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Acta Mechanica Sinica 2018年第6期34卷 1124-1135页

作者： Nuttawit Wattanasakulpong Arisara Chaikittiratana Sacharuck Pornpeerakeat Department of Mechanical Engineering Mahanakom University of TechnologyNongchokBangkok 10530Thailand Department of Mechanical and Aerospace Engineering King Mongkut’s University of Technology North BangkokBangkok 10800Thailand Department of Teacher Training in Civil Engineering King Mongkut’s University of Technology North BangkokBangkok 10800Thailand Research Centre for Advanced Computational and Experimental Mechanics(RACE) King Mongkut’s University of Technology North BangkokBangkok 10800nailand

In this paper,vibration analysis of functionally graded porous beams is carried out using the third-order shear deformation *** beams have uniform and non-uniform porosity distributions across their thickness and both ends are supported by rotational and translational *** material properties of the beams such as elastic moduli and mass density can be related to the porosity and mass coefficient utilizing the typical mechanical features of open-cell metal *** Chebyshev collocation method is applied to solve the governing equations derived from Hamilton's principle,which is used in order to obtain the accurate natural frequencies for the vibration problem of beams with various general and elastic boundary *** on the numerical experiments,it is revealed that the natural frequencies of the beams with asymmetric and non-uniform porosity distributions are higher than those of other beams with uniform and symmetric porosity distributions.

关键词： Functionally graded porous beam Vibration analysis Chebyshev collocation method Elastic boundary condition

Frictionally excited thermoelastic dynamic instability of functionally graded materials

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Acta Mechanica Sinica 2019年第1期35卷 99-111,I0004页

作者： J.Liu L.L.Ke Y.S.Wang College of Engineering Huazhong Agricultural UniversityWuhan 430070China Institute of Engineering Mechanics Beijing JiaotongUniversity Beijing 100044China

The perturbation method is applied to investigate the frictionally excited thermoelastic dynamic instability (TEDI) of a functionally graded material (FGM) coating in half-plane sliding against a homogeneous half-plane. We assume that the thermoelastic properties of the FGM vary exponentially with thickness. We also examine the effects of the gradient index, sliding speed, and friction coefficient on the TEDI for various material combinations. The transverse normal stress for two different coating structures is calculated. Furthermore, the frictional sliding stability of two different coating structures is analyzed. The obtained results show that use of FGM coatings can improve the TEDI of this sliding system and reduce the possibility of interfacial failure by controlling the interfacial tensile stress.

关键词： Thermoelastic dynamic instability Frictional heat Functionally graded materials Stress analysis

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

Complex dynamics of functionally graded plates with thermal load in 1:2 internal resonance

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Science China(Technological Sciences) 2010年第3期53卷 713-719页

作者： DING Ran 1 &WU ZhiQiang 1,2 1 Department of Mechanics,Tianjin University,Tianjin 300072,China 2 State Key Laboratory of Engines,Tianjing 310002,China Department of Mechanics Tianjin University Tianjin China State Key Laboratory of Engines Tianjing China

Complex dynamics of the simply-supported functionally graded(FG)rectangular plates with thermal load is *** on Reddy's third-order shear deformation theory and the von Karman nonlinear strain-displacement relations,ordinary differential equations(ODEs)of the plate's transversal oscillation are derived by using Hamilton's principle and Galerkin's ***'classification of the equations in 1:2 internal resonance is *** results of a simplysupported aluminum-alumina rectangular FG plate are *** of temperature and volume fraction on the responses' stabilities are discussed.

关键词： functionally graded materials thermal load 1 internal resonance solutions’ classification modal interactions

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

Bending analysis of a functionally graded piezoelectric cantilever beam

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Science China(Physics,Mechanics & Astronomy) 2007年第1期50卷 97-108页

作者： YU Tao ZHONG Zheng School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China

A new analysis based on Airy stress function method is presented for a functionally graded piezoelectric material cantilever beam. Assuming that the mechanical and electric properties of the material have the same variations along the thickness direction, a two-dimensional plane elasticity solution is obtained for the coupling electroelastic fields of the beam under different loadings. This solution will be useful in analyzing FGPM beam with arbitrary variations of material properties. The influences of the functionally graded material properties on the structural response of the beam subjected to different loads are also studied through numerical examples.

关键词： functionally graded piezoelectric material cantilever beam bending electroelastic fields

Dynamic response and optimization of an inclined steel rock shed by the graded energy dissipating method

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Journal of Mountain Science 2019年第1期16卷 138-152页

作者： WU Yong HE Si-ming LI Xin-po Wang Dong-po Key Laboratory of Mountain Hazards and Earth Surface Process Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology

Blocking rockfalls directly by reinforced concrete(RC) flat sheds with thick sand cushions is an outdated method. Such conventional sheds typically accumulate rock heavily, and become progressively damaged and are difficult to repair, and are very costly. To address these problems, we propose a new structure called a graded Dissipating Inclined Steel Rock(GDISR) shed that utilizes the graded energy dissipation method. Here, we study the dynamic response of the GDISR shed with model test and numerical simulation, and give its optimization design combining with a practical engineering case. Our results show that the optimized modular E-block and corrugated steel tube can deform to sufficiently absorb the energy of different impact intensities. This efficiently and economically provides GDISR sheds with two security lines. Compared with conventional RC sheds, GDISR sheds with optimal incline have a more efficient anti-impact function, are faster and easier to repair, and are much simpler and cheaper to build.

关键词： Dynamic response Optimization design graded dissipating inclined steel rock shed

Electric field control by permittivity functionally graded and superficially non-linear conductivity materials for DC-GIS spacer

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High Voltage 2022年第5期7卷 992-1000页

作者： Boxue Du Jianan Dong Hucheng Liang School of Electrical and Information Engineering Tianjin UniversityTianjinChina

This paper offers a simulation study on the application of a novel approach to control the electric field around a basin-type spacer by combining permittivity functionally graded materials(ε-FGM)and superficially non-linear conductivity materials(SNCM),namely multi-dimensional functional materials(MDFM).The permittivity distribution of theε-FGM spacer is designed by the iteration optimization algorithm,and the epoxy/SiC composites with 30 and 60 phr doping contents are assigned as the coating materials of two SNCM spacers,namely SNCM30 and *** MDFM spacer combinesε-FGM in its bulk and SNCM60 on its *** electric field regulation effect of each functional spacer is investigated under variable conditions,that is,DC steady state(DC-steady),DC turn-on state(DC-on),DC polarity reversal(DC-PR),and DC superimposed with switching impulse voltage(DC-SI).Results show that the applicability ofε-FGM and SNCM is limited to transient and stationary conditions,*** MDFM spacer combines the advantages ofε-FGM and SNCM for adaptively relaxing the electric field under all the above *** is hoped that this research will be beneficial to the development and application of spacers for the direct current gas-insulated switchgear(DC-GIS).

关键词： composites graded field

Electro-mechanical response of functionally graded beams with imperfectly integrated surface piezoelectric layers

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Science China(Physics,Mechanics & Astronomy) 2006年第5期49卷 513-525页

作者： YAN Wei1 & CHEN Weiqiu1,2 1. Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China 2. State Key Lab of CAD & CG, Zhejiang University, Hangzhou 310027, China Department of Civil Engineering Zhejiang University Hangzhou China State Key Lab of CAD & CG Zhejiang University Hangzhou China

The time-dependent behavior of a simply-supported functionally graded beam bonded with piezoelectric sensors and actuators is studied using the state-space method. The creep behavior of bonding adhesives between piezoelectric layers and beam is characterized by a Kelvin-Voigt viscoelastic model, which is practical in a high temperature circumstance. Both the host elastic functionally graded beam and the piezoelectric layers are orthotropic and in a state of plane stress, with the former being inhomogeneous along the thickness direction. A laminate model is employed to approximate the host beam. Moreover, the coupling effect between the elastic deformation and electric field in piezoelectric layers is considered. Results indicate that the viscoelastic property of interfacial adhesives has a significant effect on the function of bonded actuators and sensors with time elapsing.

关键词： functionally graded beam piezoelectric layers Kelvin-Voigt model state-space method

Thermoelastic Stress in a Functionally graded Infinite Plate with Electromagnetic Wave Absorption

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Chinese Physics Letters 2012年第11期29卷 165-168页

作者： TIAN Hong-Yan WANG Xing-Zhe ZHOU You-He Key Laboratory of Mechanics on Disaster and Environment in Western China(Ministry of Education) and College of Civil Engineering and MechanicsLanzhou UniversityLanzhou 730000

We present an analysis of thermal and thermoelastic behaviors of a functionally graded infinite plate taking into account electromagnetic wave *** treat with the inhomogeneity of functionally graded wave-absorbing(FGWA)materials,the plate is approximated by subdividing it into thin homogeneous layers to solve the governing equations together with proper boundary and connecting *** results illustrate that the FGWA plate is a broadband type absorber with electromagnetic wave *** choosing proper material gradation character and the thickness of the FGWA plate,it is possible to obtain a good performance of electromagnetic wave absorption and thermoelastic stress characteristics.

关键词： absorption plate graded