Mantis shrimps deliver one of the fastest strikes with their powerful dactyl clubs. The kinematic energy derived by a saddle storing and releasing mechanical energy with large deformation. As an exoskeleton, the toughness of saddles can achieve a remarkable value ≈15.28 ± 2.32 MJ m −3 , which exceeds most bulk natural materials. The excellent toughness of saddles is mainly attributed to the synergy of the helical mineralized fiber architectures and interlaminar fibrils. The interlaminar fibrils connect adjacent mineralized fiber layers closely, enhancing the toughness through viscoelastic deformation during sliding and separating of adjacent layers. They further cooperate with rigid interlacing fiber structure induced by helical structure to transform little normal strain to large shear strain utilizing incompressibility of soft fibrils further to enhance strain energy for toughening. Inspired by unique laminated saddles, the laminate composites are designed with basalt fabrics achieving remarkable fracture toughness to solve the problem of delamination in traditional laminate composites with poor interlaminar toughness. The Mode I and Mode II interlaminar fracture toughness of bio-inspired laminate composites respectively increase by 44% and 118% reaching 906.8 and 1394.6 J m −2 , which provides an innovative bionic strategy for designing new generation structural engineering materials with excellent mechanical properties.
Bo Wang,Dagang Wang,Liang Tang,Hailang Chong,Wei Xu,Xinxin Zhang,Chunlei Zhang,Dianlong Tan,Xia Zhao,Dekun Zhang,Shirong Ge
The coupling effect of dead load, vehicle load, wind load and corrosive environment in the main saddle causes bending tribo-corrosion-fatigue behaviors between the wires and the saddle material in the suspension bridge . A self-made wire test rig was developed for the bending tribo-corrosion-fatigue test between the wire and saddle material in 3.5% NaCl solution and ultrapure water. The tribological properties (friction coefficient, wear mechanism, wear profile, volume loss, etc.), electrochemical corrosion behaviors (Tafel polarization curve , Nyquist diagram) and effect of fatigue load were revealed. The interaction of tribo-corrosion-fatigue was quantitatively analyzed by different types of volume loss, and its mechanism was discussed. The results demonstrated that a synergy of the three becomes more significant with the increasing fatigue load.
危险品化学品经营许可证（带存储）