Bark‐Fissure‐Inspired Lattice Metamaterials for Concurrent Enhancement of Mechanical and Mass Transport Properties

ABSTRACT Lattice metamaterials have emerged as a promising class of architected materials due to their ability to tailor mechanical and transport properties through geometric design. However, conventional lattices face a trade‐off between mechanical robustness and fluid transport, arising from the inverse dependence of elastic modulus and permeability on relative density. This severely restricts multifunctional applications such as bone scaffolds. Inspired by the collaborative and adaptive regulation mechanism of bark fissures in nature, we propose a lattice design strategy to significantly enhance parametric design flexibility. Using the classical shell‐based Gyroid‐type lattice as a model, this strategy yields a bark‐fissure‐inspired architecture featuring three spatially independent pore channels. Through rational anisotropic unit cell design, this strategy achieves a concurrent enhancement in mechanical and mass transport properties at a constant relative density. Computational results demonstrate that the fissure size dictates the upper and lower limits of performance by modulating material distribution and channel dimensions, while crystal orientation and rotation angle of the unit cell enable the precise and independent tuning of multiple properties by optimizing stress distribution and fluid transport pathways. This strategy establishes a versatile framework for the concurrent regulation of functionalities in lattice metamaterials, with promising applications in biomedical implants, catalyst supports, and other multifunctional systems.