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Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 311-324页

作者： Qian Yin Fan Wen Zhigang Tao Hai Pu Tianci Deng Yaoyao Meng Qingbin Meng Hongwen Jing Bo Meng Jiangyu Wu State key laboratory of Intelligent Construction and healthy Operation and maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China State key laboratory of Mining Response and Disaster prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China State key laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China key laboratory of Xinjiang Coal Resources Green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China

The mechanical behavior of cemented gangue backfill materials(CGBMs)is closely related to particle size distribution(PSD)of aggregates and properties of cementitious ***,the true triaxial compression tests,CT scanning,SEM,and EDS tests were conducted on cemented gangue backfill samples(CGBSs)with various carbon nanotube concentrations(P_(CNT))that satisfied fractal theory for the PSD of *** mechanical properties,energy dissipations,and failure mechanisms of the CGBSs under true triaxial compression were systematically *** results indicate that appropriate carbon nanotubes(CNTs)effectively enhance the mechanical properties and energy dissipations of CGBSs through micropore filling and microcrack bridging,and the optimal effect appears at P_(CNT)of 0.08wt%.Taking PSD fractal dimension(D)of 2.500 as an example,compared to that of CGBS without CNT,the peak strength(σ_(p)),axial peak strain(ε_(1,p)),elastic strain energy(Ue),and dissipated energy(U_(d))increased by 12.76%,29.60%,19.05%,and90.39%,***,excessive CNTs can reduce the mechanical properties of CGBSs due to CNT agglomeration,manifesting a decrease inρ_(p),ε_(1,p),and the volumetric strain increment(Δε_(v))when P_(CNT)increases from 0.08wt%to 0.12wt%.Moreover,the addition of CNTs improved the integrity of CGBS after macroscopic failure,and crack extension in CGBSs appeared in two modes:detour and pass through the ***σ_(p)and U_(d)firstly increase and then decrease with increasing D,and porosity shows the opposite ***ε_(1,p)andΔε_(v)are negatively correlated with D,and CGBS with D=2.150 has the maximum deformation parameters(ε_(1,p)=0.05079,Δε_(v)=0.01990)due to the frictional slip effect caused by coarse *** increasing D,the failure modes of CGBSs are sequentially manifested as oblique shear failure,"Y-shaped"shear failure,and conjugate shear failure.

关键词： cemented gangue backfill materials particle size distribution true triaxial compression test carbon nanotubes mechanical properties failure modes

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A Fault Feature Extraction Model in Synchronous Generator under Stator Inter-Turn Short Circuit Based on ACMD and DEO3S

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Structural Durability & health Monitoring 2023年第2期17卷 115-130页

作者： Yuling He Shuai Li Chao Zhang Xiaolong Wang Department of Mechanical Engineering and also the Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure PreventionNorth China Electric Power UniversityBaoding071003China

This paper proposed a new diagnosis model for the stator inter-turn short circuit fault in synchronous *** from the past methods focused on the current or voltage signals to diagnose the electrical fault,the sta-tor vibration signal analysis based on ACMD(adaptive chirp mode decomposition)and DEO3S(demodulation energy operator of symmetrical differencing)was adopted to extract the fault ***,FT(Fourier trans-form)is applied to the vibration signal to obtain the instantaneous frequency,and PE(permutation entropy)is calculated to select the proper weighting coefﬁ***,the signal is decomposed by ACMD,with the instan-taneous frequency and weighting coefﬁcient acquired in the former step to obtain the optimal ***,DEO3S is operated to get the envelope spectrum which is able to strengthen the characteristic frequencies of the stator inter-turn short circuit *** study on the simulating signal and the real experiment data indicates the effectiveness of the proposed method for the stator inter-turn short circuit fault in synchronous *** addition,the comparison with other methods shows the superiority of the proposed model.

关键词： Synchronous generator stator inter-turn short circuit vibration signal processing adaptive chirp mode decomposition demodulation energy operator of symmetrical differencing

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A Robust Superhydrophobic Smart Coating with Reversible Thermochromic and Photochromic Property

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Journal of Bionic Engineering 2022年第6期19卷 1589-1600页

作者： Peng Wang Xuesong Zhang Zhihao Wang Tao Chen Honglian Zhang Wei Duan Huilong Han School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBaoding071000China hebei key laboratory of electric machinery health maintenance and failure prevention North China Electric Power UniversityBaoding071003China

Both thermochromic and photochromic coating have attracted many attentions due to their widely applications,but the low stability is a big *** by the lotus leaf,to endow the chromic coating with superhydrophobicity is a possible *** this research,a dual response coating was prepared by adding photochromic and thermochromic particles *** prepared sample demonstrated at least four-state color switching,which can be successfully used in tactile imaging,multi-color fabric,erasable record,and security *** superhydrophobicity was achieved by introducing vinyl-terminated polydimethylsiloxane,which not only offers low surface energy but also can cross-link with the particles to increase the ***,the prepared sample maintained superhydrophobicity after various kinds of destruction(such as sandpaper abrasion,corrosive liquid attack,ultrasonic treatment,UV irradiation,and high-speed drops/turbulent jets impact).Even though the superhydrophobicity can be destroyed by plasma etching,it can be recovered after 12 h at room temperature.

关键词： Bionic coating Superhydrophobic Thermochromic Photochromic Robust

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A Superhydrophobic/Electrothermal/Photothermal Synergistically Anti-icing Strategy with Excellent Self-healable and Anti-abrasion Property

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Journal of Bionic Engineering 2021年第5期18卷 1147-1156页

作者： Peng Wang Jian Wang Wei Duan Chunyan Li Huilong Han Qing Xie School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBaodingChina hebei key laboratory of electric machinery health maintenance and failure prevention North China Electric Power UniversityBaoding 071003China School of electrical and Electronic Engineering North China Electric Power UniversityBaodingHebeiChina

Unexpected ice accumulation tends to cause many problems or even disasters in our daily *** on the superior electrothermal and photothermal function of the carbon nanotubes,we introduced a superhydrophobic/electrothermal/photothermal synergistically anti-icing *** a voltage of 15 V was applied to the superhydrophobic sample,the surface could rapidly melt the ice layer(~3 mm thickness)within 530 s at the environmental temperature of-25℃.When the near-infrared light(808 nm)irradiates on the superhydrophobic sample,the ice could be rapidly removed after 460 *** was found that the superhydrophobicity helps the melted water to roll off immediately,and then solves the re-freeze problem the traditional surfaces ***,the ice can be completely melted with 120 s when the superhydrophobic/electrothermal/photothermal synergistically anti-icing strategy was *** improve the mechanical robustness for practical application,both nanoscale carbon nanotubes and microscale carbon powders were utilized to construct hierarchical *** these dual-scale fillers were sprinkled onto the semi-cured elastomer substrate to prepare partially embedded *** hierarchical structure and partially embedded structure were obtained after completely curing the substrate,which imparts excellent abrasion resistance(12.50 kPa,16.00 m)to the prepared ***,self-healable poly(urea–urethane)elastomer was introduced as the ***,the cutted superhydrophobic sample can be mended by simply contacting at room temperature.

关键词： Superhydrophobic Electrothermal Photothermal Self-healing

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Mechanical design and analysis of bio-inspired reentrant negative Poisson’s ratio metamaterials with rigid-flexible distinction

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International Journal of Smart and Nano Materials 2024年第1期15卷 1-20页

作者： Xinchun Zhang Junyu Wang Qidong Sun Jingyang Li Sheng Zhou Junfeng Qi Ran Tao hebei key laboratory of electric machinery health maintenance&failure prevention North China Electric Power UniversityBaodingChina Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijingChina Beijing Spacecrafts Manufacturing Factory BeijingChina

Aiming at achieving tunable reentrant structures with rigidity and uniformity,respectively,the C-shaped and S-shaped reentrant metamaterials were proposed by the bionic design of animal *** beam theory and energy methodology,the analytical expressions of the equivalent elastic modulus of the metamaterials were *** in deformation modes,mechanical properties,and energy absorption capacities were characterized by using experiments and the finite element analysis *** effects of ligament angle and thickness on the mechanical characteristics of two novel metamaterials were investigated by using a parametric *** results show that the stiffness,deformation mode,stress-strain curve,and energy absorption effects of three metamaterials are significantly *** design philosophy can be extended from 2D to 3D and is applicable at multiple dimensions.

关键词： Re-entrant mechanical metamaterials negative poisson’s ratio enhanced stiffness rigid-flexible distinction energy absorption

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A Superhydrophobic Hydrogel for Self-Healing and Robust Strain Sensor with Liquid Impalement Resistance

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Chinese Journal of Chemistry 2021年第12期39卷 3393-3398页

作者： Peng Wang Tao Chen Xuesong Zhang Wei Duan Chongyuan Zhang Huilong Han Qing Xie School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBaodingHebei 071003China hebei key laboratory of electric machinery health maintenance&failure prevention North China Electric Power UniversityBaodingHebei 071003China School of electrical and Electronic Engineering North China Electric Power UniversityBaodingHebei 071003China

The superhydrophobic strain sensor is a fantastic direction,which could protect the strain sensor in harsh ***,the self-healing superhydrophobic strain sensor has not been *** this research,we developed a superhydrophobic strain sensor,which demonstrated excellent self-healing,mechanical robustness,and liquid impalement resistance *** key innovation is to partially embed hydrophobic graphene and carbon nanotubes into the hydrogel *** hodrogel substrate endows the sample with self-healing *** graphene,carbon nanotubes and hydrogel together lead to an accurate and real-time monitoring of human ***,the prepared sample demonstrated super-robust superhydrophobicity,which retained superhydrophobicity after many kinds of damage(such as 1000%stretch,10000 stretching-releasing cycles,hand-rub,tape-peeling,and high-speed drop/jet impact).

关键词： Hydrophobic effect Gels Graphene Strain sensor Self-healing

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A Passive Anti-icing Strategy Based on a Superhydrophobic Mesh with Extremely Low Ice Adhesion Strength

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Journal of Bionic Engineering 2021年第1期18卷 55-64页

作者： Peng Wang Ziqiang Li Qing Xie wei Duan Xinchun Zhang Huilong Han School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBaoding 071000China hebei key laboratory of electric machinery health maintenance&failure prevention North China Electric Power UniversityBaoding 071003China School of electrical and Electronic Engineering North China Electric Power UniversityBaoding 071003China

Although superhydrophobic materials have attracted much research interest in anti-icing,some controversy still *** this research,we report a cost-effective method used to verify the contribution of area fraction to ice adhesion *** tried to partially-embed siliea nanopnarticles into microscale fabrics of a commercial polyamide ***,the area fraction could be determined by altering the mesh ***,the ice adhesion strength decreases as the area fraction *** ice adhesion strength of~1.9 kPa and a delayed freezing time of~1048 s can be *** attribute the low ice adhesion strength to the combination of superhydro-phobicity and stress *** superhydrophobicity prohibits the water from penetrating into the voids of the meshes,and the small actual contact area leads to stress concentration which promotes interfacial crack ***,our superhydrophobic mesh simultaneously exhibis a micro-nano hierarchical structure and a partally-cmbedded ***,the as-prepared superhydrophobic mesh retained the ieephobicity after 20 icingldeicing cycles,and maintained its superhydrophobicity even afier 60 sandpaper-abrasion cycles and a 220"C thermal treatment.

关键词： bionic superhydrophobic anti-icing mechanical robustness hierarchical structure partially-embedded structure

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Dynamic crushing behaviors and enhanced energy absorption of bio-inspired hierarchical honeycombs with different topologies

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Defence Technology（防务技术） 2023年第4期22卷 99-111页

作者： Xin-chun Zhang Nan-nan Liu Chao-chao An He-xiang Wu Na Li Ke-ming Hao Department of Mechanical Engineering North China Electric Power UniversityBaoding071003China hebei key laboratory of electric machinery health maintenance&failure prevention North China Electric Power UniversityBaoding071003China School of Civil Engineering Northeast Forestry UniversityHarbin150040China Department of Intelligent Engineering Hebei Software InstituteBaoding071000China

In order to pursue good crushing load uniformity and enchance energy absorption efficiency of conventional honeycombs, a kind of bio-inspired hierarchical honeycomb model is proposed by mimicking the arched crab shell structures. Three bio-inspired hierarchical honeycombs(BHHs) with different topologies are designed by replacing each vertex of square honeycombs with smaller arc-shaped structures. The effects of hierarchical topologies and multi-material layout on in-plane dynamic crushings and absorbed-energy capacities of the BHHs are explored based on the explicit finite element(FE) *** deformation modes can be observed from the BHHs, which mainly depend upon hierarchical topologies and impact velocities. According to energy efficiency method and one-dimensional(1D) shock theory, calculation formulas of densification strains and plateau stresses for the BHHs are derived to characterize the dynamic bearing capacity, which is consistent well with FE results. Compared with conventional honeycombs, the crushing load efficiency and energy absorption capacity of the BHHs can be improved by changing the proper hierarchical topology and multi-material layout. These researches will provide theoretical guidance for innovative design and dynamic response performance controllability of honeycombs.

关键词： Bio-inspired honeycombs Crushing load uniformity Energy absorption Hierarchical topologies Finite element analysis

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Microstructure evolution of Ti5Si3 in Cu-Ti-Si alloys

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China Foundry 2020年第4期17卷 286-292页

作者： Qing Liu Xiao-cui Zhang Qiang Wang Wen-zhi Miao Chun-yan Li Hai-min Ding School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBaoding 071003China State Grid Shandong electric Power maintenance Company Jinan 250021China hebei key laboratory of electric machinery health maintenance&failure prevention North China Electric Power UniversityBaoding 071003China

The Cu-Ti-Si alloys containing in-situ formed Ti5Si3 are prepared. In order to clarify the Ti5Si3 formation processes and its microstructure characteristics, the as-cast and deeply etched Cu-Ti-Si alloys with different compositions and cooling rates were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). It is found that the eutectic Ti5Si3 phases in Cu-Ti-Si alloys are rod-like with hexagonal cross section which tend to intertwine with each other to form a firm skeleton like a bird nest structure which can make the alloys keep their original shape even after etching off the Cu matrix. In addition, there is Cu in the center of many Ti5Si3 rods, resulting in a core-shell structure. With the increase of the cooling rate, Ti5Si3 distributes more uniformly, and the diameter of Ti5Si3 significantly decreases, with a minimum size of less than 100 nm, while the aspect ratio of Ti5Si3 increases.

关键词： microstructures Cu alloys Ti5Si3 intermetallic compounds

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Exploring the Mechanism,Advancements,and Application of Thermogalvanic Effect in Hydrogels

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Chinese Journal of Chemistry 2024年第5期42卷 543-556页

作者： Xiaoyu Yang Peng Wang Xiaolong Wu Yongli Liao Senyun Liu Wei Duan Ying Yue School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBaodingHebei071000 China hebei key laboratory of electric machinery health maintenance & failure prevention North China Electric Power UniversityBaodingHebei071003 China electric Power Research Institute China South Power GridGuangzhouGuangdong510000 China key laboratory of Icing and Anti/De-icing China Aerodynamics Research and Development CenterMianyangSichuan621000 China

The issue of energy consumption has garnered significant interest due to its excessive ***,thermoelectric devices have been getting increased attention,as they can harness waste heat from various sources,such as solar radiation,human body,and industrial ***,the recovery of low-grade heat has been a challenge,resulting in unsustainable energy use and significant *** considerable advances have been made in thermoelectric materials in recent decades,the majority of these devices still primarily employ ***,the emergence of quasi-solid-state thermoelectric materials represents a novel development with profound promise for the environment and *** materials offer several advantages,such as improved energy conversion capacities,cost-effectiveness,versatility,and scalability,to support increased ***,this review explores the application of thermoelectric materials in self-powered sensors,integrated modules,and heat harvesting ***,the potential of high-performance thermocouples based on thermogalvanic effects is assessed,along with the challenges that must be overcome to realize this goal.

关键词： Hydrogel Thermogalvanic effect Thermochemistry Electrolytes Flexible electronics

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