• • Wet twisting of continuous carbon fiber (CCF) significantly enhances mechanical properties of CCF/PLA/PVDF composites, with failure mode shifting from fiber pull-out to characteristic fiber breakage, indicating improved interfacial adhesion.
• • The optimized G-code and contour bias path redirect force distribution, enabling effective utilization of CCF properties in 3D-printed structures.
• • Abaqus simulations confirm the deformation process and energy absorption mechanisms of the CCFRTP cosine beam structure, validating its feasibility for energy-absorbing applications.
• • The double-cell array configuration validates the negative stiffness honeycomb structure's potential for large deformation energy absorption, with performance strongly influenced by interface properties and structural parameters.