Hi,
I am about to make my first Carbon Fibre part. I have read about alternating layers at 0deg, 90deg and 45deg for added strength. This makes sense but looking at 2/2 twill, is there a difference between 0deg and 90deg? With the sample I have got, the horizontal threads look thinner but when you turn it 90deg the horizontal threads still look thinner so it is an optical illusion. Is there a structural difference between the 2?

Brian.

0 degrees is a bit stronger than 90, as the warp is under tension when being woven.