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How to define initial stiffness matrix for cohesive elements in ABAQUS

I am trying to  model adhesive failure using cohesive elements in Abaqus. I need to define the elastic behaviour of elements using traction separation criteria.

So I wanted to know what is the E/Enn, G1/Ess and G2/Ett values for my adhesive(E=1650 MPa)?

Till now what I could understand is that this is the element stiffness which relates my traction with displacements. But I also read that the stiffness should be defined as high as possible so that it doesn't effect the overall stiffness of the structure. I am a bit confused with this and some help would really be appreciated.

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Hi, I was wondering if you found any more information on this issue?

I have the same problem. I am trying to represent the adhesive layer with a layer of cohesive elements and I'm not sure how the parameters you've mentioned above hysically relate to the material.

Hi,

when you are using cohesive elements with traction-seperation law (not continum approach), pay attention that the stiffness parameters no longer have physical meaning. I mean you cannot use exactly young moduli of adhesive material , but a rule of thumb is to divide it by the cohesive element thickness. anyway, stiffness here is a penalty stiffness i.e you can choose it freely as long as your model converge and more precisely your results correlate with experimetnal results if you have.

for more information feel free to write to AbaqusSite@gmail.com

Best,

Mohammad

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