You can model two parts and mesh them. You can merge all nodes except the one where you want define a delamination. In this case you have a look to the local effects. If you want to model global effects, you can work with reduced stiffnesses (with a material law). Here you have to distinguish if you have tensile or tension.
Thank you Christian, but will there be penetration of two surfaces in delaminated region using the method suggested by you? Previously i created delamination using tie constraint, i.e creating two surfaces and tie those two except delamination region, but there was penetration of two surfaces..
Of course there are penetrations. If you allow it, you model a delamination, where the surfaces are not in contact. This is possible if the deformation is small and/or the distance between both delamination surfaces is "large".
If you need the contact, you can define a contact formulation between both surfaces (penalty, Lagrange multiplier or mixed formulations). Everytime it depends what you want to describe by your model. If you want to have a global scale effect, maybe the change of the material law is enough. If you are interested in the local effects, you have to take the details into account.
Actually i dont want the surfaces to be penetrate? How to avoid it?
The distance between the deleminated surfaces is very small, like they are in just touch with each other.
You can use cohesive zone elements to avoid penetration of the delaminated plies. However this problem be solved in 2 steps. First apply the load on the structure to get the cohesive elements fully damaged(delaminated). In the second step apply your loads on the delaminated structure to get the desired results.
The more simple is to realized a untied surface (delamination area) and a bond surface (tied). Use interaction --> Surface to surrface ---> allow separation to buid the untied surface
You can define a cohesive contact formulation with different interactions properties in various regions along the interface. Create partitions and sets where the different properties are assigned.
I can send you some documentation if you are interested?
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