Optimization design of chiral hexagonal honeycombs with prescribed elastic properties under large deformation  

作　　者：Kepeng QIU Ruoyao WANG Jihong ZHU Weihong ZHANG 

机构地区：[1]School of Mechanical Engineering,Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Chinese Journal of Aeronautics》2020年第3期902-909,共8页中国航空学报（英文版）

基　　金：National Key Research and Development Program(2017YFB1102800);NSFC for Excellent Young Scholars(11722219);National Natural Science Foundation of China(11772258,51790171,5171101743)。

摘　　要：Flexible chiral honeycomb cores generally exhibit nonlinear elastic properties due to large geometric deformation.The effective elastic moduli and Poisson's ratio typically vary with an increase in deformation.Here,the size and shape optimization of the chiral hexagonal honeycombs was performed to keep the Young's moduli and Poisson's ratio unchanged under large deformations.The size of the honeycomb unit cell and the position coordinates of the key points were defined simultaneously as design variables.The equivalent Young's modulus and Poisson's ratio of chiral honeycombs were calculated through geometric nonlinear analysis.The objective was to minimize the allowable tolerance between the prescribed and actual properties within the range of the target strain.A genetic algorithm was then adopted.The optimal results demonstrate that the chiral honeycombs can maintain effective elastic properties that do not vary under large deformation.These results are meaningful to morphing aircraft designs.

关 键 词：Chiral hexagonal honeycombs Genetic algorithm Geometric nonlinearity Large deformation Shape optimization 

分 类 号：V214.1[航空宇航科学与技术—航空宇航推进理论与工程]