Mechanical Performance of Bio-inspired Bidirectional Corrugated Sandwich Pressure Shell Under External Hydrostatic Pressure

作     者：ZHANG Yi CHEN Yue YUN Lai LIANG Xu ZHANG Yi;CHEN Yue;YUN Lai;LIANG Xu

作者机构：Ocean CollegeZhejiang UniversityZhoushan 316000China Hainan InstituteZhejiang UniversitySanya 572000China 

出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)

年 卷 期：2024年第38卷第2期

页      面：297-312页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 0824[工学-船舶与海洋工程] 0802[工学-机械工程] 0814[工学-土木工程] 082401[工学-船舶与海洋结构物设计制造] 

基　　金：financially supported by the National Key Research and Development Program of China(Grant No.2022YFB2602800) the National Natural Science Foundation of China(Grant Nos.51879231,51679214)。 

主　　题：bio-inspiration bidirectional corrugation sandwich shell external pressure buckling 

摘      要：This paper aims to enhance the compression capacity of underwater cylindrical shells by adopting the corrugated sandwich structure of cuttlebone.The cuttlebone suffers uniaxial external compression,while underwater cylindrical shells are in a biaxial compressive stress state.To suit the biaxial compressive stress state,a novel bidirectional corrugated sandwich structure is proposed to improve the bearing capacity of cylindrical shells.The static and buckling analysis for the sandwich shell and the unstiffened cylindrical shell with the same volume-weight ratio are studied by numerical simulation.It is indicated that the proposed sandwich shell can effectively reduce the ratio between circumferential and axial stress from 2 to 1.25 and improve the critical buckling load by about 1.63 times.Numerical simulation shows that optimizing and adjusting the structural parameters could significantly improve the advantage of the sandwich shell.Then,the hydrostatic pressure tests for shell models fabricated by 3D printing are carried out.According to the experimental results,the overall failure position of the sandwich shell is at the center part of the sandwich shell.It has been found the average critical load of the proposed sandwich shell models exceeds two times that of the unstiffened shell models.Hence,the proposed bio-inspired bidirectional corrugated sandwich structure can significantly enhance the pressure resistance capability of cylindrical shells.