@Wenbin I believe Double-Double (DD) laminates, when combined with trace-based scaling using Tsai’s modulus, can unlock tremendous possibilities for composite design. DD laminates are homogenized structures that offer many advantages.
For example, the standard design of a wingbox is a complex and cumbersome process, often requiring multi-level design strategies to address local issues—such as buckling—concurrently with global challenges, such as the blending problem. Because DD laminates are inherently homogenized, they can be tapered seamlessly and are intrinsically blending-free.
Designers can use the master-ply for structural design and to identify the optimal Double-Double configuration, and then apply trace-based scaling with Tsai’s modulus to select the material—confident that the predictions will remain accurate. This approach can save aerospace companies hours, if not days, of computation time.