Application of Double-Double laminate concept in optimized design of PRSEUS structure

The Pultruded Rod Stitched Efficient Unitized Structure (PRSEUS) proposed by NASA provides a viable pathway for all-composite aircraft. Nonetheless, its reliance on the traditional [0°/±45°/90°] quad-layer system curtails the overall optimization potential. Traditional design approaches depend heavily on empirical testing and localized reinforcement, complicating optimization efforts and frequently resulting in structural thickening, increased weight, and elevated costs. To address these challenges, this study introduces a novel Double-Double (DD) laminate system to evaluate its feasibility as a replacement for traditional laminates, while conducting synergistic optimization of laminate angle and thickness. This study demonstrates that the DD laminate system not only fulfills the functionality of traditional laminates but also streamlines the optimization process, enhancing mechanical properties while reducing weight. The PRSEUS structure based on the DD laminate holds promise as an optimal solution for next-generation aircraft composite material design, thereby broadening the application prospects of high-performance composites in the aerospace field.