Optimization of Geometric Parameters of Hexagonal Chiral Structure Based on Orthogonal Experiment

Liu Guoyong, Hou Yongtao, Ye Xuesong, He Guohui, Zhu Dongmei


 In view of the fact that the traditional materials used in the present chiral structures do not possess the ability of self-recovery after large deformation, a metallic material with in-plane unfolding and folding capability was proposed for the chiral structures of six ligaments. The influences of four factors,including the node spacing,the node diameter,the node height and the ligament thickness,on the maximum stress of the hexagonal ligament chiral structure after folding and unfolding were analyzed by finite element method. Taking the maximum stress after unfolding as the index,the effect of each factor was analyzed by orthogonal experiment. The order of influence is the node spacing,the ligament thickness,the node height and the node diameter. As a result,a set of optimal parameters can be obtained by range analysis and variance analysis,namely,the node height 8 mm,the node spacing 70 mm,the ligament thickness 0.06 mm,and the node diameter 22 mm. Meanwhile,the reliability of the simulation model was verified and the chiral structure has the ability of self-recovery after large deformation by experiments.



Keywords: deployable and folding,  six ligaments,  chirality,  large deformation,  orthogonal experiment

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