Consecutive plies and the rule checker
Guidelines also cap how many same-angle plies sit together (two in one list, three in another; AddPly's wing spar example declares four). AddPly checks consecutive plies, symmetry and balance live on each region's ply order, and says plainly that these checks do not evaluate fibre direction or manufacturability.
Predict · at 0:44 in the video
Set AddPly's limit to one, on that eight-ply quasi-isotropic stack. Does it pass?
No. It names plies four and five: the two nineties at the middle. Set the limit to two, apply, and the same stack passes.
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.
