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Designing Electronic Structures of Multiscale Helical Converters for Tailored Ultrabroad Electromagnetic Absorption

Nano-Micro Letters 2025年第1期17卷 439-455页

作者： Zhaobo Feng Chongbo Liu Xin Li Guangsheng Luo Naixin Zhai Ruizhe Hu Jing Lin Jinbin Peng Yuhui Peng Renchao Che key laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle School of Environmental and Chemical EngineeringNanchang Hangkong UniversityNanchang 330063People’s Republic of China School of Physics and materials Nanchang UniversityNanchang 330031People’s Republic of China key laboratory of Nondestructive testing Ministry of EducationNanchang Hangkong UniversityNanchang 330063People’s Republic of China laboratory of Advanced materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering and TechnologyFudan UniversityShanghai 200438People’s Republic of China

Atomic-scale doping strategies and structure design play pivotal roles in tailoring the electronic structure and physicochemical property of electromagnetic wave absorption(EMWA)***,the relationship between configuration and electromagnetic(EM)loss mechanism has remained ***,drawing inspiration from the DNA transcription process,we report the successful synthesis of novel in situ Mn/N co-doped helical carbon nanotubes with ultrabroad EMWA *** calculation and EM simulation confirm that the orbital coupling and spin polarization of the Mn–N4–C configuration,along with cross polarization generated by the helical structure,endow the helical converters with enhanced EM *** a result,HMC-8 demonstrates outstanding EMWA performance,achieving a minimum reflection loss of−63.13 dB at an ultralow thickness of 1.29 *** precise tuning of the graphite domain size,HMC-7 achieves an effective absorption bandwidth(EAB)of 6.08 GHz at 2.02 mm ***,constructing macroscale gradient metamaterials enables an ultrabroadband EAB of 12.16 GHz at a thickness of only 5.00 mm,with the maximum radar cross section reduction value reaching 36.4 dB *** innovative approach not only advances the understanding of metal–nonmetal co-doping but also realizes broadband EMWA,thus contributing to the development of EMWA mechanisms and applications.

关键词： Metal-nonmetal co-doping 3d-2p orbital coupling Spin polarization Helical structure Broadband EM wave absorption

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evaluation of vibration stress of TA11 titanium alloy blade by quantitative fractography

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Rare Metals 2014年第3期33卷 263-269页

作者： Xin-Ling Liu Yuan-Ming Xu Chun-Hu Tao beijing Institute of aeronautical materials Aviation Industries of China key laboratory of aeronautical materials testing and evaluation ChinaTao Failure Analysis Center of Aviation Industries of China School of aeronautical Science and Engineering Beijing University of Aeronautics and Astronautics beijing key laboratory of aeronautical materials testing and evaluation

Vibration fatigue is the main failure mode of compressor blade. Evaluating the vibration stress of blade that leads to cracking is very useful for analysis of vibration fatigue. In this paper, fatigue stress estimation methods by quantitative fractography were studied through experimental blade and in-service first-stage compressor blade in order to evaluate the initiation vibration stress of in-service blade. The analysis process of initiation vibration stress was established. The evaluating result of vibration stress of in-service blade subjected to centrifugal force and bending vibration stress agrees with aero engine test result. It is shown that the evaluation method can not only evaluate the equivalent fatigue stresses of different crack depths but also yield the initiation equivalent fatigue stress.

关键词： Compressor blade Bending vibration Stress evaluate Quantitative fractography

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Hygrothermal and temperature effects on load-carrying capacity and failure mechanism of open-hole laminates prepared with narrow tape prepreg of GFRP

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Progress in Natural Science:materials International 2022年第3期32卷 392-399页

作者： Yana Wang Xiang Wang Wei Zhao Yuhuai He aeronautical Material testing Research Center AECC Beijing Institute of Aeronautical Materials beijing key laboratory of aeronautical Material testing and evaluation key laboratory of aeronautical Material testing and evaluation Aero Engine Corporation of China School of Astronautics Beihang University

The tensile and compressive properties of the open-hole laminates fabricated with glass fiber reinforced polymer(GFRP) under various temperature/humidity coupled conditions are important design parameters for GFRP structures in helicopter. In current work, a comprehensive experimental study about the effects of temperature and hygrothermal on the open-hole mechanical property of HS6/AC318 glass/epoxy multidirectional laminates was conducted. The load-displacement responses, fracture morphologies and failure mechanisms of quasiisotropic GFRP laminates with a center hole under tensile and compressive loads at the five environmental conditions were compared, and the effects of the temperature and hygrothermal on the open-hole tensile(OHL)strengths and open-hole compressive(OHC) strengths of GFRP laminates were investigated. In addition, the relevancies between the OHL and OHC strength of open-hole laminates and the basic material properties of unidirectional laminates were explored, and some links between the OHL strength and interlaminar fracture toughness were found. The results showed that the OHC strength of open-hole laminates was directly proportional to the 0° compressive strength of unidirectional laminates. Based on the experimental data and analysis an empirical formula of the OHC strength at arbitrary temperature and humidity combined conditions was proposed.

关键词： GFRP Open-hole compression Open-hole tension Hygrothermal effect Experiments

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Characterization of creep behavior of TiAl alloy with high Nb content at elevated temperatures

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Rare Metals 2016年第1期35卷 106-112页

作者： Cheng-Li Dong Hui-Chen Yu Ze-Hui Jiao beijing key laboratory of aeronautical materials testing and evaluation Science and Technology on Advanced High Temperature Structural Materials LaboratoryBeijing Institute of Aeronautical Materials Science and Technology on Advanced High Temperature Structural materials laboratory Beijing Institute of Aeronautical Materials

Creep experiments of the TiAl alloy with high Nb content were conducted to consider both the temperature dependence and stress dependence of its creep *** creep curves were characterized by Theta constitutive model,and Newton-Gauss method was applied to obtain the material *** on the rupture strain,the rupture life of the TiAl alloy was able to be predicted by Theta constitutive *** results show that the creep curves of the TiAl alloy contain primary creep,secondary creep and tertiary creep stages,especially for the lower *** rupture life of the TiAl alloy decreases with the increase in either applied stress or *** constitutive model is able to describe the creep deformation of the TiAl alloy accurately,and the predicted life agrees well with the experimental result.

关键词： TiAl alloy Creep Rupture Life prediction Theta constitutive model

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Fatigue crack propagation behavior of Ni-based superalloys after overloading at elevated temperatures

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Progress in Natural Science:materials International 2016年第2期26卷 197-203页

作者： Xinyue Huang Liang Wang Yunming Hu Guangping Guo David Salmon Ying Li Wenxia Zhao National key laboratory of Science and Technology on Advanced High Temperature Structural materials Beijing Institute of Aeronautical Materials MTS Systems Corporation Eden Prairie 3. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing Institute of Aeronautical Materials

The fatigue crack propagation behavior of three superalloys subjected to a single overloading at elevated temperatures was investigated. The fatigue crack propagation rate FCPR versus stress intensity factor range data da/dN—ΔK were calculated using the two-point secant method. It was found that the crack growth rates of the investigated materials were retarded after overloading with an overload ratio R OL=1.6. The size of the plastic zone in the front of the crack tip and its relation to loading level were discussed. The overload retardation effects are attributed to crack closure. The fatigue damage in the plastic zone can also be a factor to explain the overload retardation.

关键词： High temperature fatigue Fatigue crack propagation rate Overloading Crack closure Superalloys

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Fatigue small crack growth threshold determination of a high-Nb TiAl alloy at different temperatures by in-situ observation

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International Journal of Minerals,Metallurgy and materials 2013年第12期20卷 1192-1197页

作者： Min Zhang Xi-ping Song Long Yu Hong-liang Li Ze-hui Jiao Hui-chen Yu State key laboratory for Advanced Metals and materials University of Science and Technology Beijing testing Research Center for aeronautical materials Beijing Institute of Aeronautical Materials

The purpose of this paper is to estimate the fatigue crack growth threshold of a high-Nb TiAl alloy at the different temperatures based on scanning electron microscopy （SEM） in-situ observation. The results indicated that the fatigue crack growth threshold △Kth of a nearly lamellar high-Nb TiAl alloy with 8% Nb content at room temperature and 750℃ was determined as 12.89 MPa.m^1/2 and 8.69 MPa.m^1/2, respectively. The effect of the elevated temperature on the fatigue crack growth threshold cannot be ignored. At the same time, the early stage of fatigue crack propagation exhibited multicrack initiation and bridge-link behavior.

关键词： titanium aluminum alloys niobium fatigue crack propagation high temperature testing

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Creep behavior and effect factors of a TiAl–Nb alloy at high temperature

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Progress in Natural Science:materials International 2021年第3期31卷 477-485页

作者： Shunke Zhang Sugui Tian Gengyu Li Ning Tian Fangwei Jin Huichen Yu Xiaoxia Lv Guangyan Wang Deyuan Li Shenyang University of Technology Guizhou University of Engineering Science beijing key laboratory of aeronautical materials testing and evaluation Science and Technology on Advanced High Temperature Structural Materials Laboratory AVIC Beijing Institute of Aeronautical Materials

The effect of solution treatment on the microstructure and creep properties of forged TiAl-Nb alloys was *** results showed that the microstructure of forged alloy mainly consisted of γ/αlamellar colonies and fine equiaxed recrystallized γ/α*** the solution treatment the microstructure of the alloy transformed into a fully lamellar structure due to the lamellar colonies growth by consuming equiaxed *** with the forged alloy the creep life of the solution treated alloy at 800℃/220 MPa increased from 116 h to 339 *** better creep resistance may be attributed to the transform of fine equiaxed γ/αgrain to the lamellar colonies with serrated grain boundaries due to the solution *** deformation mechanism of the solution treated alloy during creep is considered to be dislocation slipping within the lamellar γ/αphases,and the dislocation movement may be hindered by the γ/αinterface and the formation of dislocation *** interaction of the dislocations with the tangles may increase the resistance of the dislocation motion and hence improve the creep resistance of the *** was found that during the creep of the forged alloys the cracks mainly initiated at the equiaxed grain,and in the solution treated alloy the cracks initiated at the grain *** creep continued the cracks propagated and connected to each other,leading to the damage and rupture of the forged and solution treated alloys.

关键词： Forged TiAl–Nb alloy Solution treatment Microstructure Creep Deformation and damage

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Influence of Temperature on Stacking Fault Energy and Creep Mechanism of a Single Crystal Nickel-based Superalloy

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Journal of materials Science & Technology 2016年第8期32卷 790-798页

作者： Sugui Tian Xinjie Zhu Jing Wu Huichen Yu Delong Shu Benjiang Qian Shenyang University of Technology Shenyang 110870 China Aviation key laboratory of Science and Technology on materials testing and evaluation Science and Technology on Advanced High TemperatureStructural Materials Laboratory Beijing Institute of Aeronautical Materials Beijing 100095 China

The influence of temperatures on the stacking fault energies and deformation mechanism of a Re- containing single crystal nickel-based superalloy during creep at elevated temperatures was investigated by means of calculating the stacking fault energy of alloy, measuring creep properties and performing contrast analysis of dislocation configuration. The results show that the alloy at 760 ℃ possesses lower stacking fault energy, and the stacking fault of alloy increases with increasing temperature. The defor- mation mechanism of alloy during creep at 760 ℃ is 7＇ phase sheared by 〈110〉 super-dislocations, which may be decomposed to form the configuration of Shockley partials plus super-lattice intrinsic stacking fault, while the deformation mechanism of alloy during creep at 1070 ℃ is the screw or edge super- dislocations shearing into the rafted 7＇ phase. But during creep at 7（50 and 980 ℃, some super- dislocations shearing into 7＇ phase may cross-slip from the {111} to {100} planes to form the K-W locks with non-plane core structure, which may restrain the dislocations slipping to enhance the creep resis- tance of alloy at high temperature. The interaction between the Re and other elements may decrease the diffusion rate of atoms to improve the microstructure stability, which is thought to be the main reason why the K-W locks are to be kept in the Re-containing superalloy during creep at 980 ℃.

关键词： Single crystal nickel-based superalloy Stacking fault energy Creep Contrast analysis Deformation mechanism

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A Ply-By-Ply Discretized 2D FEA Approach with the Integrated XFEM-CE Strategy for Predicting Multiple Failures in Laminated Composite Structures

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Computer Modeling in Engineering & Sciences 2019年第7期120卷 215-234页

作者： Yana Wang Ruodi Jia Fengrui Liu School of Astronautics Beihang UniversityBeijing100191China aeronautical Material testing Research Center AECC Beijing Institute of Aeronautical MaterialsBeijing100095China beijing key laboratory of aeronautical Material testing and evaluation Beijing100095China key laboratory of aeronautical Material testing and evaluation Aero Engine Corporation of ChinaBeijing100095China key laboratory of Spacecraft Design Optimization and Dynamic Simulation Technologies Minisitry of EducationBeihang UniversityBeijing100191China State key laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong UniversityXi’an710049China.

Delamination and matrix cracking are two common failure mechanisms in composite structures,and are usually coupled with each other,leading to multiple failures *** paper proposed a fast damage prediction methodology for composite laminated structures based on the ply-by-ply 2D(two dimensional)FE model of composite laminates in the transverse *** layer-wise 2D FE model was firstly used in conjunction with the integrated XFEM/CE strategy,which simulated the interface delamination with cohesive elements and the intra-ply matrix crack with XFEM(extended finite element method).To realize ply-by-ply 2D FE(finite element)modeling of composite laminates,two 2D material models were developed based on the plane stress assumption and plane strain assumption,respectively.A general crack propagation scheme was developed in the framework of the integrated XFEM-CE *** the 2D material model based on the plane strain assumption,a ply-by-ply discretized 2D FEA procedure was conducted for an out-of-plane composite Pi joint under the static tensile *** predicted load-displacement response and damage evolution process showed good agreement with the experimental results,which verified the proposed approach.

关键词： Composites laminate strength finite element analysis

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Deformation and damage behaviors of as-cast TiAl-Nb alloy during creep

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Progress in Natural Science:materials International 2018年第5期28卷 618-625页

作者： Shunke Zhang Sugui Tian Xiaoxia Lv Huichen Yu Ning Tian Zehui Jiao Guoqi Zhao Deyuan Li Guizhou University of Engineering Science Shenyang University of Technology AECC key laboratory of Science and Technology on materials testing and evaluation National Key Laboratory of Science and Technology on Advanced High Temperature Structure Materials AECC Beijing Institute of Aeronautical Materials

By means of creep properties measurement and microstructure observation,the deformation and damage behavior of an as-cast TiAl-Nb alloy during creep at temperature near 750°C were *** results showed that the microstructure of the alloy consisted of lamellarγ/α;phase,and the boundaries consisted ofγphase located in between lamellarγ/α;phases with different *** the latter stage of creep,the dislocation networks appeared in the interfaces of lamellarγ/α;phases due to the coarsening of them,which made the coherent interface transforming into the semi-coherent one for reducing its adhesive *** deformation mechanism of the alloy during creep was twinning and dislocations slipping within lamellarγ/α;*** the later period of creep,significant amount of dislocations plied up in the interfaces of lamellarγ/α;phases,which may cause the stress concentration to promote the initiation and propagation of the cracks along the lamellarγ/α;interfaces perpendicular to the stress ***,some cracks on the various cross-sections were connected by tearing edge along the direction of maximum shear stress,up to the creep fracture,which is considered to be the damage and fracture mechanism of alloy during creep at 750°C.

关键词： TiAl-Nb alloy Creep Dislocation network Deformation mechanism Fracture mechanism

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