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International Journal of Automotive Technology > Volume 24(5); 2023 > Article
International Journal of Automotive Technology 2023;24(5): 1285-1303.
doi: https://doi.org/10.1007/s12239-023-0104-8
IN-PLANE DYNAMICS CHARACTERISTICS AND MULTI-OBJECTIVE OPTIMIZATION OF NEGATIVE POISSON’S RATIO HONEYCOMB STRUCTURE WITH POWER FUNCTION CURVE
Yifan Zhu 1,2, Fengxiang Xu 1,2, Yijie Guan 1,2, Zhen Zou 1,2, Libin Duan 3, Zhanpeng Du 3, Hongfeng Ma 4
1Hubei Key Laboratory of Advanced Technology of Automotive Components, Wuhan University of Technology
2Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology
3Institute of Lightweight and Safety of New Energy Vehicle, School of Automotive and Traffic Engineering, Jiangsu University
4Jiangsu XCMG State Key Laboratory Technology Co., Ltd.
PDF Links Corresponding Author.  Fengxiang Xu  , Email. xufx@whut.edu.cn
ABSTRACT
As an alternative to the conventional concave hexagonal honeycomb structure (CHHS), a negative Poisson’s ratio honeycomb structure with power function curve (NHPC) was devised. The relationship between the power function exponent (PFE) and normalized power function coefficient (NPFC) of honeycomb structure and its equivalent Poisson’s ratio (EPR) was explored to identify the range of variables required for the negative Poisson’s ratio effect. To investigate the in-plane mechanical properties and energy absorption characteristics of NHPC, the deformation mode, dynamic response, and energy absorption characteristics under various impact velocities were studied by constructing an in-plane impact simulation model. The results showed that NHPC obviously exhibited a negative Poisson’s ratio effect on medium and low impact velocities, and the deformation was primarily uniform. As the NPFC increased, the honeycomb structure was less prone to stress concentration, while the peak crushing force (PCF) and the specific energy absorption (SEA) declined and the plateau stress increased. A multi-objective optimization experiment was operated with low PCF and high SEA as the targets within the range of design variables in order to generate the optimal NHPC. According to the experimental findings, the improved NHPC showed a 25.48 % reduction in PCF and a 19.29 % increase in SEA. This paper provides theoretical recommendations for improving the energy absorption and structural optimization of the honeycomb structure.
Key Words: Power function, Negative Poisson’s ratio, Honeycomb structure, In-plane impact, Energy absorption
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