Cohesive Zone Modeling
Cohesive Zone Modeling
(OP)
Hi to everybody,
i'm trying to do a simple test on cohesive materials.
The model is composed by a cantilevered beam made by two layer of steel glued together by a layer of glue.
Working units SI,mm
Plate dimension lenght 500mm width 100mm thickness: steel 10mm, glue 5mm, steel 10mm.
Type of mesh, hex8
Steel prop. E 210000, ni 0.3
Cohesive material prop.
cohesive energy 40
critical opening displ 0.01
max opening displ 0.1
ratios 1
energy dissip. 10E-5
i've applied a force at the end of the beam on the node of one of the steel layer, pulling the layer down.
I expected that, reached the maximum opening displacement,the layer of glue breaks... but this does not happens.
Tied to change the values of glue and value of the load but no difference in results.
Any idea?
Thanks
i'm trying to do a simple test on cohesive materials.
The model is composed by a cantilevered beam made by two layer of steel glued together by a layer of glue.
Working units SI,mm
Plate dimension lenght 500mm width 100mm thickness: steel 10mm, glue 5mm, steel 10mm.
Type of mesh, hex8
Steel prop. E 210000, ni 0.3
Cohesive material prop.
cohesive energy 40
critical opening displ 0.01
max opening displ 0.1
ratios 1
energy dissip. 10E-5
i've applied a force at the end of the beam on the node of one of the steel layer, pulling the layer down.
I expected that, reached the maximum opening displacement,the layer of glue breaks... but this does not happens.
Tied to change the values of glue and value of the load but no difference in results.
Any idea?
Thanks





RE: Cohesive Zone Modeling
RE: Cohesive Zone Modeling
Anyway how i can determine if some elements have a damage?
Thanks
RE: Cohesive Zone Modeling
RE: Cohesive Zone Modeling
In addition i can not attach the MASTER result: the following error message is visualized:
$# An internal error occurred when retrieving Direct Results Access data in routine: "DraGetStateData".
RE: Cohesive Zone Modeling
RE: Cohesive Zone Modeling
No news good news... scr=post doesn't works... the problem remains :(
RE: Cohesive Zone Modeling
RE: Cohesive Zone Modeling
Another question... why do you use prismatic elements for cohesive??
RE: Cohesive Zone Modeling
RE: Cohesive Zone Modeling
I am interested in knowing if there is an analytical relation for the calculation of the critical opening of a cohesive material. Normally this is something that is calculated from experimental results, however from a given test (DCB) we have the following mechanical properties:
sigma_o = 55 N/mm2, tau_ο = 120 N/mm2 and Gc = 0.8 N/mm.
The constitutive model that will be used is the exponential. I suppose there has to do with a relation between Sigma_ο and Gc.
Any information (including additional info if for example a bilinear or linear exponential law is selected) will be useful.
Thank you in advance for your assistance.
RE: Cohesive Zone Modeling
MSC MARC 2012 Volume A: Theory and user Information pp. 517 to 525.
Let's hope that someone will find this useful.
PS: As to the model provided by hezhj2000 in a previous post, I confirm that it works on my machine too.
RE: Cohesive Zone Modeling
thank you for your reference .... it's very useful!