How do i calibrate cohesive elements?

[loki3000]

Hello

i have to calibrate the coh elements in abaqus so that the base material (steel) and coh have the same resultant displacement, stress... (basically a homogenous body). the steel elements are C3D4, coh is COH3D6, the model is under uniaxial stress as seen in the picture. (the coh elements are in between the two bodies)

the problem i am having, is that i get strange readings in the S13 and S23 stresses. as i understand it, it's due to glue's resistance to deformation in x and z direction (on image). how do i correct this? i've tried the same value of G as the steel (G = E/(2(1+poisson)) ) but to no success.

the pictures are here:

http://img502.imageshack.us/i/modelm.jpg/

http://img502.imageshack.us/i/modelm.jpg/

http://img262.imageshack.us/i/s23.jpg/

 

[loki3000]

if i haven't been clear -- i need to get as uniform stress state as possible, without any strange behaviour if possible.

 

[cloa]

Post in the ABAQUS Forum- you'll get a better response