Why fibres wander
Woven fabric fitted to a dome behaves like a pin-jointed net (Mack & Taylor 1956): the yarns can't stretch but the weave shears, so the 0/90 grid stays square along the two starting fibres and closes up towards the diagonals; our net reaches 42° of shear near the rim before it runs out of room.
Predict · at 0:48 in the video
Do the fibres stay at zero and ninety everywhere?
No. Along the two starting fibres, they nearly do. But out along the diagonals the squares close up.
This course is our own. These books go deeper.
- Basic Mechanics of Laminated Composite Plates, A. T. Nettles, NASA Reference Publication 1351, 1994
- Mechanics of Composite Materials, R. M. Jones, Taylor & Francis, 2nd ed., 1999
- Engineering Mechanics of Composite Materials, I. M. Daniel & O. Ishai, Oxford University Press, 2nd ed., 2006
- Design and Analysis of Composite Structures, C. Kassapoglou, Wiley, 2nd ed., 2013
- Composite Materials Handbook (CMH-17), Volume 3, Rev. G, CMH-17, SAE International, 2012
The course designs in AddPly, our browser app for laminate design: regions, ply stacks with live stacking-rule checks, thickness, mass and the ply book. It does not do strength, failure or draping; where a lesson covers those, the simulation is our own.
Simulations in this lesson are our own. Ply data come from the datasheet or textbook named on screen; where a number rests on an assumption, the video says so.
