Hello everybody,
I am working on the the fracture analysis of a crack between 2 materials (interface cracks) in Ansys. I understand that mode mixity is a very critical parameter in interface cracks. There are a lot of methods proposed in the literature to determine mode mixity (using modified VCCT, complex SIF solutions, CSDEM). I am specifically into the one of the form in 'Hutchinson et al' refer (page 85 eqn 2.57) of the attachment and CSDEM, refer (page 6 eqn 6) of the CSDEM attachment. Each of these methods give a different mode mixity (psi) as shown in (Agrawal-Literature - Page 17 Fig.5 ).
I would like to know
- If there is any criteria on the choice of the method to use? Like how can one justify choosing a method?
- Also, I understand mode mixity intuitively, but how does one confirm that the mode mixity values (from FEM) are indeed correct. I could not find analytical solutions for complex 2D and 3D problems.
It would be great to hear from the learned.
Thanks in advance for your time.
Regards,
Shree
Interface zone between two materials (like e.g. interface between cement paste and aggregate) has specific material properties that are different from each of them. I suggest to use in your F.E. analysis with Ansys a F.E. mesh including also interface as a material in itself. See for example last works on meso-level analysis of concrete that I have published with my coworkers (G. Xotta, G. Mazzucco, V. Salomoni and B. Pomaro).
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