Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Problem using TIE Constraint to bond parts together with a cohesive element in abaqus?

Status
Not open for further replies.

alireza farhadi

Student
Mar 27, 2021
3
I'm trying to connect some parts using a thin cohesive element (traction separation elastic>cohesive section) together using the tie constraint in Abaqus. In a direct-tensile test of this assembly, I get zero stress everywhere. I tried partitioning instead of mounting parts in assembly and using tie constraints; it worked... right results.
I think there might be a problem with the tie constraint. I'll share a minimal working example file showing the problem.
Any Help Would Be Appreciated

 
Replies continue below

Recommended for you

What is the purpose of this initial gap between the cohesive layer and the parts connected by it ? The typical approach is to adjust the coordinates of the nodes so that they lie along the interface (and thus the layer has no visible thickness).
 
I tried to add the gap to make the example and the connecting surfaces more clear, thus in the final version we will delete this gap and the parts will be placed by side to each other( i mean: main part>coh>main part); however, I found deleting this gap by transferring the parts in assembly module having no positive effect on the results I get...

also, I tried editing the mesh nodes coordinate, but with no success...

It is better for me that the thickness be zero, but first, we need to verify the current procedure.


 
Here I will share a minimal examlpe of the problem considering no gap. the cohesive part mesh coordinates are edited so as to produce nearly zero thickness element(right nodes are transferred to 0.01 offset of left side nodes). this has produced errors relating to singularity of the middle part.
editing mesh to produce exactly zero thickness middle part will produce singularity errors either (In 3D, it worked!!)

to clarify the problem: how can I get correct results on tying two parts together with a cohesive element in between (either zero or non-zero thickness), subjected to direct tensile displacement load, in 2D?

the .inp and .cae files of the minimal example are attached

 
Status
Not open for further replies.

Part and Inventory Search

Sponsor