Handbuch Strukturberechnung

Classical Laminate Theory (CLT) for laminates composed of unidirectional (UD) laminae, analysis flow chart, and related topics

This HSB sheet presents how stresses and strains in a laminate are determined by the Classical Laminate Theory (2D-CLT, in-plane). Many examples are included to demonstrate the application of this linear analysis theory. Principally, the procedure is not only valid for UD laminae. Also crossply textiles may be treate dregarding the stiffness analysis.The designations follow Ref. [3] and [4], but not the Poisson ratios. In the Annex, the different use of the layer numbering in design, in FE-codes and in manufacturing is addressed. Further conventions are locally used.The obtained stresses are inserted into the strength failure conditions (criteria) to judge whether one of the two fiber failure modes (FF) or of the three inter-fiber failure modes (IFF) is met. Both these failure mode families are inherent to UD materials.