Synergistic regulation of carbon fiber orientation and mechanical anisotropy by the FGF shear flow field

This restricts their use in high-performance, multiaxial load-bearing structures and has become a major bottleneck in the development of FGF for high-end manufacturing. To overcome this challenge, a shear screw (SS) with integrated shear-inducing elements was developed.

Structural parameters were optimized using a simulation-experimental approach, allowing precise control of carbon fiber orientation. The results show that, compared to a conventional screw (CS), the SS promotes a helical carbon fiber orientation, significantly reducing mechanical property differences between orthogonal printing directions. The anisotropy index decreases from 0.46 to 0.16, showing a marked improvement in anisotropic properties.