Bioinspired Bouligand‐Sandwich Hybrid: Enhanced Mechanical Performance in Wood Fiber‐Reinforced Composites

ABSTRACT Natural fiber‐reinforced composites (NFRCs) have garnered significant attention owing to their biodegradability and renewability, yet their mechanical properties remain suboptimal. Current reinforcement designs primarily incorporate bionic sandwich structures and Bouligand structures, with single bionic structures approaching the upper limit of their reinforcement efficacy. This study proposes a hybrid approach combining Bouligand and sandwich structures to fabricate wood fiber‐reinforced composites, synergistically integrating the lightweight and high‐strength advantages of sandwich structures with the crack deflection mechanism of helical arrangements. The effects of various hybridization strategies on flexural and impact properties were systematically investigated, along with the enhancement mechanisms of hybrid structures and composite performance under extreme environmental conditions. Results indicate that the reinforced structure attains a bending strength of 289.08 MPa and a flexural modulus of 36.16 GPa, representing 1.42‐fold and 5.36‐fold improvements over conventional wood fiber‐reinforced composites, respectively. The impact energy absorption capacity reaches 3.04 J/mm, surpassing that of single bionic structures. Additionally, the composite maintains exceptional mechanical stability under extreme conditions. These superior characteristics establish the developed composite as a sustainable alternative for aerospace applications, personal protective equipment, and other impact‐resistant applications. Furthermore, this research provides a novel design paradigm for enhancing the performance of fiber‐reinforced composites.