Hi,

I am trying to understand behaviour of UD composite as I increase an angle from 0° . Is this changing the same way for all types of fibres or has to be determined experimentally?

I thought it is related to transformation matrix formula  for strength qx= q1*cos^2 (angle) + q2*sin^2(angle) + 2Tau*sin(angle)*cos(angle)  

but compare with strength vs angle plots I found online it does not change quite the same way.

Thanks,

Stan