Fellow composite-using engineers:

thread327-334726: Layup sequence notation covered similar ground to my present query. I have a document containing lay-up notation [[(0,90)/(±45)]3]s.

I am working with structural analysis in which this lay-up has been interpreted as 0/45/90/-45/0/45/45/0/-45/90/45/0, i.e. 0/+45/90/-45 4/2/4/2. I can see the reasoning behind this interpretation. The first ply can be 0 or 90 (0 chosen), the second can be +45 or -45 (+45 chosen). In the first repeat, the choices have been reversed, and again in the second repeat. The second set of six plies mirrors the first, achieving symmetry.

The material is a 5-harness satin, so I have a feeling that there should be equal numbers of 0 & 90 and +45 & -45. Could anyone more acquainted with the notation than I am, please advise as to the correctness of the interpretation in the analysis file with which I am working?

I have not been able to contact the manufacturer.

Thanks in anticipation.