Papers by Keyword: Functionally Graded Material (FGM)

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Authors: Qing Sen Meng, Shao Ping Chen, Q.L. Wang, Z.A. Munir
Abstract: In this paper, the synthesis of four-layered functionally graded materials (FGMs) samples of (TiB2)pNi/(TiB2)p(Ni+Ni3Al)/ Ni3Al with different metallic substrate (Ni, Cu and Cr-Ni steel) by field-activated and pressure-assisted synthesis process (FAPAS) was investigated. It was shown that the imposition of the electric field and the combustion reaction of Ni3Al is the key for the successful synthesis of the FGMs during process. The exothermal reaction of the powder of nickel and aluminum during combustion enhanced the diffusion bonding in the interfaces subsequently. The microstructure, phase composition of the interfaces and mechanical properties of the graded materials were characterized, which showed indicative formation of firm bonds by the combustion reactive process. The samples have an excellent thermal shock resistance ability and gradient distribution of micro-hardness across the substrate layers and the surface layer.
194
Authors: You Zhen Yu, Yi Qun Sun
Abstract: The problems of functionally graded materials are supposed to be studied incorporating their microstructures. The microelement method proposed here is characterized by this capability. In this work, by using the Fortran source program of microelement method established on the basis of existing finite element method, 3-D dynamic analysis of functionally graded material plates with different openings is performed. It can be known from the numerical results that the shapes and number of openings have a significant influence on natural frequency and basic vibration modes of functionally graded material plates, which is different from the results of homogeneous plates. These results are significant to applications of functionally graded material plates with openings.
18
Authors: Ahmed Zerkane, Khalid El Bikri, Rhali Benamar
Abstract: The present work deals with a homogenization procedure (HP), which is developed to reduce the problem of geometrically nonlinear free vibrations of functionally graded beams (FGB) resting on elastic nonlinear foundation with immovable ends to that of isotropic homogeneous beams with effective bending stiffness and axial stiffness parameters. The material properties of the functionally graded composites examined are assumed to be graded in the thickness direction and estimated through the rule of mixture. The theoretical model is based on the Euler-Bernouilli beam theory and the Von Kármán geometrical nonlinearity assumptions. Hamilton’s principle is applied and a multimode approach is derived to calculate the fundamental nonlinear frequency parameters, which are found to be in a good agreement with the published results.
427
Authors: Ming Lu Wang
Abstract: The governing equation of elastic FGM thin plates was obtained by degenerating the governing equation of viscoelastic FGM thin plates. A Levy solution of a simply supported FGM rectangular plate was gotten. Based on the Levy solution, the influence of considering and ignoring mid-plane stain, due to the inhomogeneous property of the functionally graded materials, on the static responses of the functionally graded materials thin plate is investigated.
574
Authors: Pierre Muller, Jean Yves Hascoet, Pascal Mognol
Abstract: Developments in additive manufacturing add possibilities to produce three-dimensional industrial parts. Nowadays, customized parts can be obtained in short period directly from digital data. One of major recent evolutions of additive manufacturing is the ability to produce functionally graded material (FGM) parts. These materials can be characterized by the variation in composition and structure gradually over the volume. The use of these materials is particularly attractive in fields such as aeronautical or biomedical where the multimaterial parts allow to modify locally mechanical, chemical, physical or biochemical properties. To move from the design to the fabrication of FGM parts, the necessary steps include representation of the part and determination of a manufacturing strategy to control the process.
117
Authors: Lu Wang, Yong Zhao, X.T. Zhu, Y. Wang
Abstract: Silver metal oxides (Ag/MeO) are extensively used as electrical contact materials in switching systems. A contact material with ideal operating parameters is very difficultly fabricated by conventional manufacturing techniques. In this paper, a new electrical contact material characterized by graded distributions of different oxides in Ag matrix was fabricated in order to optimize the distributions of operating parameters in material bulk instead of to enhance synchronously properties of that on contact surface. Two selected metal oxides, NiO and SnO2, were doped into Ag matrices, of which one surface layer NiO 12wt% was doped and another SnO2 12wt%, and the concentrations of NiO and SnO2 were varied gradually in bulk. The electrical contact test results show that the average operating number of NiO doped surface layer of graded Ag composite as contact surface is 4600 under 20A current and 220V AC voltage without melted welding while that of samples doped uniformly with NiO is 2200 under the same testing conditions. However, the average loss of mass due to arc erosion of graded samples is higher than that of uniform samples. We conclude that the functionally graded material (FGM) concept has potential application for electric contact materials.
2616
Authors: Glaucio H. Paulino, Alok Sutradhar
Abstract: This paper presents a Galerkin boundary element method for solving crack problems governed by potential theory in nonhomogeneous media. In the simple boundary element method, the nonhomogeneous problem is reduced to a homogeneous problem using variable transformation. Cracks in heat conduction problem in functionally graded materials are investigated. The thermal conductivity varies parabolically in one or more coordinates. A three dimensional boundary element implementation using the Galerkin approach is presented. A numerical example demonstrates the eáciency of the method. The result of the test example is in agreement with ßnite element simulation results.
367
Authors: Qing Jie Zhang, Peng Cheng Zhai, Run Zhang Yuan
1030
Authors: S. Yoneda, E. Ohta, Yoshikazu Shinohara, T. Kimura, Isao A. Nishida, H.T. Kaibe
731
Showing 1 to 10 of 419 Paper Titles