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Crashworthiness of innovative hexagonal honeycomb-like structures subjected to out-of-plane compression

Journal of Central South University 2020年第2期27卷 621-628页

作者： WANG Zhong-gang SHI Chong DING San-san LIANG Xi-feng CRRC Qingdao Sifang Co. Ltd.Qingdao 266111China Key Laboratory of Traffic Safety on Track(Ministry of Education) School of Traffic and Transportation EngineeringCentral South UniversityChangsha 410075China

Seeking for innovative structures with higher mechanical performance is a continuous target in railway vehicle crashworthiness *** the present study,three types of hexagonal reinforced honeycomb-like structures were developed and analyzed subjected to out-of-plane compression,namely triangular honeycomb(TH),double honeycomb(DH)and full inside honeycomb(FH).Theoretical formulas of average force and specific energy absorption(SEA)were constructed based on the energy minimization *** validate,corresponding numerical simulations were carried out by explicit finite element *** agreement has been observed between *** results show that all these honeycomb-like structures maintain the same collapsed stages as conventional honeycomb;cell reinforcement can significantly promote the performance,both in the average force and SEA;full inside honeycomb performs better than the general,triangular and double schemes in average force;meanwhile,its SEA is close to that of double scheme;toroidal surface can dissipate higher plastic energy,so more toroidal surfaces should be considered in design of thin-walled *** achievements pave a way for designing high-performance cellular energy absorption devices.

关键词： honeycomb-like structure crashworthiness basic fold element structural reinforcement

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Enhanced interfacial polarization of defective porous carbon confined CoP nanoparticles forming Mott-Schottky heterojunction for efficient electromagnetic wave absorption

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Nano Research 2023年第3期16卷 4160-4169页

作者： Baojun Wang Fangzhi Huang Hao Wu Zijie Xu Shipeng Wang Qinghua Han Fenghua Liu Shikuo Li Hui Zhang School of Materials Science and Engineering Anhui UniversityHefei 230601China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Ningbo Institute of Materials Technology and Engineering Chinese Academy of ScienceNingbo 315201China Key Laboratory of structure and Functional Regulation of Hybrid Materials(Anhui University) Ministry of EducationHefei 230601China

Integrating heterogeneous interface through nanostructure design and interfacial modification is essential to realize strengthened interfacial polarization relaxation in electromagnetic wave ***,an in-depth comprehension of the interfacial polarization behavior at hetero-junction/interface is highly desired but remains a great ***,a Mott-Schottky heterojunction consisting of honeycomb-like porous N-doped carbon confined CoP nanoparticles(CoP@HNC)is designed to elevate the interfacial polarization ***,corresponding electron migration and redistribution between the heterointerface of defective carbon and CoP nanoparticles are *** significant difference in the work function on both sides of heterogeneous interface boosts the interfacial polarization in high frequency ***,the relevant spectroscopic characterizations demonstrate that electron spontaneously migrates from CoP to N-doped carbon at the heterointerface,thereby contributing to the accumulation of electron on defective carbon side and the distribution of hole on CoP ***,benefitting from the synergistic effects of three-dimensional porous conductive carbon skeleton,foreign N heteroatoms,special CoP nanoparticles,and the resultant CoP/N-doped carbon Mott-Schottky heterojunction,the CoP@HNC exhibits remarkable electromagnetic wave absorption performances with minimum reflection loss up to−60.8 dB and the maximum effective absorption bandwidth of 4.96 GHz,which is superior to most of recently reported transition metal phosphides microwave absorbing *** present work opens a new avenue for designing heterogeneous interface to realize strengthened microwave absorption capability and also reveals the in-depth influence of interface structure on electromagnetic wave absorption.

关键词： honeycomb-like structure Mott-Schottky heterojunction interfacial polarization electron transfer microwave absorption

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