COHESIVE ZONE MODEL FRACTURE

[Francesca Pistorio]

Good morning,
I have a doubt regarding the cohesive zone model that I can't solve and I hope that someone can help me.

I read that the so-called separation "delta" represents the separation between the two surfaces of the crack. The traction separation law links the traction force in the fracture process zone with this separation.

Considering for example a bilinear traction separation law. Whent the traction is greater than zero, the separation is greater than zero. Does it mean that the crack surface begins to separate? It seems that the fracture process is modelled as a gradual process, with the separation between crack surface monotonicallt increasing untile the final separation is reached (and the crack grows).

Is this correct?

Thank you for you help.

Kind regards,

Francesca

[Wolfgang Bangerth]

Francesca,

> I have a doubt regarding the cohesive zone model that I can't solve and I hope
> that someone can help me.
>
> I read that the so-called separation "delta" represents the separation between
> the two surfaces of the crack. The traction separation law links the traction
> force in the fracture process zone with this separation.
>
> Considering for example a bilinear traction separation law. Whent the traction
> is greater than zero, the separation is greater than zero. Does it mean that
> the crack surface begins to separate? It seems that the fracture process is
> modelled as a gradual process, with the separation between crack surface
> monotonicallt increasing untile the final separation is reached (and the crack
> grows).

I think you need to provide more context to your question. You assume that
everyone knows what the "cohesive zone model" is you are referencing, but we
don't. As a consequence, much of the rest of your question is likely not going
to make much sense to most on this mailing list either.

Best
W.

--
------------------------------------------------------------------------
Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/

[Francesco Costanzo]

Hi Francesca,

It seems to me that your question is more about modeling than it is about FEM implementation. I’d be glad to correspond about the model offline … you can email me directly at f...@psu.edu … I have some experience with CZ models.

Cheers, FC.

--
Francesco Costanzo, Senior Associate Department Head
Engineering Science and Mechanics Department
Professor of Engineering Science and Mechanics,
Mathematics, Mechanical Engineering,
and Biomedical Engineering
Address:
Center for Neural Engineering
The Pennsylvania State University
W-315 Millennium Science Complex
University Park, PA 16802
USA
Phone: (814) 863-2030
Fax: (814) 865-9974
mailto:fx...@psu.edu
http://www.esm.psu.edu/Faculty/Costanzo/

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