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The stress-controlled mechanism of deep-buried tunnels based on functional gradient reinforcement in high tectonic stress zones 认领 引用
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作者 Yaocai Ma Hehua Zhu +4 位作者 Wuqiang Cai Chenlong Su Xiangyang Wei Zhi Zheng Jian Pu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第4期2702-2724,共23页
Grouting reinforcement serves as a critical measure for the stability design and disaster prevention of deep-buried tunnels.However,the grouting reinforcement effect on the unloading stress path of surrounding rock in... Grouting reinforcement serves as a critical measure for the stability design and disaster prevention of deep-buried tunnels.However,the grouting reinforcement effect on the unloading stress path of surrounding rock in high tectonic stress zones and its mechanisms for disaster prevention and control remain unclear.This paper proposes a functional gradient bearing concept for grouting reinforcement of fractured surrounding rock in deep-buried tunnels.The functionally graded reinforced zone is designed,exhibiting a radial mechanical property gradient where stiffness increases and strength decreases from shallow to deep regions of the surrounding rock.A semi-analytical method based on the complex variable theory is specificallydeveloped for elastic-plastic mechanical analysis of reinforced surrounding rock.Subsequently,the effects of rock strength and stiffness on the morphological characteristics of the plastic zone around deep-buried circular tunnels in high tectonic stress zones are investigated.The study shows that:(1)The annular grouting reinforcement design has limited effectiveness in preventing the failure of surrounding rock;(2)Grouting reinforcement significantlyenhances the bearing capacity of tunnels in weak and fractured rock masses,but excessive grouting to control the plastic zone is not recommended;(3)The bearing capacity of the shallow surrounding rock and the stress regulating function of the deeper surrounding rock can be fully utilized if the functional gradient bearing concept is considered,achieving coordinated bearing between shallow and deep surrounding rock.The research provides new insights for the gradient grouting reinforcement and stress control optimization design of surrounding rock in deep-buried circular tunnels. 展开更多
关键词 High tectonic stress Deep-buried tunnel Complex variable method Functional gradient reinforcement Generalized Zhang-Zhu(GZZ)strength theory Surrounding rock stability
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Electrical,Thermal,and Mechanical Properties of Cu/Ti3AlC2 Functional Gradient Materials Prepared by Low-temperature Spark Plasma Sintering 认领 引用 被引量：3
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作者 CHEN Yanlin PENG Hang +3 位作者 LOU Lang HUANG Kang YAN Ming WU Chonggang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2019年第4期876-882,共7页
Cu/Ti3AlC2composite and functional-gradient materials with excellent electrical conductivity and thermal conductivity as well as good flexural properties were prepared by low-temperature spark plasma sintering o... Cu/Ti3AlC2composite and functional-gradient materials with excellent electrical conductivity and thermal conductivity as well as good flexural properties were prepared by low-temperature spark plasma sintering of Cu and Ti3AlC2 powder mixtures.The phase compositions of the materials were analyzed by X-ray diffraction,and their microstructure was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy.Further,the electrical conductivity,thermal conductivity,and flexural properties of the materials were tested.Results show that,for the composite materials,the resistivity rises from 0.75×10^-7Ω·m only to 1.32×10^-7Ω·m and the thermal diffusivity reduces from 82.5 mm^2/s simply to 39.8 mm^2/s,while the flexural strength improves from 412.9 MPa to 471.3 MPa,as the content of Ti3AlC2 is increased from 5 wt%to 25 wt%.Additionally,the functional-gradient materials sintered without interface between the layers exhibit good designability,and their overall electrical conductivity,thermal conductivity,and flexural strength are all higher than those of the corresponding uniform composite material. 展开更多
关键词 Cu/Ti3AlC2 functional gradient material electrical conductivity thermal conductivity
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Flexural Mechanical Properties of Functional Gradient Hydroxyapatite Reinforced Polyetheretherketone Biocomposites 认领 引用
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作者 Yusong Pan Yan Chen Qianqian Shen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2016年第1期34-40,共7页
Functional gradient hydroxyapatite reinforced polyetheretherketone is one of the most promising or- thopedic implant biomaterials. In this study, functional gradient hydroxyapatite reinforced polyetheretherketone bioc... Functional gradient hydroxyapatite reinforced polyetheretherketone is one of the most promising or- thopedic implant biomaterials. In this study, functional gradient hydroxyapatite reinforced polyetheretherketone biocomposites were prepared by layer-by-layer method with the incorporation of hot press molding technology. Studies on the flexural mechanical properties of the functional gradient biocomposites revealed that the flexural stress-stain behavior of the biocomposites presented linear elastic characteristics. The fracture mechanism of the functional gradient biocomposites was predominated by brittle rupture. Furthermore, both flexural strength and break strain of the functional gradient HA/PEEK biocomposites obviously decreased with the rise of the total HA content. The effect of hydroxyapatite concentration difference between adjacent layers （HCDBAL） on the flexural strength obviously relied on the level of HCDBAL and total HA content in the functional gradient HA/PEEK biocomposites. The higher the total HA content in the functional gradient biocomposites is, the less the influence degree of HCDBAL on the flexural strength is. Moreover, total HA content and HCDBAL played synergistic influence on the flexural modulus of the functional gradient HA/PEEK biocomposites. 展开更多
关键词 Hydroxyapatite Functional gradient HA/PEEK biocomposites Flexural strength Flexural modulus
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ELASTOPLASTIC OPTIMUM DESIGN OF Ni/TiC FUNCTIONAL GRADIENT MATERIAL 认领 引用 被引量：1
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作者 南策文 张清杰 +2 位作者 蔡克峰 闵新民 袁润章 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1994年第2期8-14,共7页
The thermal residual stresses developed in a disk-shaped, Ni/TiC functionally gradient material (FGM) during its fabrication are investigated by an elastic-plastic finite element numerical ap-proach. Constitutive rela... The thermal residual stresses developed in a disk-shaped, Ni/TiC functionally gradient material (FGM) during its fabrication are investigated by an elastic-plastic finite element numerical ap-proach. Constitutive relations for the graded Ni-TiC composite inter-layers between pure metal Ni and ceramic TiC are estimated by using an effectiv-medium approach, and effective plastic strain and stress distributions are computed for simulated cooling from an assumed fab-rication temperature. Analyses are performed for a fixed specimen ge-ometry and the graded region is treated as a series of perfectly bonded equal-thick layers. The results are compared with those obtained by on-ly considering elastic material response to assess the effect of plasticity on the optimum fabrication design of the Ni/TiC FGM. It is demon-strated that the consideration of plasticity is of critical importance for optimization of the metal/ceramic gradient materials. 展开更多
关键词 V'i/T'iC functionally gradient material.
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Functionally gradient materials for sustainable and high-energy rechargeable lithium batteries:Design principles,progress,and perspectives 认领 引用 被引量：1
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作者 Jiaojiao Deng Xiuyun Ren +7 位作者 Hai Lin Liang Hu Yu Bai Xiaoliang Yu Jinhan Mo Qianling Zhang Feiyu Kang Baohua Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第12期426-449,共24页
Rechargeable lithium batteries with high-capacity cathodes/anodes promise high energy densities for nextgeneration electrochemical energy storage.However,the associated limitations at various scales greatly hinder the... Rechargeable lithium batteries with high-capacity cathodes/anodes promise high energy densities for nextgeneration electrochemical energy storage.However,the associated limitations at various scales greatly hinder their practical applications.Functional gradient material(FGM)design endows the electrode materials with property gradient,thus providing great opportunities to address the kinetics and stability obstacles.To date,still no review or perspective has covered recent advancements in gradient design at multiple scales for boosting lithium battery performances.To fill this void,this work provides a timely and comprehensive overview of this exciting and sustainable research field.We begin by overviewing the fundamental features of FGM and the rationales of gradient design for improved electrochemical performance.Then,we comprehensively review FGM design for rechargeable lithium batteries at various scales,including natural or artificial solid electrolyte interphase(SEI)at the nanoscale,micrometer-scale electrode particles,and macroscale electrode films.The link between gradient structure design and improved electrochemical performance is particularly highlighted.The most recent research into constructing novel functional gradients,such as valence and temperature gradients,has also been explored.Finally,we discussed the current constraints and future scope of FGM in rechargeable lithium batteries,aiming to inspire the development of novel FGM for next-generation high-performance lithium batteries. 展开更多
关键词 Rechargeable lithium battery Functional gradient material High energy density Long cycle life Review
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Different compositions of TC4/TC11 functional gradient materials interface by wire arc additive manufacturing 认领 引用 被引量：1
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作者 WANG JiaChen WANG He +1 位作者 XU TianQiu LIU ChangMeng 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第12期3777-3782,共6页
Titanium alloy is widely utilized in diverse industries due to its exceptional specific strength,making it a material with significant potential for advancement.Nevertheless,homogeneous materials are inadequate to mee... Titanium alloy is widely utilized in diverse industries due to its exceptional specific strength,making it a material with significant potential for advancement.Nevertheless,homogeneous materials are inadequate to meet the demands of various applications.Functional gradient materials(FGMs)have garnered increasing interest for their ability to tailor materials and structures.The continuous transition in FGMs often offers a more uniform and well-connected interface.However,there remains a lack of comprehensive research on the transition interface.In this study,TC4/TC11 double-alloy materials were produced using doublewire additive manufacturing.The wire feeding rates were adjusted to create materials with varying compositions.The grain morphologies,microstructures,and mechanical properties were examined.It was observed that as the TC11 content increased,the grain size decreased,theβcontent rose,the ultimate tensile strength improved,and the elongation decreased.Additionally,analysis of the fracture morphologies revealed that the dimples became smaller,indicating characteristics of ductile fracture.Following the solid solution aging heat treatment,it is observed that theαphase increases in size,and the mechanical properties are enhanced.These observations indicate that double-wire additive manufacturing can produce diverse interfaces.Furthermore,the heat treatment process has been shown to enhance the material properties,thus establishing an experimental foundation for FGMs. 展开更多
关键词 additive manufacturing functional gradient materials titanium alloys transitional layers
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Crack tip field in functionally gradient material with exponential variation of elastic constants in two directions 认领 引用 被引量：3
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作者 Tianhu Hao 《Acta Mechanica Sinica》 SCIE EI CAS 2005年第6期601-607,共7页
This paper presents an exact solution of the crack tip field in functionally gradient material with exponential variation of elastic constants. The dimensionless Poisson＇s ratios v0 of the engineering materials （iro... This paper presents an exact solution of the crack tip field in functionally gradient material with exponential variation of elastic constants. The dimensionless Poisson＇s ratios v0 of the engineering materials （iron, glass …… ） are far less than one; therefore, neglecting them, one can simplify the basic equation and the exact solution is easy to obtain. Although the exact solution for the case v0 ≠ 0 is also obtained, it is very complicated and the main result is the same with the case v0 = 0 （it will be dealt with in Appendix VII）. It has been found that the exponential term exp（ax ＋ by） in the constitutive equations becomes exp（ ax /2 ＋ by/2- kr /2 ） in the exact solution. 展开更多
关键词 Crack Plane case Functional gradient material Exponential variation
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Characteristics of two Al based functionally gradient composites reinforced by primary Si particles and Si/in situ Mg_2Si particles in centrifugal casting 认领 引用 被引量：16
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作者 翟彦博 刘昌明 +2 位作者 王开 邹茂华 谢勇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第3期361-370,共10页
Two kinds of Al based functionally gradient composite tubes reinforced by primary Si particles alone and primary Si/in situ Mg2Si particles jointly were successfully prepared by centrifugal casting,and their structura... Two kinds of Al based functionally gradient composite tubes reinforced by primary Si particles alone and primary Si/in situ Mg2Si particles jointly were successfully prepared by centrifugal casting,and their structural and mechanical characters were compared.It is found that the composite reinforced with primary Si particles takes a characteristic of particles distribution both in the inner and outer layers.However,composite reinforced with primary Si/Mg2Si particles jointly takes a characteristic of particles distribution only in the inner layer and shows a sudden change of particles distribution across the section of inner and outer layers.The hardness and wear resistance of Al-19Si-5Mg tube in the inner layer are greatly higher than that in the other layers of Al-19Si-5Mg tube and Al-19Si tube.Theoretical analysis reveals that the existence of Mg2Si particles is the key factor to form this sudden change of gradient distribution of two kinds of particles.Because Mg2Si particles with a lower density have a higher centripetal moving velocity than primary Si particles,in a field of centrifugal force,they would collide with primary Si particles and then impel the later to move together forward to the inner layer of the tube. 展开更多
关键词 centrifugal casting functionally gradient composites in situ primary Si particles in situ Mg2Si particles
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Developments in Processing of Functionally Gradient Metals and Metal–Ceramic Composites:A Review 认领 引用 被引量：7
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作者 T.P.D.Rajan B.C.Pai 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2014年第5期825-838,共14页
Functionally gradient/graded materials （FGMs）, an emerging new class of materials, are the outcome of the recent innovative concepts in materials technology. FGMs are in their early stages of evolution and expected ... Functionally gradient/graded materials （FGMs）, an emerging new class of materials, are the outcome of the recent innovative concepts in materials technology. FGMs are in their early stages of evolution and expected to have a strong impact on the design and development of new components and structures with better performance. FGMs exhibit gradual transitions in the microstructure and/or the composition in a specific direction, the presence of which leads to variation in the functional performance within a part. The presence of gradual transitions in material composition in FGMs can reduce or eliminate the deleterious stress concentrations and result in a wide gradation of physical and/or chemical properties within the material. Functionally graded metal-ceramic composites are also getting the attention of the researchers. Among the fabrication routes for FGMs such as chemical vapour deposition, physical vapour deposition, the sol-gel technique, plasma spraying, molten metal infiltration, self propagating high temperature synthesis, spray forming, centrifugal casting, etc., the ones based on solidification route are preferred for FGMs because of their economics and capability to make large size products. The present paper discusses and compares various solidification processing tech- niques available for the fabrication of functionally gradient metals and metal-ceramic composites and lists their properties and possible applications. The other processing methods are briefly described. 展开更多
关键词 Functionally gradient materials Solidification Aluminium Centrifugal casting Infiltration
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Synthesis,characterization and biological activity in vitro of FeCrAl(f)/HA asymmetrical biological functionally gradient materials 认领 引用 被引量：2
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作者 杨海林 李婧 +3 位作者 方华婵 周忠诚 童晓阳 阮建明 《Journal of Central South University》 SCIE EI CAS 2014年第2期447-453,共7页
FeCrAl(f)/HA biological functionally gradient materials(FGMs) were successfully fabricated by the hot pressing technique.Scanning electron microscope(SEM),energy dispersive spectrometer(EDS) and bending strength test ... FeCrAl(f)/HA biological functionally gradient materials(FGMs) were successfully fabricated by the hot pressing technique.Scanning electron microscope(SEM),energy dispersive spectrometer(EDS) and bending strength test machine were utilized to characterize the microstructure,component,mechanical properties and the formation of the Ca-deficient apatite on the surface of these materials.The results indicate that an asymmetrical FeCrAl(f)/HA FGM,consolidating powders prepared by mixing HA with 3%–15%(volume fraction) is successfully prepared.Both of the matrix and FeCrAl fiber are integrated very tightly and bite into each other very deeply.And counter diffusion takes place to some extent in two phase interfaces.The elemental compositions of the FeCrAl(f)/HA FGM change progressively.Ca and P contents increase gradually with immersion time increasing,and thereafter approach equilibrium.The bone-like apatite layer forms on the materials surface,which possesses benign bioactivity,and the favorable biocompatibility can provide potential firm fixation between FeCrAl(f)/HA asymmetrical FGM implants and human bone. 展开更多
关键词 hydroxyapatite（HA） FeCrAl fiber functionally gradient material（FGM） simulated body fluid（SBF） bone-like apatite
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Dynamic stress analysis of functionally gradient material subject to SH waves 认领 引用
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作者 Qi Lu Zhenqing Wang +2 位作者 Yun Zhu Zailin Yang Yong Yang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2024年第10期24-40,共17页
In this paper, the wave propagation in functionally graded materials (FGM) is studied by the elastic wave theory based on thewave problems in homogeneous media. The auxiliary function and modulus function are introduc... In this paper, the wave propagation in functionally graded materials (FGM) is studied by the elastic wave theory based on thewave problems in homogeneous media. The auxiliary function and modulus function are introduced to construct the displacementfield and density function. The displacement field, modulus function, and density function are connected to proposea design theory of special FGM. An analytical method for elastic wave propagation in inhomogeneous media with varyingmodulus and density is derived to provide theoretical references for material design and dynamic stress analysis under elasticwaves. Taking the problem of dynamic stress concentration caused by shallow buried elliptical cavity in half space designedunder SH waves as an example, the calculation results are obtained and analyzed. The results show that the dynamic stressconcentration is sensitive to the change of the inhomogeneity of the medium. 展开更多
关键词 Functional gradient materials Elastic wave Modulus Density Dynamic stress concentration
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Genetic Algorithm for the Thermal Stresses Optimum Design ofFunctionally Gradient Material Plate 认领 引用 被引量：2
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作者 Xiaodan Zhang Zhengbin Tang Changchun Ge 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 1999年第3期224-227,共4页
Based on the thermal stress distribution for functionally gradient material(FGM)plates,a Genetic Algorithm(GA)method for the thermal stresses optimum design of FGM plate with computer technologies is given.The minimum... Based on the thermal stress distribution for functionally gradient material(FGM)plates,a Genetic Algorithm(GA)method for the thermal stresses optimum design of FGM plate with computer technologies is given.The minimum thermal stresses combination distribution for FGM is obtained. 展开更多
关键词 functionally gradient material(FGM) thermal stress Genetic Algorithm(GA) crossover mutation
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Microstructure and Mechanical Properties of ZrO_2-Ni Functionally Gradient Material 认领 引用 被引量：1
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作者 Jingchuan ZHU Zhongda YIN and Zhonghong LAI 《Journal of Materials Science & Technology》 SCIE EI CAS 1994年第3期188-192,共5页
The fabrication. microstructure and mechanical properties of ZrO2-Ni functionally gradient materials (FGM ) have been studied. FGM as well as non-FG M of ZrO2-Ni system was developed by powder metallurgical process. X... The fabrication. microstructure and mechanical properties of ZrO2-Ni functionally gradient materials (FGM ) have been studied. FGM as well as non-FG M of ZrO2-Ni system was developed by powder metallurgical process. X-ray diffractometer (XRD ). electron probe microanalyzer (EPMA), scanning electron microscope (SEM ) and optical microscope were employed to investigate the crystalline phases. chemical composition and microstructure Experimental results demonstrate that the composition and microstructure of ZrO2-Ni FGM have the expected gradient distribution. There are no distinct interfaces in the FGM due to the gradient change of components. that is, the constituents are continuous in microstructure everywhere. Moreover, Vickers hardness and flexural strength were measured for the common composites as a function of composition. It is made clear that the mechanical properties of the FGM vary corresponding to the constitutional changes as well 展开更多
关键词 FGM PSZ Microstructure and Mechanical Properties of ZrO2-Ni Functionally Gradient Material Ni
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ANTI-PLANE SHEAR CRACK IN A FUNCTIONALLY GRADIENT PIEZOELECTRIC MATERIAL 认领 引用 被引量：2
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作者 Hu Keqiang Zhong Zheng Jin Bo 《Acta Mechanica Solida Sinica》 SCIE 2002年第2期140-148,共9页
The main objective of this paper is to study the singular natureof the crack-tip stress and electric displacement field in afunctionally gradient piezoelectric medium having materialcoefficients with a discontinuous d... The main objective of this paper is to study the singular natureof the crack-tip stress and electric displacement field in afunctionally gradient piezoelectric medium having materialcoefficients with a discontinuous derivative. The problem isconsidered for the simplest possible loading and geometry, namely,the anti-plane shear stress and electric displacement in -plane oftwo bonded half spaces in which the crack is parallel to theinterface. 展开更多
关键词 functionally gradient material piezoelectric material stress intensityfactors electric dis- placement intensity factors
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Ti/Al_2O_3 Functionally Gradient Material Prepared by the Explosive Compaction/SHS Process 认领 引用 被引量：2
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作者 Yimin LIZiqiao ZHENG 《Journal of Materials Science & Technology》 SCIE EI CAS 1999年第3期271-275,共5页
Ti1Al2O3 Functionally Gradient Material (FGM) was prepared by an explosive compaction/SHS process. Ten sheets of the compounding powder were laminated and pressed to get a green body of FGM. It was then compacted expl... Ti1Al2O3 Functionally Gradient Material (FGM) was prepared by an explosive compaction/SHS process. Ten sheets of the compounding powder were laminated and pressed to get a green body of FGM. It was then compacted explosively By burying the explosive compaction body into a stoichiometric Al/TiO2 mixture and igniting the combustion of the stoichiometric Al/TiO2 mixture, the SHS reaction of the explosive compaction body was initiated by the heat released from the combustion of the stoichiometric Al/TiO2 mixture. In this way, Ti/Al2O3 FGM was synthesized. The adiabatic temperatures of each gradient layer were calculated when the preheating temperatures were 298 K and 1173 K, respectively The microstructure, composition and properties of Ti/Al2O3 FGM and the reaction mechanism of each gradient layer were studied. It was found that Ti/Al2O3 FGM prepared by the explosive compaction/SHS process had a high density and a high microhardness. Its structure, composition and properties showed apparent gradient distribution. The structure of the standard stoichiometric ratio gradient layer of FGM was a network structure. Its reaction mode could be described as follows: Al powder melted first, then the molten Al penetrated into the TiO2 zone and reacted with TiO2, and big pores were left in the original positions of Al powder. The reaction of gradient layers with the addition of Al3O3 as diluents was similar to that of the standard stoichiometric ratio gradient layer, so were their structure and composition. However, the reaction of gradient layers with the addition of Ti as diluents was more complex and the composition deviated slightly from the designed one 展开更多
关键词 Al SHS Ti/Al2O3 Functionally Gradient Material Prepared by the Explosive Compaction/SHS Process
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ANTI-PLANE FRACTURE ANALYSIS OF FUNCTIONALLY GRADIENT MATERIAL INFINITE STRIP WITH FINITE WIDTH 认领 引用
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作者 李永东 贾斌 +2 位作者 张男 戴耀 唐立强 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2006年第6期773-780,共8页
The special case of a crack under mode Ⅲ conditions was treated, lying parallel to the edges of an infinite strip with finite width and with the shear modulus varying exponentially perpendicular to the edges. By usin... The special case of a crack under mode Ⅲ conditions was treated, lying parallel to the edges of an infinite strip with finite width and with the shear modulus varying exponentially perpendicular to the edges. By using Fourier transforms the problem was formulated in terms of a singular integral equation. It was numerically solved by representing the unknown dislocation density by a truncated series of Chebyshev polynomials leading to a linear system of equations. The stress intensity factor （SIF） results were discussed with respect to the influences of different geometric parameters and the strength of the non-homogeneity. It was indicated that the SIF increases with the increase of the crack length and decreases with the increase of the rigidity of the material in the vicinity of crack. The SIF of narrow strip is very sensitive to the change of the non-homogeneity parameter and its variation is complicated. With the increase of the non-homogeneity parameter, the stress intensity factor may increase, decrease or keep constant, which is mainly determined by the strip width and the relative crack location. If the crack is located at the midline of the strip or if the strip is wide, the stress intensity factor is not sensitive to the material non-homogeneity parameter. 展开更多
关键词 functionally gradient material Fourier transform singular integral equation anti-plane fracture stress intensity factor finite-width strip
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Higher order asymptotic fields for mode Ⅰ crack in functionally gradient material 认领 引用 被引量：2
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作者 戴耀 燕秀发 《中国有色金属学会会刊：英文版》 2005年第2期473-477,共5页
Higher order stress fields for a mode Ⅰ crack perpendicular to the direction of property variation in a functionally gradient material(FGM), which has an exponential variation of elastic modulus along the gradient di... Higher order stress fields for a mode Ⅰ crack perpendicular to the direction of property variation in a functionally gradient material(FGM), which has an exponential variation of elastic modulus along the gradient direction, were obtained through an asymptotic analysis. The Poisson’s ratio of the FGMs was assumed to be constant throughout the analysis. The first five terms in the asymptotic expansions of crack tip stress fields were derived to bring out the influence of nonhomogeneity on the structure of the stress field explicitly. The analysis reveals that only the higher order terms in the expansion are influenced by the material nonhomogeneity. Moreover, it can be seen from expressions of higher order stress fields that at least three terms must be considered in the case of FGMs in order to explicitly account for the nonhomogeneity effects on the structure of crack tip stress fields. 展开更多
关键词 功能梯度材料 同质性 高阶应力场 渐近膨胀
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THERMAL STRESSES ANALYSIS OF CERAMIC/METAL FUNCTIONALLY GRADIENT MATERIAL CYLINDER 认领 引用
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作者 吕运冰 张开银 +1 位作者 肖金生 温冬生 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1999年第4期74-78,共5页
In this paper, the composite cylinder system is made of three layers: metal, functionally gradient material (FGM) and ceramics is studied. The formulas of the steady_state temperature distribution and the associate th... In this paper, the composite cylinder system is made of three layers: metal, functionally gradient material (FGM) and ceramics is studied. The formulas of the steady_state temperature distribution and the associate thermal stress distribution in the cylinder are obtained. For ZrO 2/Ti_6Al_4V system, the distribution of steady_state temperature and thermal stress are calculated and discussed. 展开更多
关键词 functionally gradient material thermal stress cylinder
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Method of lines for functionally gradient materials 认领 引用
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作者 戴耀 燕秀发 +2 位作者 王海军 何家文 韩志海 《Journal of Central South University of Technology》 2005年第2期145-149,共5页
The method of lines(MOL) for solving the problems of functionally gradient materials(FGMs) was studied. Navier’s equations for FGMs were derived, and were semi-discretized into a system of ordinary differential (equa... The method of lines(MOL) for solving the problems of functionally gradient materials(FGMs) was studied. Navier’s equations for FGMs were derived, and were semi-discretized into a system of ordinary differential (equations(ODEs)) defined on discrete lines with the finite difference. By solving the system of ODEs, the solutions to the problem can be obtained. An example of three-point bending was given to demonstrate the application of MOL for a crack problem in the FGM. The computational results show that the more accurate results can be obtained with less computational time and resources. The obvious difficulties of numerical method for crack problems in FGMs, such as the effect of material nonhomogeneity and the existence of high gradient stress and strain near a crack tip, can be overcome without additional consideration if this method is adopted. 展开更多
关键词 method of lines functionally gradient material crack stress intensity factor
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Design of DLC/Titanium Alloy Bio-Functionally Gradient Coat 认领 引用
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作者 杨云志 陈治清 《Rare Metals》 SCIE EI CAS 1999年第1期28-33,共6页
The material design is used to direct the magnetron cosputtering process. At first, according to the particularity of functionally gradient coat (FGC) the thermal elastic stress analysis for FGC was carried out based ... The material design is used to direct the magnetron cosputtering process. At first, according to the particularity of functionally gradient coat (FGC) the thermal elastic stress analysis for FGC was carried out based on the plane stress hypothesis. It is obtained that the peak value of plane thermal stress within FGC is only determined by the physical properties of materials of FGC and substrate, the composition distribution coefficient only influences the distribution and trend of plane thermal stress. And the plane thermal stress criterion for design of FGC was presented. Then the plane thermal stress of diamond like carbonitanium alloy FGC was calculated. 展开更多
关键词 Functionally gradient coat Plane thermal stress calculation
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