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I've come across this notation to describe a composite ply layup:

[2/4/4/2] – [45/0/-45/45/90/-45]s

I know that the second part is notation for: [45/0/-45/45/90/-45/-45/90/45/-45/0/45]

But what is the [2/4/4/2] in referrence to?

I have noticed that 2+4+4+2 = 12, and there are 12 ply orientations but I don't know if that is coincidence.

Thanks for any help people can share on this.

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# Composite ply layup notation

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