LESSON 2.3 · 2:39 · CHAPTER 2 · THE NETTING IDEA
You don't need 0 degree fibres
A winder can't lay fibre straight along the axis, and it doesn't need to: the axial stiffness of a ±α tube is flat near zero, so ±10° costs only about 8%. The stiffness collapses between 15° and 45°.
Predict · at 0:58 in the video
From zero to plus and minus 10 degrees, how much axial stiffness do you lose: 8 percent, 30, or 50?
About 8 percent: 124 gigapascals instead of 135. Near zero the curve is almost flat, so the first few degrees cost almost nothing. Double it to 20 degrees, though, and you've lost a third.
Further reading
This course is our own. These books go deeper.
- Composite Filament Winding, S. T. Peters (ed.), ASM International, 2011
- Filament Winding: a Unified Approach, S. Koussios, Delft University Press, 2004
About the numbers
Simulations in this lesson are our own. Where a number rests on an assumption, the video marks it with an asterisk and says where it comes from.
Up next · 2.4 · 2:53Design it to fail in the hoops