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Flexural and Impact res.stance of FRC/Bamboo Laminate

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Journal of mat.rials Science & Technology 2002年第4期18卷 369-371页

作者： Wu YAOstate key lab.ratory of concrete mat.rials res.arch, Tongji University, Shanghai 200092, China lab. of concrete mat. res. Tongji Univ. Shanghai 200092 China

The flexural and impact res.stance of a newly developed FRC/bamboo laminate have been investigated. The laminate considered in this study was combined with reformed bamboo plate and extruded fiber reinforced cementitious (FRC) sheet. Innovated from the raw bamboo, reformed bamboo showed high tensile strength and high strength to weight ratio. It can not only remarkably strengthen the FRC sheet but also reduce the total weight of the laminate. Flexural and impact load, broken energy, deflection and duration were measured. Test res.lts showed that the flexural strength value for the laminate can be improved to greater than 90 MPa, while the impact res.stance is increased more than 10 times for the laminate when compared with the FRC sheet only.

关键词： Flexural strength Impact FRC/bamboo composite

Smart Behavior of Carbon Fiber Reinforced Cement-based Composite

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Journal of mat.rials Science & Technology 2003年第3期19卷 239-242页

作者： Wu YAO, Bing CHEN Keru WUstate key lab.ratory of concrete mat.rials res.arch, Tongji University, Shanghai 200092, China lab. of concrete mat. res. Tongji Univ. Shanghai 200092 China

The electrical characteristics of cement-based mat.rial can be remarkably improved by the addition of short carbon fibers. Carbon fiber reinforced cement composite (CFRC) is an intrinsically smart mat.rial that can sense not only the stres. and strain, but also the temperature. In this paper, variations of electrical res.stivity with external applied load, and relation of thermoelectric force and temperature were investigated. Test res.lts indicated that the electrical signal is related to the increase in the mat.rial volume res.stivity during crack generation or propagation and the decrease in the res.stivity during crack closure. Moreover, it was found that the fiber addition increased the linearity and reversibility of the Seebeck effect in the cement-based mat.rials. The change of electrical characteristics reflects large amount of informat.on of inner damage and temperature differential of composite, which can be used for stres.-strain or thermal self-monitoring by embedding it in the concrete structures.

关键词： Carbon fiber Cement-based composite Smart mat.rial Seebeck effect

INFLUENCE OF TEMPERATURE-DEPENDENT PROPERTIES ON THERMAL STres.ES res.ONSE AND OPTIMUM DESIGN OF C/M FGMS UNDER THERMAL CYCLIC LOADING

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Journal of Wuhan University of Technology(mat.rials Science) 1997年第4期12卷 7-13页

作者：翟鹏程 state key lab. mat. Synthesis Proc. Wuhan University of Technology Wuhan 430070 China

The influence of temperature-dependent properties on thermal stres.es res.onse and optimum design of newly developed ceramic-metal functionally graded mat.rials under cyclic thermal loaning and high temperature gradient environment is studied. The thermal conductivity of mat.rial is considered to be dependent on the temperature. In this paper, the thermal stres.es res.onse of the mat.rial is calculated rising a nonlinear finite element method. Emphasis is placed on the influence of temperature-dependent properties on the thermal stres.es res.onse characteristics, the thermal stres.es relaxation property and the thermal stres.es history under the different graded compositional distributions and different heat flux magnitudes. Through tile analysis. it is suggested that the influence of temperature-dependent properties can not be neglected In the thermal stres.es res.onse analysis and the optimum design process of the mat.rial must be based on the temperature-dependent thermo-elastic-plastic theory.

关键词： functionally graded mat.rials temperature-dependent properties cyclic thermal loading thermal stres.es res.onse

Influence of Inclusion Shape on Thermoelasto-Plastic Optimun Design of Ceramic Metal Functionally Graded mat.rials

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Journal of Wuhan University of Technology(mat.rials Science) 2001年第1期16卷 19-24,29页

作者：王继辉 state key lab. mat. Synthesis/Proc. Wuhan University of Technology Wuhan 430070 China

A nonlinear finite element method is applied to observe how inclusion shape influence the thermal res.onse of a ceramic-metal functionally graded mat.rial (FGM). The elastic and plastic behaviors of the layers which are two-phase isotropic composites consisting of randomly oriented elastic spheroidal Inclusions and a ductile mat.ix are predicted by cc mean field method. The prediction res.lts show that inclusion shape has remarkable influence on the overall behavior of the composite. The consequences of the thermal res.onse analysis of the FGM are that the res.onse is dependent on inclusion shape and its composition profile cooperatively and that the plastic behavior of each layer should be taken into account in optimum design of a ceramic-metal FGM.

关键词： inclusion shape ceramic-metal functionally graded mat.rial mean field method elastoplastic behavior

Multilayer Film Fabrication and Photoelectric Conversion Property of Two Pyrrolidinofullerene Carboxylic Acid Derivatives

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Chinese Chemical Letters 2000年第2期11卷 161-164页

作者： Tian Xin WEI Jin ZHAI Liang Bing GAN Chun Hui HUANG (state key lab.ratory of Rare Earth mat.rials Chemistry and Applications, PKU-HKU Joint lab.ratory on Rare Earth mat.rials and Bioinorganic Chemistry Peking University, Beijing 100871) state key lab. Rare Earth mat. C. PKU-HKU Jt. Lab. Rare Earth Mat. B. Peking University Beijing 100871 China

Two multilayer films of pyrrolidinofullerene carboxylic acid derivatives, which exhibit photoelectric conversion property, are reported here. The first monolayers were fabricated on hydrophilic indium-tin-oxide (ITO), quartz, and mica by esterification reaction. The multilayers were characterized by contact angle and UV spectrum. The photoelectric conversion properties of both multilayer films were studied.

关键词： self-assembled multilayer film fullerene derivative photoelectric conversion

Relationship between Ballistic Coefficient and Static Mechanical Properties for Armor mat.rials

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Journal of University of Science and Technology Beijing 2001年第1期8卷 53-54页

作者： Junpin Lin, Yong Zhang, Zhi Lin, Guoliang Chen The state key lab.ratory for Advanced Metal mat.rials, University of Science and Technology Beijing, Beijing 100083, China state key lab. Advanced Metal mat. Univ. of Sci. and Technology Beijing Beijing 100083 China

The relationship between the ballistic coefficient and the static mechanical properties of armor mat.rials was studied. The res.lts show that the ballistic coefficient is determined by the strength, hardness and the toughness of mat.rials. According to the Martel rule, the equation of the relationship between ballistic coefficient and static mechanical properties satisfies the following formula: W-s=M(1+NK1C/rho )Hr. From the mixture law of composite, the prerequisite, for which ballistic coefficient has maximum to reinforcement volume fraction, is obtained by the following equation: dWs/Df=b(K(1)rho (0)-K(0)rho (1))H/rho (2)+(a+bK/rho)(H-1-H-0).

关键词： armor mat.rials ballistic coefficient toughness

A New Self-Assembled Monolayer of Fullerene Derivative and ItsPhotoelectric Conversion Property

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Chinese Chemical Letters 1999年第5期10卷 421-424页

作者： Jin ZHAI Tian Xin WEI Jun Hao GE Liang Bing GAN Chun Hui HUANG(state key lab.ratory of Rare Earth mat.rials Chemistry and Applications. Peking University.Beijng 100871) state key lab. Rare Earth mat. C. Peking University Beijing 100871 China

A new self-assembled monolayer (SAM) of fullerene derivative has been fabricated and their photoelectric conversion property has been observed. The SAM was fabricated on indium-tin-oxide (ITO) and quartz by amide bonding. It was characterized bq contact angle, UV spectrum. and cyclic voltammetry. The mild fabrication conditions and the stability of the SAM provides a way to build three-dimensional structure more easily.

关键词： self-assembled monolayer C-60 derivatives photoelectric conversion

Functionalized Ethylene Propylene Rubber Prepared in a Co-Rotating Twin-Screw Extruder and Its Potential in Toughness of PBT

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Journal of Wuhan University of Technology(mat.rials Science) 2001年第3期16卷 60-64页

作者：董丽杰 state key lab. of mat. Synth./Proc. Wuhan University of Technology Wuhan 430070 China

The functionalization of EPR with glycidylmethacrylate(GMA)function by melt free radical grafting in aco-rotating twin-screw extruder is investigated. GMA is used as themonomer, styrene(St)is used as the comonomer in order to enhance thedispersion between EPR and GMA. The potential of using a GMA modifiedEPR(EPR-g-GMA)as the toughness precursor is examined as well. Thepres.nce of EPR-g-GMA reduced the Particle size of the dispersedphase(PBT)along with improved cohesion between EPR and PBT phases.

关键词： toughness PBT EPR-g-GMA

EAM Analysis of the Lattice Parameter Effect in Order-Disorder Transformat.on

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Journal of University of Science and Technology Beijing 2001年第3期8卷 189-194页

作者： Timoth■e Nsongo, Xiaodong Ni, Guoliang Chen state key lab.ratory for Advanced Metals and mat.rials, University of Science and Technology Beijing, Beijing 100083, China Faculty of Science, Physics Department, P. O. Box 69, Brazzaville (CONGO) Applied Scie state key lab. for Adv. Met. mat. Univ. of Sci. and Technol. Beijing Beijing 100083 China

The embedded atom method (EAM) was used to theoretically analyze the effect of the lattice parameter variation on the order-disorder transformat.on in binary alloys. Based on EAM, it is found that only one kind of order-disorder transition (second-order transition) exists for AB alloy. Three groups of order-disorder transformat.on can be observed for the A(3)B or AB(3) compounds. For group I, the order-disorder is a completely first-order transition. For group II, the order-disorder transformat.on is a classical first-order transition. For group III, the order-disorder transformat.on is found to be a second-order transition. The lattice parameter variations have a significant effect on E-2 coefficient, which is related to the ordering energy. These res.lts are in good agreement with experiments.

关键词： order-disorder transformat.on embedded atom method (EAM) phase transformat.on binary alloy