LESSON 7.3 · 1:58 · CHAPTER 7 · FIBRE, RESIN AND TENSION
Tension and angle squeeze out resin
A tensioned band presses on the mandrel with pressure p = T sin²α / (R w): tension times the sine squared of the angle from the axis, over radius and band width. Hoops press hardest, low-angle helicals hardly at all, so for the same tension hoops end up with the most fibre and the least resin.
Predict · at 0:39 in the video
Same tension. Which ends up with the higher fibre volume, the helicals or the hoops?
The hoops. At 20 degrees, a band presses with 12 percent of what a hoop does. At 55, 67 percent.
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 · 7.4 · 1:42More resin, fewer voids