Bio-inspired jigsaw-interlocking suture interfaces for enhanced flexural response of 3D-printed strain-hardening cementitious composites (3DP-SHCC)

作者：Shiping Li, Yan Sun, Qian Ye, Wujun Chen, Daxu Zhang, Xiaoniu Yu · 发表于：Cement and Concrete Composites · 年份：2025 · DOI：10.1016/j.cemconcomp.2025.106395 · 被引用次数：6 · 研究领域：Calcium Carbonate Crystallization and Inhibition、Innovations in Concrete and Construction Materials、Adhesion, Friction, and Surface Interactions

The natural jigsaw-interlocking suture interfaces of the exoskeletal forewings (elytra) of the diabolical ironclad beetle, Phloeodes diabolicus , exhibit excellent mechanical response, enabling efficient load transfer and energy dissipation. Inspired by these natural jigsaw-interlocking suture interfaces, a groove structure with prefabricated interlocking sutures in 3D-printed Strain-Hardening Cementitious Composites (3DP-SHCC) was systematically studied to investigate the influence of suture geometries on load transfer efficiency, crack propagation paths, and failure modes, revealing the unique energy dissipation mechanism and exceptional deformation capacity of the jigsaw-interlocking suture. Experimental results show that bio-inspired jigsaw-interlocking sutures can significantly enhance flexural strength and energy dissipation, and delay suture interface failure through an interlocking mechanism. The optimized suture geometries (engagement angle = 25°; elliptical aspect ratio = 1.8) achieve synergistic optimization of flexural strength, ductility, and energy dissipation. Compared with its cast unjointed counterpart, specimen Y-A 25° G 1.8 retained 97.2% of the flexural strength and 94.0% of the total energy dissipation, indicating comparable mechanical performance without supplementary reinforcement. These findings challenge the conventional assumption that joints inherently compromise mechanical performance. The suture interface with nonlinear mechanical response provide...