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Cohesive Zone Model and XFEM

Hello all,

I am trying to model crack propagation in ABAQUS to simulate four point beam bending test. I am using 3D model. I am using XFEM for propagating the crack. I am not getting the required output parameters ( J-integral and SIF ), instead i am getting only PHILSM and PSILSM. I dont know how to extract the required parameters from these two values. For modelling a crack propagation, whether CZM is reliable or XFEM is reliable??. What are the disadvantages of CZM over XFEM( other than predefined crack path ). Any suggestions will be really helpful. Thanks in advance.

with regards,

P.Prasanthi

 

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Emilio Martínez Pañeda's picture

Dear P. Prasanthi

I am not following the latest developments but, to my knowledge (i.e., version 6.12), X-FEM in Abaqus is only able to compute the stress intensity factors for the case of a static non-propagating crack (and of course you could also do that with conventional FEM). Everything is described very well in the documentation.

Regarding your last question. Abaqus offers the possibility to use X-FEM with a traction-separation law criteria for crack propagation. Despite the fact that Abaqus X-FEM implementation is far behind of what the X-FEM community is doing, I found it very reliable. In the following paper you can see that the experimentally observed crack propagation is captured very well in the modeling:

http://link.springer.com/article/10.1007%2Fs10999-014-9265-y

In case that you do not have access, you can find an author's pre-print version in www.empaneda.com

I hope this is useful.

Emilio Martinez Paneda

 

Thankyou 

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