many 'Negative eigenvalue' warnings. Could someone please tell me what this means?
Hello,
I just did a linear buckling analysis for my situation and got a value of around 4e37 for the lowest eigenvalue. This is huge! So huge in fact, that I cannot use it as a starting value for my post-buckling analysis. The computer only handles as large as 1e36. Can someone please explain...
Hello,
I have a quasi-static problem for which I want to try using the Abaqus static solver. What I want to do is start with some parameter values, run the job, and then use the final configuration as the starting configuration for a new job with new parameter values. Can someone please tell me...
Hello,
I have a part made of 3d elements, and I have been wondering how to make element and node sets out of only the top surface elements and nodes. I know that one can define Surfaces, but can surfaces be treated like element/node sets?
Hello,
I want to do quasi-static simulations using Abaqus (Explicit). I read online that mass scaling is the best way of minimising kinetic energy and inertia in the system. The Abaqus manual mentions applying it in the 'Steps' section, but I don't quite see how to do it.
Can't I just set a...
Hello,
A recent job exited with the error -- 'Excessive distortion of element number ... of instance ...'.
What does this mean, and how can one deal with it? Do I just increase the mesh density?
Hello,
I am trying to make a model where I apply a surface heat flux load to a disk. For this, I need to define a surface, which I to do. The load is defined properly, as shown by the green arrows in the attached photo. However, when I run the job, I get the same error for all the elements in...
