ABSTRACT
This chapter presents a recent approach to an optimized design of high-performance laminates. Based on the work of Pr. Stephen Tsai and his team, the concept allows the construction of quasi-orthotropic laminates by stacking sets of sublaminates known as D-D sublaminates. In so doing, each set is composed of four plies and characterized by two privileged directions (Φ, Ψ), each doubled according to the pattern ± Φ and ± Ψ. The study is detailed here and shows numerous advantages over Quadrangle Symmetric laminates [0°; ± 45°; 90°] so-called Quad laminates previously described in Chapter 5. Resistance of such DD laminates is easier to check and their manufacturing is well suited to automated tape laying. The digital implementation of the laminate optimization process requires a specific calculation tool. We give about it useful information for free access.
