2D Crack Growth with Inclusion - Tutorial not working with 6.12
2D Crack Growth with Inclusion - Tutorial not working with 6.12
(OP)
Hello all, thank you in advance for taking a look at this.
I'm a new ME grad student trying to learn Abaqus and I'm having trouble with a crack growth tutorial.
Link Tutorial
Link CAE file
It may work for v6.9 but it's not working for v6.12.
I downloaded the .cae file and run into the exact same issue as when I tried going through it step by step.
When running the job submit, I always get, "Error in job IncCrack: Too many attempts made for this increment." "Aborted due to errors."
Any ideas?
Thanks again, this is all VERY new to me although I had some experiance with ANSYS a few years ago.
Daniel
I'm a new ME grad student trying to learn Abaqus and I'm having trouble with a crack growth tutorial.
Link Tutorial
Link CAE file
It may work for v6.9 but it's not working for v6.12.
I downloaded the .cae file and run into the exact same issue as when I tried going through it step by step.
When running the job submit, I always get, "Error in job IncCrack: Too many attempts made for this increment." "Aborted due to errors."
Any ideas?
Thanks again, this is all VERY new to me although I had some experiance with ANSYS a few years ago.
Daniel





RE: 2D Crack Growth with Inclusion - Tutorial not working with 6.12
To make it work you can:
1. decrease your mesh size (this will probably help) or use normal elements instead of reduced elements.
2. decrease the maximum time increment: everything goes fine until the thing starts cracking, and the solver needs to decrease the incrementation size, but it reaches the default 5 step backs before being able to solve the increment, i.e. "Too many attempts made for this increment".
2b. Change the default incrementation settings, I changed the default 0.25 step back to a 0.1 one, so you can calculate fast in the beginning, and cut back fast too. This is not advised.
So changes to make it work are:
*Element, type=CPS4
*Static
0.05, 1., 1e-08, 0.05
*Controls, reset
*Controls, parameters=time incrementation
, , , , , , , 8, , ,
0.1, , , , , , ,
Also, no student posting here, ask your supervisor next time.
RE: 2D Crack Growth with Inclusion - Tutorial not working with 6.12
I didn't realize grad students weren't allowed but I won't post anymore threads.
My supervisor is trying to learn this software as well so I'm not able to get any help there.
Do you have a suggestion where I should (or can) get information and help from time to time?
Thanks,
Daniel
RE: 2D Crack Growth with Inclusion - Tutorial not working with 6.12
But if you ask good questions (and not homework assignments), maybe you can get away with it here ;)
RE: 2D Crack Growth with Inclusion - Tutorial not working with 6.12
In that case I'll pick your brain some more if you don't mind.
I spent a couple hours trying to implement your suggestions:
- 1. Decrease mesh size - I decreased all the way to only 5 nodes per edge and still had the same error.
- 2. Decrease max time increment - If that's the increment under Step - Loading, I changed to 0.05, 1, 1e-08, 0.05 but still had the same error.
This looks like part of you INP file, right?[li] 2b. Increment setting - I wasn't sure how to change this but you didn't recommend it anyway.
I tried changing the INP file but realized when I hit submit it was just overriding it.
I changed the INP file to match what you posted and then imported into a new file. Running this still had the same error.
The only way I could get it to run without errors was to decrease Load (pressure) from -700 to -300 but that was not enough to actually create any deformation.
RE: 2D Crack Growth with Inclusion - Tutorial not working with 6.12
RE: 2D Crack Growth with Inclusion - Tutorial not working with 6.12
What I did was 1. change the element type from reduced to normal:
Refining the mesh probably has the same effect.
*Element, type=CPS4
2. Decreased the minimum allowed time increment:
*Static
0.05, 1., 1e-08, 0.05
3. And set the default cutback to a factor 0.1 , and the maximum number of allowed cutbacks to 8:
*Controls, reset
*Controls, parameters=time incrementation
, , , , , , , 8, , ,
0.1, , , , , , ,
You can check documentation for these keywords to see the way to do this in CAE.
You can run .inp 's by doing
abaqus analysis job = jobname.inp
in command line
RE: 2D Crack Growth with Inclusion - Tutorial not working with 6.12
contact him and maybe persuade him to also update the page (or at least post what he told you here for future ref). he works for dassault simulia anyway so it couldn't hurt...
RE: 2D Crack Growth with Inclusion - Tutorial not working with 6.12
RE: 2D Crack Growth with Inclusion - Tutorial not working with 6.12
Messing with tolerance values can have serious consequences on the result, so watch out with that.
For the second part of your question, in this example the crack is initiated, and growth depends on the material (damage) properties and loading.
RE: 2D Crack Growth with Inclusion - Tutorial not working with 6.12