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MICROSTRUCTURE　OF　NiCoCrAlY　COMPONENT　IN　PLASMA　SPRAYED　ZrO_2/NiCoCrAlY　graded　COATING

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中国有色金属学会会刊：英文版 1997年第1期7卷 107-111页

作者： Xiang, Xinghua Zhu, Jinchuan Yin, Zhongda Harbin Inst of Technology Harbin China

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关键词： plasma spraying graded coating NiCoCrAlY microstructure

Formation of Ti-N graded bioceramic layer by DC hollow-cathode plasma nitriding

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中国有色金属学会会刊：英文版 2004年第Z1期14卷 319-322页

作者： ZHENG Chuan-lin Department of Mechanical Engineering Beijing Jiaotong University Beijing 100044 China

Ti-N graded ceramic layer was formed on titanium by using DC hollow-cathode plasma nitriding technique. The structure of Ti-N layer was analyzed using X-ray diffractometry(XRD) with Cu Kα radiation, and the microhardness( HV0.1) was measured from the surface to inner along the cross section of Ti-N layer. The results indicate that the Ti-N graded layer is composed of ε-Ti2 N, δ-TiN and α-Ti(N) phases. Mechanism discussion shows that hollow-cathode discharge can intensify gas ionization, increase current density and enhance the nitriding potential, which directly increases the thickness of the diffusion coatings compared with traditional nitriding methods.

关键词： Ti-N graded ceramic layer hollow-cathode plasma nitriding

Holographic fabrication of octagon graded photonic supercrystal and potential applications in topological photonics

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Frontiers of Optoelectronics 2020年第1期13卷 12-17页

作者： Oliver SALE Safaa HASSAN Noah HURLEY Khadijah ALNASSER Usha PHILIPOSE Hualiang ZHANG Yuankun LIN Department of Physics University of North TexasDentonTX 76203USA ECE Department University of Massachusetts LowellLowellMA 01854USA Department of Electrical Engineering University of North TexasDentonTX 76203USA

Novel optical properties in graded photonic super-crystals can be further explored if new types of graded photonic super-crystals are *** this paper,we report holographic fabrication of graded photonic super-crystal with eight graded lattice clusters surrounding the central non-gradient lattices through pixel-by-pixel phase engineering in a spatial light *** prospect of applications of octagon graded photonic super-crystal in topological photonics is discussed through photonic band gap engineering and coupled ring resonators.

关键词： 2D photonic crystal graded photonic supercrystal holographic fabrication photonic band structure

An analysis of surface acoustic wave propagation in a plate of functionally graded materials with a layered model

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Science China(Physics,Mechanics & Astronomy) 2008年第2期51卷 165-175页

作者： GAO LiMing WANG Ji ZHONG Zheng DU JianKe College of Aerospace Engineering and Mechanics Tongji UniversityShanghai 200092China Piezoelectric Device Laboratory School of EngineeringNingbo UniversityNingbo 315211China

In a homogeneous plate, Rayleigh waves will have a symmetric and anti-symmetric mode regarding to the mid-plane with different phase velocities. If plate properties vary along the thickness, or the plate is of functionally graded material (FGM), the symmetry of modes and frequency behavior will be modified, thus producing dif-ferent features for engineering applications such as amplifying or reducing the velocity and deformation. This kind of effect can also be easily realized by utilizing a layered structure with desired material properties that can produce these effects in terms of velocity and displacements, since Rayleigh waves in a solid with gen-eral material property grading schemes are difficult to analyze with known methods. Solutions from layered structures with exponential and polynomial property grad-ing schemes are obtained from the layered model and comparisons with known analytical results are made to validate the method and examine possible applica-tions of such structures in engineering.

关键词： Rayleigh wave surface acoustic wave vibration plate layered structure functionally graded material (FGM)

Analytical solution and semi-analytical solution for anisotropic functionally graded beam subject to arbitrary loading

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Science China(Physics,Mechanics & Astronomy) 2009年第8期52卷 1244-1256页

作者： HUANG DeJin1,2,DING HaoJiang1 & CHEN WeiQiu3 1 Key Laboratory of Soft Soils and Geoenvironmental Engineering,Ministry of Education,Zhejiang University,Hangzhou 310027,China 2 Faculty of Engineering,Ningbo University,Ningbo 315211,China 3 Department of Engineering Mechanics,Zhejiang University,Hangzhou 310027,China Key Laboratory of Soft Soils and Geoenvironmental Engineering Ministry of Education Zhejiang University Hangzhou China Faculty of Engineering Ningbo University Ningbo China Department of Engineering Mechanics Zhejiang University Hangzhou China

Analytical and semi-analytical solutions are presented for anisotropic functionally graded beams subject to an arbitrary load,which can be expanded in terms of sinusoidal *** plane stress problems,the stress function is assumed to consist of two parts,one being a product of a trigonometric function of the longitudinal coordinate(x) and an undetermined function of the thickness coordinate(y),and the other a linear polynomial of x with unknown coefficients depending on *** governing equations satisfied by these y-dependent functions are *** expressions for stresses,resultant forces and displacements are then deduced,with integral constants determinable from the boundary *** the analytical solution is derived for the beam with material coefficients varying exponentially or in a power law along the thickness,the semi-analytical solution is sought by making use of the sub-layer approximation for the beam with an arbitrary variation of material parameters along the *** present analysis is applicable to beams with various boundary conditions at the two *** numerical examples are presented for validation of the theory and illustration of the effects of certain parameters.

关键词： anisotropic material functionally graded arbitrary loading stress function analytical solution semi-analytical solution

Minimisation of electric field stress at triple junction of a functionally graded cone type spacer in a gas insulated busduct with metal inserts

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High Voltage 2017年第2期2卷 110-118页

作者： Yerra Swamy Naidu Gundavarapu Venkata Nagesh Kumar Department of EEE Vizag Institute of TechnologyVisakhapatnamIndia Department of EEE Vignan's Institute of Information TechnologyVisakhapatnamIndia

Insulation integrity of supporting insulator plays a vital role for determining the continuity of service of the gas insulated substation which depends upon the electric field stress distribution on the surface of the *** junction formed by the conductor,SF6 gas and support insulator is another critical area where the field stress is to be maintained at minimum *** control is a technique employed for obtaining uniform field stress along the surface of the spacer but this technique may sometimes leads to very uneven *** this study,a functional graded material is designed for the standard cone type spacer to obtain uniform field stress along the surface of spacer to overcome the above *** grading of spacer is done with different *** field is computed for three cases namely grading to high,grading to low and U *** metal inserts were tuned and stress is obtained in account of lower fields at the triple point junction and an improved uniform field distribution along the surface is obtained.

关键词： stress graded field

Theoretical analysis on bending behavior of functionally graded composite beam crack-controlled by ultrahigh toughness cementitious composites

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Science China(Technological Sciences) 2009年第2期52卷 363-378页

作者： XU ShiLang LI QingHua State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

Ultrahigh toughness cementitious composites (UHTCC) obviously show strain hardening property under tensile or bending loading. The failure pattern of the UHTCC components exhibits multiple fine cracks under uniaxial tensile loading with prominent tensile strain capacity in excess of 3%, with merely 60 μm average crack width even corresponding to the ultimate tensile strain state. The approach adopted is based on the concept of functionally-graded concrete, where part of the concrete, which surrounds the main longitudinal reinforcement in a RC (reinforced concrete) member, is strategically replaced with UHTCC with excellent crack-controlling ability. Investigations on bending behavior of functionally-graded composite beam crack controlled by UHTCC has been carried out, including theo- retical analysis, experimental research on long composite beams without web reinforcement, validation and comparison between experimental and theoretical results, and analysis on crack control. In addition to improving bearing capacity, the results indicate that functionally-graded composite beams using UHTCC has been found to be very effective in preventing corrosion-induced damage compared with RC beams. Therefore, durability and service life of the structure could be enhanced. This paper discusses the development of internal force and crack propagation during loading process, and presents analysis of the internal force in different stages, moment-curvature relationship from loading to damage and calculation of mid-span deflection and ductility index. In the end, the theoretical formulae have been validated by experimental results.

关键词： UHTCC (ultrahigh toughness cementitious composites) crack control functionally graded bending behavior theoretical analysis

Basic solution of two parallel Mode-I cracks in functionally graded materials

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Science China(Technological Sciences) 2008年第9期51卷 1380-1393页

作者： LIANG Jun Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China Center for Composite Materials and Structures Harbin Institute of Technology Harbin China

The solution of two parallel cracks in functionally graded materials subjected to a tensile stress loading is derived in this paper. To make the analysis tractable, it is assumed that the shear modulus varies exponentially with coordinate parallel to the crack. The problem is formulated through Fourier transform into four pairs of dual integral equations, in which the unknown variables are jumps of displace-ments across crack surfaces. To solve the dual integral equations, the jumps of displacements across crack surfaces are directly expanded as a series of Jacobi polynomials to obtain the shielding effects of the two parallel cracks in functionally graded materials.

关键词： parallel cracks shielding effects functionally graded materials

Promising functional graded materials for compact gaseous insulated switchgears/pipelines

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High Voltage 2020年第3期5卷 231-240页

作者： Jin Li Hucheng Liang Yun Chen Boxue Du School of Electrical and Information Engineering Tianjin UniversityTianjin 300072People's Republic of China China Electric Power Research Institute Beijing 100192People's Republic of China

The electric field distributions along gas-solid interfaces determine the reliability,lifetimes and sizes of gaseous insulated switchgears/pipelines(GIS/GIL),which also affect the reliability of power *** this study,the characteristics of steady and transient electric field distributions were first introduced,followed by the concept of functionally graded materials(FGMs).The development histories of FGM applied in electrical engineering and the related optimisation methods were described in *** field regulation effect and fabrication technology of different FGM insulators were also *** overcome the limitations of traditional FGM insulators,the design of surface FGM(SFGM)was proposed,together with their preparation methods and electrical ***,the future development prospects of FGM and SFGM insulators for compact GIS/GIL were summarised.

关键词： FGMs graded electrical