Hi Alok,
If you want to calculate the energy release rate (G) using the virtual crack closures technique (VCCT) (if this is the case) then you need to modify your Analysis Settings. You need to deactivate the calculations for the SIFS J-Integral Material Force and T-Stress. You also have to turn OFF large deformation.The other fracture calculations do not support spanning multiple materials. If those calculations are active then the solver issues the error message.The VCCT calculations are incorrect because it does not support large deformations. You must deactivate large deformations to calculate G.
Regards,
Ashish Khemka
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