LESSON 8.3 · 1:40 · CHAPTER 8 · TESTING, TANKS AND WHAT'S NEXT
Weeping before bursting
In a ±55° pipe under pressure, the resin cracks across the fibres at small transverse strains (a few tenths of a percent), long before the fibres reach their limit. The cracks link up and the pipe weeps. That is why pressure vessels have liners.
Predict · at 0:31 in the video
In a plus and minus 55 degree pipe, which comes first: weeping, or burst?
Weeping. The resin cracks at a few tenths of a percent of strain across the fibres. The fibres would take five or ten times that.
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 · 8.4 · 1:44Autofrettage