Backout factors

[no2metal]

Does anyone has any info on using Backout factors in calculating UD (0 degree) lamina property from crossply (0/90) laminate
Thanks in advance

 

[SWComposites]

Which property? stiffness? strength?

To get UD E1, you will need data for E2 (or make an extimate), then use laminate theory to back calculate E1 from Ex of the 0/90 laminate

For UD tensile strength, calculate the P/AE strain for the 0/90 laminate, then multiply the strain times the UD E1 to get UD tensile strength.

 

[no2metal]

Thanks SWComposites for your info.
I did find an article by Dr. DF Adams (High Performance Composites -March 2006)