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Crack Propagation by Cohesive Element

Hi everyone,

 I've been working on crack propagation problem by cohesive elements in Abaqus.

 I have a sandwich struture where adhesive bonds two steels together. And I've attached part of my input file in the following.

 I can have the stress and strain distribution, but I really expect the crack will propagate in the midplane of the adhesives. I don't know whether I have to preset a line in the middle of adhesive as existing crac, or I can set some crack interaction to get the crack growth result. 

 I've stuck in this problem for several days, and tried to found out online. However, I've met several similar problems but no solutions provided. I really appreciate that some idea or advice could be given. 

 Thanks a lot,

I set the adhesive property is *Material, name=Mat_Adhe
*Damage Initiation, criterion=QUADS
 3.3e+06, 7e+06, 7e+06
*Damage Evolution, type=ENERGY, mixed mode behavior=POWER LAW, power=1.
330.,800.,800.
*Damage Stabilization
0.001
*Elastic, type=TRACTION
 8.5e+08, 8.5e+08, 8.5e+08

  The step is *Step, name=Step-1, nlgeom=YES, inc=10000
*Static
0.005, 1., 1e-09, 0.01

  And the field output is *Node Output
CF, PHILSM, RF, U
*Element Output, directions=YES
LE, PE, PEEQ, PEMAG, S, STATUSXFEM

 history output is *Node Output, nset=Total-1.Set-1
RF1, RF2, RF3, RM1, RM2, RM3, U1, U2
U3, UR1, UR2, UR3
 

 

rajnish0007's picture

Hi Rey 

if you are using the cohesive zone modelling then cohesive elements should start opening in normal and shear directions as your failure criteria will met on the nodes. Also no need to have  pre inserted cracks in the model. you can look up the example manual of the Abaqus for the delamination problems, as your problem it similar to that.

I hope it will help you

Cheers  

Rajneesh

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