The Quasi-static Compressive Mechanical Properties Of Barnacle Bioinspired Structures

With the development of industrialization,the demand for lightweight structures with high energy absorption performance is also increasing in various fields.Therefore,the light structure with excellent energy absorption performance can protect the development of aerospace,transportation,civil engineering and other fields.Natural organisms optimize their structures many times after the survival of the fittest.Inspired by nature,researchers design novel structures that are better than traditional structures by imitating the external outline and internal structure of natural organisms.Therefore,this paper continues the research hotspot of bioinspired structure and designs a new lightweight structure with excellent energy absorption performance by using the bio-inspired method.This paper designs bioinspired thin-walled structures based on observations of barnacles and studies the mechanical properties of these structures under quasi-static conditions.The effects of the number of corrugations and the corrugation amplitudes on the structural deformation and energy absorption performance of 3D printed bioinspired tapered tubes are studied experimentally,numerically,and theoretically.The results show that the corrugation amplitude and the number of corrugations have a significant influence on the energy absorption parameters,and the specific energy absorption(SEA)can be significantly improved when the number and amplitude of the corrugations are properly controlled.The highest SEA of the corrugated tapered tube can be improved by 15.75% compared with the traditional tapered tube.Furthermore,the crashworthiness of the corrugated tapered tubes under oblique loads is also investigated.The result shows that the SEA of the corrugated tapered tube is 41.56% higher than that of the cylindrical tube when the oblique loading angle is 20?.In addition,the energy absorption performance of the multicell structures is studied,and they perform much better than conventional structures.Especially,the SEA of the multicell tapered tube with 16 cells is approximately 1.97 times that of conventional tube.Finally,this paper also studies the energy absorption characteristics of the two hierarchical structures.The influence of two parameters,the number of substructures and the ratio of wall thickness,on the energy absorption performance of the structure is respectively studied.The results show that the energy absorption effect of the HTT structure is improved with the increase of the number of substructures.The study on the ratio of inner and outer wall thickness of corrugated stratum structure(HCTT)with4 substructures shows that EA,SEA,MCF and CFE decrease with the increase of λ,and Fp increases with the increase of λ.When λ=0.4,the HCTT structure has the highest SEA(40.87 k J/kg)and CFE(85.45%),which is an economical and practical biomimetic energy absorption structure design.