Multi-objective optimization of HUMM3-assisted ICAT repass treatment using Taguchi method in DoE

The multi-objective optimization of the repass consolidation process was carried out by the Taguchi analysis algorithm, and the mechanism of its effect on warpage-deformation, porosity, crystallinity and mechanical properties was revealed in this work. An optimization method to quantify warpage-deformation was proposed, and the relationship between residual stress and warpage-deformation was analyzed by the hole-drilling method. The significance of repass consolidation speed (RCS), temperature (RCT) and force (RCF) on multi-objective response values such as warpage-deformation was analyzed, e.g., for warpage-deformation, the significance of repass consolidation parameters was RCS (83.23 %) > RCF (8.55 %) > RCT (8.22 %). It is shown that the oriented state of the molecular chain is a thermodynamic disequilibrium and that thermal motion will cause the oriented state structure to be auto-unoriented. The repass treatment promoted the deorientation behavior of the molecular chains, thus reducing the residual stresses and suppressing the warpage-deformation. This work validates the feasibility of repass treatment and inspires the inception and development of a potential optimization process for thermoplastic composites.