It seems there are three main approaches for this;
1-The first approach is to Modeling adhesive with zero-thickness element.
2-Modeling adhesive zone by cohesive element with finite thickness.
3-We can generate mesh for adhesive zone and insert cohesive element between its elements. For this case we have 3 different type of cohesive element. Two types at both side and one type among adhesive elements (Ignore increasing number of adhesive elements due to finite thickness).
What is your viewpoint?
I would appreciate any other ideas.
Dear Mr. Maleki,
As you mentioned There are two main kinds of cohesive zone modelling;
1) application of cohesive element as continuum elements,
2) application of cohesive behaviour as contact behaviour between two surfaces.
the first is commonly used for the models where the cohesive layer is planer and has simple geometry.
the second is more used for curved surface and complex geometries of interface.
both methods of simulation give the same result so you need to consider your geometry and select the appropriate method.
It is worth mentioning that one may consider three layers of cohesive elements in the middle, top and bottom of interface layer (theses layers should be divided by other continuum elements) this can lead to more precise results but the difference with the case with single continuum layer of cohesive elements is negligible.
The finite element modeling of cohesive zone model is a broad subject and my response was only related to modeling of failure in the interface of bimaterials such as adhesive joints.
hope this was useful!
Dear Mr. Maleki
Because of complicated geometric model,using method
"application of cohesive behaviour as contact behaviour between two surfaces"is appropriate
Dear Mirshad
As Dr. Rasoolan mentioned, and base on my experience, modelling of adhesive by taking surface elements are more proper instead of creating a adhesive part defining cohesive element.
By the way, Mohammad Javad's explanation is comprehensive and tnx to him.
Best Lucks
I suggest checking the following publication link
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070018344.pdf
Thanks for your responses.Be aware that I am not going to choose between cohesive element and cohesive contact, but my issue is about choosing between three main approaches in implementation of cohesive element method. That is why I can insert cohesive elements between solid elements by using an in-house program and it is not possible for me to define cohesive contact between every two solids in my problem due to large number of cohesive contact surfaces which there exist in my problem. As mohammad javad mentioned If we can insert cohesive elements between solids easily, there are not considerable differences between two approaches.
- Badges
- Science method