Hybrid Bionic Design Based on the Internal Structures of Nacre and Strombus Gigas Shell

Hybrid biomimetic structure design, which integrates the internal structure of a variety of biomaterials, is a new strategy for strengthening and toughening materials in recent years. In this work, carbon fiber reinforced epoxy resin was used to design a new type of “staggered-crossed” composite structure material, which is composed of the “interleaved” structure of nacre shell and the “crossed” structure of strombus shell. Through experimental and theoretical research, it was found that there is a significant difference between the “interleaved” structure of nacre and the “crossed” structure of strombus in the internal load transfer and stress distribution regulation. A simple hybrid mix of the two will produce adverse factors such as local stress concentration and lead to material performance degradation. On this basis, a new type of small angle continuous fiber “crossed” layered biomimetic structure was proposed by further optimizing the composite structure. This structure can optimize the full field stress distribution inside the material, suppress local stress concentration, and form a toughening mechanism that delays the overall structural fracture failure, effectively solving the problem of material performance degradation. The research results are expected to provide a useful reference for solving the contradiction between strength and toughness of materials.