In my previous column (HPC March 2006, p. 9) I discussed the advantages of testing a cross-ply laminate and then "backing out" the unidirectional composite strength. This included both tensile and compression testing. A cross-ply laminate was defined as a composite with all plies oriented at 0 deg or 90 deg; that is, any one of the [0/90] family of laminates, with arbitrary numbers and distributions of 0 deg and 90 deg plies. However, it was indicated that one could back out unidirectional strength from other, more general laminates, but not as advantageously.
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