Developments in Ceramic Materials Research

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208 M. A. Sheik CONCLUSIONS Unit Cell Modelling technique is useful for thermal transport analysis of composites. Based on the DLR-XT Unit Cell modelling with sub-modelling of manufacturing porosities for capturing sequential material degradation and also on just bulk porosity introduction in HITCO, this approach has been shown successfully for even complex weaves like 8-harness satin. A bulk porosity of 11% has been accommodated within the matrix with reduction in the matrix thermal conductivity, managed by using the ‘rule of mixtures’. Comparison of FE analyses results from ABAQUS with the experimental results have shown good agreement, with emphasis to the extent of individual role of different porosities in DLR-XT. In material by HITCO, the variability has been seen due to the variety of stacking orientation and phase shift between the laminas. The increased degrees-of-freedom per RVE Unit Cell has also challenged the computational prowess of the present facilities, prompting the use of parallel computing wisely. REFERENCES [1] A.G. Evans and R. Naslain. High-temperautre Ceramic-Matrix Composites, Vol. I and II, Ceramic Transaction, 57, 1995. [2] K. K. Chawla, Ceramic Matrix Composites, Second Edition, Chapman and Hall, 2003. [3] D. A. G. Bruggemann. Ann. Phy., 24, 1935, p. 636. [4] P. Del Puglia, M. A. Sheikh, An overview of thermal transport models for composites, Proceedings of XXX AIAS (Associazione Italiana per l'Analisi delle Sollecitazioni) Conf., Alghero (Italy), University of Cagliari, Dep. of Ingegneria Meccanica, 2001, pp.687-696. [5] T.J. Lu and J. W. Hutchinson, Effect of matrix cracking on the overall thermal conductivity of fibre-reinforced composites, High-temperature Structural Materials, Editors: R. W. Cahn, A. G. Evans and M. McLean London: Chapman and Hall, London, 1996, pp.177-192. [6] J. W. Klett, V. J. Ervin, D. D. Edie, Finite-element modelling of heat transfer in carbon/carbon composites, Composit. Sci. Technol., 59, 1999, pp. 593-607. [7] M. A. Sheikh, S. Taylor, D. R. Hayhurst, R. Taylor, Microstructural Finite Element Modelling of a Ceramic Matrix Composite to predict Experimental Measurements of its Macro Thermal Properties, Modelling Sim Mater Sci Eng, 9, 2001, pp. 7-23. [8] M. A. Sheikh, S. Taylor, D. R. Hayhurst and R. Taylor, Measurement of Thermal Diffusivity of Isotropic Materials using the Laser Flash Method and its validation by Finite Element Analysis, J. Phys. D: App. Phys. 33, 2000, pp. 1536-1550. [9] V. I. Trefilov. 1995. Ceramic And Carbon Matrix Composites. London: Chapman and Hall. [10] K. K Chawla. 1998. Composite Materials: Science and Engineering (2nd Edition). Springer-Verlag, New York. [11] S. T. Peters. 1998. Handbook of Composites (2nd Edition).Springer - Verlag. [12] F. L. Matthews, R. D. Rawlings. 1994. Composite Materials: Engineering and Science. London: Chapman and Hall.
Modeling of Thermal Transport in Ceramics Matrix Composites 209 [13] D. Hull, T. W. Clyne. 1996. An Introduction to Composite Materials (2nd Edition), Cambridge University Press. [14] E. Behrens, Thermal Conductivities of Composite Materials, Journal of Composite Materials 2 (1968) 2-17. [15] J. K. Farooqi and M. A. Sheikh, Finite Element Modelling of Thermal Transport In Ceramic Matrix Composites, Computational Materials Science, 37, pp. 361-373, 2006. [16] P. Del Puglia, M.A. Sheikh, D.R. Hayhurst, Classification And Quantification Of Initial Porosity In A CMC Laminate, Composites Part A: Applied Science and Manufacturing 35 (2004) 223-230. [17] K. Woo and N. S. Goo, Thermal conductivity of carbon-phenolic 8-harness satin weave composites, Composite Structures, vol. 66, no. 1-4, pp. 521-526, 2004. [18] ABAQUS Version 6.5 Documentation, Hibbit, Carlsson and Sorenson Inc, Providence, RI, 2005.
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DEVELOPMENTS IN CERAMIC MATERIALS R
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Copyright © 2007 by Nova Science P
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PREFACE Ceramics are refractory, in
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Preface ix crystals is discussed. A
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Preface xi spectra and the directio
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2 Leslie G. Cecil comprehensive dat
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4 Leslie G. Cecil Ringle et al. (19
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6 Leslie G. Cecil The main architec
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8 Leslie G. Cecil can study “the
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10 Leslie G. Cecil Middleton et al.
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12 Leslie G. Cecil The laser ablate
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14 Leslie G. Cecil There are two ge
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16 Leslie G. Cecil distinct recipes
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18 Leslie G. Cecil second group (Fi
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20 Leslie G. Cecil The Vitzil-Orang
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22 Leslie G. Cecil Table 3. Mahalan
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24 Leslie G. Cecil Ixlú and Ch’i
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26 Leslie G. Cecil structures (D. R
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28 Leslie G. Cecil paste and Macanc
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30 Leslie G. Cecil Bieber, A. M. Jr
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32 Leslie G. Cecil Kepecs, S. M., a
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34 Leslie G. Cecil Schele, L., Grub
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36 Z. C. Li, Z. J. Pei and C. Tread
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62 I, % 100 80 60 40 20 0 T. T. Bas
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78 k, cm -1 20 18 16 14 12 10 8 6 4
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82 Photon counts 300 250 200 150 10
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84 Fluorescence, a.u. I transfer ,
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86 ln(I transfer (t)) -4.2 -4.4 -4.
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88 Fluorescence, a.u. I transfer ,
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In: Developments in Ceramic Materia
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Synthesis, Spectroscopic and Magnet
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a c Synthesis, Spectroscopic and Ma
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Transmission Transmission Transmiss
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Sm (J/Kmol) Sm (J/Kmol) 15 10 5 Syn
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Intensity (a.u.) Intensity (a.u.) 8
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In: Developments in Ceramic Materia
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The Use of Ceramic Pots in Old Wors
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3.2. Wall-in Positions The Use of C
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258 Figure 11(a). Plasma generated
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260 Li Chen [13] C.A. Spindt, K.R.
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262 S. Ardizzone, C. L. Bianchi, G.
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A absorption spectra, 66, 67, 77, 7
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correlation function, 156 corrosion
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group membership, 13, 20, 21, 22, 2
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microstructure(s), x, xi, 73, 74, 2
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efraction index, 61 refractive inde
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time, vii, ix, 1, 3, 7, 8, 11, 26,
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