How to plot and preview hoop stress of cylinder

[FEA Engineering]

Dear All,

I'm working on impact analysis of composite overwrapped pressure vessel. I have completed impact Simulations with various impact energy. But, I have proble how to get Hoop and radial stress results in the ls Dyna post processing. I try to create and change using cylindrical coordinate system' in general-settings,. But nothing changes in my screen... 

Please anyone have video or material related with this issue can help me...

Regards

Akbar