Abstract
Circular honeycombs are extensively used to absorb impact energy considering its good energy absorption properties. Rather than focusing on the existing perfect honeycomb, effects of concentrated filling inclusions on the in-plane dynamic behavior of circular honeycomb structure are studied in detail by using finite element simulations. The crushing model of honeycomb under in-plane impact is established which then is used to investigate the influences of packing ratio, defect distribution area and impact velocity on the deformation mode and the plateau stress. Investigation results show that the deformation model of imperfect honeycomb can still be classified into three types: Quasi-static mode, transition mode and dynamic mode; However, the value of packing ratio and defect location may seriously influence localized deformed band of transition mode; The plateau stress of the honeycomb relies on the defect location except for the packing ratio; The filling inclusions defect concentrated in sub-region 2 is more beneficial to improve the energy-absorption capacity; Especially under middle or low impact velocities, it displays higher sensitivity; The crushing plateau stress of honeycomb with α = 0.36 and defect concentrated in sub-region 2 is even improved about 56.9 % under impact velocity 100 m/s. These results can provide valuable suggestions in the study and design of other honeycomb structures.
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Recommended by Associate Editor Kyeongsik Woo
Qiang He is currently an lecturer in School of Mechanical Engineering, Jiangsu University of Science and Technology in Zhenjiang City, Jiangsu. He obtained the B.S. from Xuzhou Institute of Technology, M.S. and Ph.D. from the Nanjing University of Science and Technology, all in Mechanical Engineering. His research interests include impact dynamics and mechanical properties of composites.
Jun Feng is an Assistant Professor of National Key Laboratory of Transient Physics at Nanjing University of Science and Technology (NJUST), Nanjing, China. He received his Ph.D. degree in Theoretical and Applied Mechanics from NJUST, during which he was a visiting scholar at Northwestern University (Evanston, IL, USA) in collaboration with Prof. Cusatis. Dr. Feng worked as a postdoctoral fellow at Institute of Industrial Science of The University of Tokyo (Japan) in collaboration with Prof. Yoshikawa. His current research focuses on multiscale/multi-physics modeling of composites with application to impact engineering.
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He, Q., Feng, J., Zhou, H. et al. Numerical study on the dynamic behavior of circular honeycomb structure with concentrated filling inclusions defects. J Mech Sci Technol 32, 3727–3735 (2018). https://doi.org/10.1007/s12206-018-0725-4
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DOI: https://doi.org/10.1007/s12206-018-0725-4