Regions
A region is a patch of the part with its own plies. The spar example has 11: the whole web (a whole tooling face) and rails and root pads cut out of it by boundaries drawn on a plane and clipped exactly; the web carries 16 plies (2.144 mm), a top rail adds 4, a root pad 2.
Predict · at 0:52 in the video
Why not give the whole part one stack?
Because the loads aren't the same everywhere. One stack would be too thick in some places, or too thin in others. Too thick costs weight.
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.
