Where is the part , for your (break stress) calculations for carbon , that take into account, thebohme wrote: ↑Tue Jun 16, 2020 12:28 pmThere is too much BS in this thread.
This was originally about a 2 level bridle made possible by using some FLEXIBLE battens.
I will now explain why glass fibre might be a good choice for THIS application:
Imagine you have a straight rod batten you want to curve into a closed circle. You can either use GF or CF.
T700 carbon fibre : 1200MPa break stress, 120GPa modulus, 1% break strain level
E-glass fibre : 800MPa break stress, 40GPa modulus, 2% break strain level (yes, it look bad...)
For the same battens properties (same force and diameter of the closed circle), both M (bending moment) and EI (beam stiffness) MUST to be identical.
For this to happen I (moment of inertia) need to be 3 times higher for GF. It is not looking good for GF...
The thickness of the GF rod needs to be 1.316 timers thicker. GF is looking heavy...
HOWEVER, The formula for stress My/I shows that CF has 229% higher stress level than GF, but only 50% extra strength. OOOPS
Glass fibre is stronger than carbon fibre. For THIS application.
added "Strength" ya get with the carbon , when a , (Ballistic fabric) is added ?
Did You conveniently, just Leave that out ; or was it a mistake ?