What does the [2/4/4/2] notation in composite ply layup represent?

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SUMMARY

The notation [2/4/4/2] in composite ply layup specifically indicates the number of plies for each orientation in the sequence [0/+45/-45/90]. This means there are 2 plies at 0 degrees, 4 plies at +45 degrees, 4 plies at -45 degrees, and 2 plies at 90 degrees, totaling 12 plies. The second part of the notation, [45/0/-45/45/90/-45], details the specific angles of the plies, confirming the redundancy of the first notation since it conveys the same information about ply orientation.

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Dave-Eng
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Hi,
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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Hi Dave-Eng, I think I've just answered your own question:
The [2/4/4/2] refers to the number of plies of each orientation [0/+45/-45/90] respectively.
You could also argue that this is completely redundant because this information is captured within [45/0/-45/45/90/-45]s
 

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