cohesive element

Hello all,

I'm trying to model composite delamination under non-severe impact on layered composites in ABAQUS/Explicit.

To begin with, I've modeled a 2D aluminum with a finite very low thickness cohesive layer with traction-separation behavior between. Then, I give some displacement to the middle-top node to simulate an impact scenario. However, even in this simple configuration, I'm having stress distribution problems when the models with cohesive layer between and without cohesive layer are compared.

I'm modeling rock fracture problem with cohesive element. I konw the propertiey of the solid element around the fracture because we can measure it (rock sample) in the lab. but as regard to how to define the propeties of cohesive element, I'm completely lost.

in fact, the cohseive element is a fictitious one, not a real matearial in the physical world, we can't mearsure its propety by physical means. then how can we know what parameters we should enter ?

need your help, thanks

hi,

    recently,i want to write a delamination law using vumat,but coh3d8 element with  a traction-separation has s33,s13,s23.in vumat,stressold(nblock,ndir+nshr),i don't kown if s33 is  correspond to stressold(nblock,3),and if s23 is  correspond to stressold(nblock,5),

   i hope someone can help me.

Hi. I am currently using cohesive element traction-separation law for modeling interface element between FRP and concrete. Can any one tell me how to define the contact state if the corresponding cohesive element is under compression in ABAQUS?   Yes, it's said that there won't be any damage if pure compression is applied to cohesive element, but my questions is how to consist of assuming that friction occurs on the damaged part as there is no friction definition in cohesive traction-separation law.   Please add comments if you know something about this. Thanks for help ^_^

Hi all:

When I simulate a crack propagate along interface between film and substrate with cohesive element, different load-deflection curves of film were achieved when I applied load or displacement on film, respectively.  I think it should achieve same results regardless which kind of load I selected.  Please help me find what’s wrong with my simulation.