Group velocity dispersion curve error

[Eyüphan Küçükkalfa]

Hi,

I try to obtain a group velocity dispersion curve of honeycomb cored sandwich composite material. But, when I input material orientation and stiffness matrix, I get the output as I attached here. Is there anyone who face this problem before and knows how to figure it out?

Thanks,

Eyüphan Küçükkalfa

 

[何俊]

Hi, I had a similar problem, have you solved this one yet?