Convergence errors in Abaqus, Overclosure issue, (Interactions in Abaqus Part - 03)
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- เผยแพร่เมื่อ 23 ต.ค. 2019
- In this video very common Interaction/Contact errors are discussed as below -
***Error: too many attempts made for this increment
***Error: Slave surfaces and master surface intersect each other
***Warning: displacement increment for contact is too big
***The strain increment has exceed fifty time the strain to cause first yield at 110 points
***Excessive distortion at total 126 integration points
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This how a FEM tutorial should be, rather than teaching us just the software. I am just a beginner in FEM and I deeply admire your great depth of knowledge in the field.
I suggest you go with all videos...in most of the videos you will find FEA concepts with software.
Best video on Abaqus interactions so far. Very well explained! Thank you.
Great job!!
Dear sir, I hve problem regarding redundant constraint due to multiple constraint applied in a node. The situation is the steel stud in composite beam need to be assigned by two types of constraint which "embedded region constraint" of concrete in surrounding of steel stud surface and another one is "tied constraint" btw bottom surface of steel stud to steel beam. In this case,some nodes (specifically located at toe of steel stud) hve redundant constraint and abaqus has removed the tied constraint automatically. Consequently, no longer tied constraint exist btw steel stud and beam. This is unwanted removal. Can u suggest any technique on how to ensure both constraint can be applied without any deletion of constraint by abaqus?
Thank You very much Sir
Sir, thanks for videos.
Your videos really helps😊
You are welcome, dear.
I suggest you go with all videos of Abaqus playlist for more FEA concepts.
You are the boss!
Thanks.
3 nodes are used more than once as a slave node in *TIE keyword. These constraints are not removed either due to the presence of *CONSTRAINT CONTROLS,NO CHANGES keyword or because removing the constraints might affect the model. The nodes have been identified in node set ErrNodeOverconTieSlave.
Can anyone help me ? why this error occurs?
Dear,
In error itself it is clearly mentioned.
Some nodes used multiple time as slave. Make them as single slave surface Or flip master slave surface.
Thank you very for your comprehensive tutorial. I am currently modelling a compression of hollow circular shell between two plates, one fixed and one moving. the perimeter is exactly flushed with the plates during assembly but i still receive convergence error and somehow my mesh is distorted from square mesh to 3D triangular mesh when using general contact. May I ask how could i solve this problem. And with regards to self contact within the shell how would you model it to minimize the error? Thank you very much in advance.
Dear,
I need to have a look on results that i comment on results.
Plz mail me on gkn0504@gmail.com
Thank you !!
Welcome dear.
Thank you very much sir
Always welcome.
Dear Sir its a really excellent explanation on this topic. I am new to analysis, if possible can u please do a video on the meaning of CONVERGENCE...?
Dear,
In linear non linear analysis I explained the same. Plz go with that series of 4 video.
th-cam.com/play/PLdXwpuOm8L9pHohWQ2pGi1D4nsmh2nmf4.html
Your videos are Very helpful. Please make a video on gusset plate of roof truss, actually facing problem with boundary conditions of a gusset plate welded with members. Thanks in advance.
Dear Kaushik,
Please let me know where you stucked. I'll try to resolve your problem.
@@simtech0598 I have to design a welded connection of a truss. The connection consist of a 12 mm steel guest plate connected with 3 mild steel angle section. By using static analysis i have calculated the forces in the member, now I have to design the connection, but the problem is with the boundary conditions, obviously the gusset is not fixed because it is an intermediate truss connection.how can I provide the boundary condition to this problem.? And thanks again for you reply.
Dear,
As i can understand your problem, u not need to worry about guest plate BC's till there is no external loaf applied on it. You have to simply make connections between plate and trusses..and make sure the BC's on truss.
However, i need a clear picture of ur model. You can send me details on my mail id, available in description of video.
Sir please help me, if i want modelling rotary friction welding with dissimiliar material joint. And the result that i want is both of those material could be deformed and joint. Which one am i create with CEL concept or ALE methods on abaqus?
Both are capable...but I'm familiar with CEL for such large deformation problems.
@@simtech0598 so if i want create both of material deformable. What should i do.. whether am i making eularian on 2 sidee sir ? Please if could i requested to make a simple tutorial sir. It is really helpful... Thanks
Yes you can consider Eularian tool and Eularian component.
Tutorial not possible currently.. working on Abaqus beginner and Abaqus advance playlist... however, CEL will be part of advance playlist..but will take long time to reach there.
sir, I ran Holzapfel hyperelastic model and got the result. But when I run the model with UMAT I am getting this kind of error
"THERE IS ZERO FORCE EVERYWHERE IN THE MODEL BASED ON THE DEFAULT
CRITERION. PLEASE CHECK THE VALUE OF THE AVERAGE FORCE DURING THE
CURRENT ITERATION TO VERIFY THAT THE FORCE IS SMALL ENOUGH TO BE
TREATED AS ZERO. IF NOT, PLEASE USE THE SOLUTION CONTROLS TO RESET
THE CRITERION FOR ZERO FORCE."
sir, where is the problem and what should I do?
Dear,
As u r using UMAT, error may be in code itself. Not sure about it.
Thnks sir,
How to match nodes at one point of different parts in meshing...plz can u upload vidoe of it
Dear Mangesh,
What you want to ask is not clear. Please clear, you may put image of ur problem on my WhatsApp.
can you share some ideas to prevent chattering in contact
Excellent Tutorial...Thanks...can you explain if in case we have overclosure, how can we run the simulation with it, because, sometimes cad model is such that we cannot edit it, and, we need to work with th model given to us...
So in that case how we can run simulation with over closure...
Thanks...
Dear,
In interactions we have option - adjust to remove overclosure.
Apart from more advance settings we have to treat overclosure.
I have two channel sections connected back to back to form an I Beam, which means I have a large contact area.. I have defined the interaction as Surface to Surface with Small SLiding. But I am facing the same errors. How do I resolve the issue?
Dear,
Plz send image of ur model that i can understand it.
You can send msg on telegram - link is available in video discription.
@@simtech0598 i messaged you on telegram, please check your account. I am desperately in need of some help
I have the same problem as you. Did you solve your problem?
Thank you for the clear explanation sir. Even I am facing this error saying 'too many increments to solve the step' while modelling an MSE wall problem. But I'm not able to rectify it. Can you please help me sir, to resolve the issue. It's my humble request
Dear,
You can explain your problem statement on may mail ID (given in video discription).
Thank you
Always welcome.
Go with all four video..and will upload more on contact and convergence issue.
Sir in 16.16 How to change the orientation of the master surface please reply me sir...
Dear,
I don't have older version of Abaqus so cannot confirm
Sir, I'm getting an error in Abaqus as "Time increment required is less than the minimum specified" and then the analysis gets aborted. How can I solve this problem.
Dear, for this error hundreds of possibilities, video on few possible reason i already uploaded..plz go through interacton in abaqus playlist on my channel - SimTech05
Sir, My ABAQUS simulation aborted due to some errors. But I could not find any message files in the folder. Is there any way to get message file?
Dear,
Make sure you set working directly 1st. All the run file generate into the working directory only.
For large amount of force governing equation cannot be converge. Could you please explain in detail or in another way?
Dear,
Lets consider a simple example. For F= kx
The know force F in vay gradually generally (for static cases), lets assume value of applied force is 10,000 N.
So at beginning of convergence solver not apply 10000 N load intentionally it increases gradually (1000, 2000, 3000.. and so on) if load value is to high...over solver unable to convergence even for initial increments.
Thanks .How to make little bit adjustment for converge the solution? In non linear
analysis lage quantity of mesh can not be used because it is time consuming.
Dear,
You can use slave node adjustment option in contact pair..in my next video i'll some examples through Abaqus software.
@@simtech0598 thank you. can we use ALE adapting meshing techniq for this? Is ALE adapting meshing techniq have any function in this case?
Dear,
ALE mesh have different mathematical formulation with same contact concepts.
However, I'm unable to understand about which case (as u said this case) u are talking.
@@simtech0598 This case which i mean is Interaction/Contact errors, as you mention in this video.Like
***Error: too many attempts made for this increment
***Error: Slave surfaces and master surface intersect each other
***Warning: displacement increment for contact is too big
***The strain increment has exceed fifty time the strain to cause first yield at 110 points
***Excessive distortion at total 126 integration points
Yes, if error is in contact/interaction, we can eliminate by same way.
however, we have some advance options also which i will discuss in upcoming videos.
how about thisproblem sir "Excessive distortion at a total of 110 integration points in solid (continuum) elements" thanks ??
Dear,
There are many possibilities for this error. Like
Wrong material parameters (also check unit consistency)
Intersection between element at contact
Excessively large force/displacement input
Unconstrained motion (in Abaqus/std)
Etc..
Only after checking model one can judge.
SIR G
Can you please explain the concept of using different meshing elements Hex, tet etc?
Dear,
Please follow the link - th-cam.com/video/PhZhNAwUaxI/w-d-xo.html
During the solution of analysis, I got some error which is related to max penetration error at master and sleeve surfaces. Can you help me, are there any methods to solve these type errors. Note:I tried changing size of mesh but it didn't solve problem of max penetration errors.
Yes. You can msg me on my WhatsApp (+91 7891401276) with visuals of ur model.
I have a Question
The thumbnail of this video has errors and warnings that are not described in the video.
Is it incomplete??
Dear,
Go with all other interaction videos also. You will get answer of few errors.
Thanks for the video. It is very helpful for beginners like me. Can you explain the message file how to read the average force, residual force sir. It will be helpful.
Dear,
For many problems msg file shows similar/same keywords. What problem you are facing?
Not facing any problems sir. I just need to understand how the average force and residual force are calculated which is shown in message file
Ok.
I'll try to make video.
@@simtech0598 thankyou sir
Your videos is excellent, I am wondering if there are any pdf file about these content?
Dear,
I don't have any pdf file. You can pause video and write in your own language.
Sir we are getting warning ⚠️ saying.......( solver problem.Zero pivot when processing D.O.F 4of 15 nodes).....
Help where we can correct it in which part
Dear,
Your model is over-constrained possibly.
can you please make video on WarnNodeBCincorret DOF and specify *preprint ,contact=yes error related video
I'll try.
Covering dynamic analysis playlist now days.
Can i contact you sir
Dear,
My contact details available in video discription.
@@simtech0598 i send you a message in your email thank you
nice explanation but the video maker should focus on correct pronunciations!
Ok.
hello, please check your email i send you question there due my abaqus problem
Thank you sir very much
Always welcome dear.