Developments in Ceramic Materials Research

More documents

Recommendations

Info

198 M. A. Sheik Figure 25. Warp and Fill Fibre Tow geometry with the HITCO composite Unit Cell developed from the optical micrograph with fibre-volume fraction Vf =50 %. In designating an RVE Unit Cell with fibre tows that exhibit orthotropic thermal properties, the regions created with ‘Loft’ and ‘Sweep’ function have been assigned special polar coordinate systems. These have been necessary in order to dictate the fibre orientation and their directional property bias as shown superimposed upon a single fill fibre tow in Figure 26. The assignment of the local polar coordinate system requires selection of a discrete volume or region. This region is then assigned a unique local coordinate system, rectangular or polar, which ever is applicable. To obtain distinct regions, it was imperative to divide bigger regions of the fibre tow into smaller ones from places where the curvature sign was changing. This can be seen in Figure 25 where partitioning sections with lines are visible in both warp and fill fibre tows that run parallel to the lenticular area outline, used for the fibre tow generation with the ‘sweep’ function. After separating these unique regions, different local coordinate systems are created with relevant selection of coordinates for centers of curvature and assigned to each curved section. The concern of the various regions thermally interacting with each other that had arisen in the DLR-XT Unit Cell does not arise here as in the present case of HITCO material, the RVE Unit Cell has been generated as a continuous volume. Therefore, there is no need for any interaction property definition within itself. The need for these interactions may arise when multiple RVE Unit Cells are brought together to form a larger section of the composite lamina or during the stacking to form the prototype laminate. Moreover, the HITCO composite laminate has around 8 to 12 laminae stacked upon each other in various positions with respect to specific features of the weave pattern such as the location of fibre tow crossover points. For through-thickness interaction between the laminae, again, care is needed while assigning thermal properties at the common ‘tied’ surfaces i.e., between master and slave surfaces defined with proper thermal interaction properties. An important aspect of an FE analysis has always been the selection and discretisation density of elements for bringing in the governing equation within the mesh for solution. Having the luxury to selectively ‘mesh’ individual regions, with various element types available, makes the meshing process very thorough and interesting, but at the same time, certain constraints always restrict selection from all available options. The 3D tetrahedral,
Modeling of Thermal Transport in Ceramics Matrix Composites 199 linear diffusion, 4-noded DC3D4 element has been used in the complete RVE Unit Cell model. Figure 26. Material Orientation setup with local polar coordinate system, insets showing curved ends in close-up. Figure 27. Suggested local coarsening in the mesh of HITCO RVE Unit Cell.
Page 3:
DEVELOPMENTS IN CERAMIC MATERIALS R
Page 6 and 7:
Copyright © 2007 by Nova Science P
Page 9 and 10:
PREFACE Ceramics are refractory, in
Page 11 and 12:
Preface ix crystals is discussed. A
Page 13:
Preface xi spectra and the directio
Page 16 and 17:
2 Leslie G. Cecil comprehensive dat
Page 18 and 19:
4 Leslie G. Cecil Ringle et al. (19
Page 20 and 21:
6 Leslie G. Cecil The main architec
Page 22 and 23:
8 Leslie G. Cecil can study “the
Page 24 and 25:
10 Leslie G. Cecil Middleton et al.
Page 26 and 27:
12 Leslie G. Cecil The laser ablate
Page 28 and 29:
14 Leslie G. Cecil There are two ge
Page 30 and 31:
16 Leslie G. Cecil distinct recipes
Page 32 and 33:
18 Leslie G. Cecil second group (Fi
Page 34 and 35:
20 Leslie G. Cecil The Vitzil-Orang
Page 36 and 37:
22 Leslie G. Cecil Table 3. Mahalan
Page 38 and 39:
24 Leslie G. Cecil Ixlú and Ch’i
Page 40 and 41:
26 Leslie G. Cecil structures (D. R
Page 42 and 43:
28 Leslie G. Cecil paste and Macanc
Page 44 and 45:
30 Leslie G. Cecil Bieber, A. M. Jr
Page 46 and 47:
32 Leslie G. Cecil Kepecs, S. M., a
Page 48 and 49:
34 Leslie G. Cecil Schele, L., Grub
Page 50 and 51:
36 Z. C. Li, Z. J. Pei and C. Tread
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
54 T. T. Basiev, V. A. Demidenko, K
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
Page 76 and 77:
62 I, % 100 80 60 40 20 0 T. T. Bas
Page 78 and 79:
Page 80 and 81:
Page 82 and 83:
68 Fluorescence, a.u. 1 T. T. Basie
Page 84 and 85:
70 Fluorescence, a.u. 1 0.1 0.01 0.
Page 86 and 87:
Page 88 and 89:
Page 90 and 91:
Page 92 and 93:
78 k, cm -1 20 18 16 14 12 10 8 6 4
Page 94 and 95:
Page 96 and 97:
82 Photon counts 300 250 200 150 10
Page 98 and 99:
84 Fluorescence, a.u. I transfer ,
Page 100 and 101:
86 ln(I transfer (t)) -4.2 -4.4 -4.
Page 102 and 103:
88 Fluorescence, a.u. I transfer ,
Page 104 and 105:
Page 106 and 107:
Page 108 and 109:
Page 111 and 112:
In: Developments in Ceramic Materia
Page 113 and 114:
Synthesis, Spectroscopic and Magnet
Page 115 and 116:
a c Synthesis, Spectroscopic and Ma
Page 117 and 118:
Page 119 and 120:
Transmission Transmission Transmiss
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Sm (J/Kmol) Sm (J/Kmol) 15 10 5 Syn
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Intensity (a.u.) Intensity (a.u.) 8
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
In: Developments in Ceramic Materia
Page 157 and 158:
The Use of Ceramic Pots in Old Wors
Page 159 and 160:
The Use of Ceramic Pots in Old Wors
Page 161 and 162: The Use of Ceramic Pots in Old Wors
Page 163 and 164: 3.2. Wall-in Positions The Use of C
Page 171 and 172: IACC ( τ ) = t2 ∫ The Use of Cer
Page 175 and 176: where σ res is the scattering cros
Page 179 and 180: D50 0.8 0.7 0.6 0.5 0.4 0.3 The Use
Page 181 and 182: Definition (D50) 1 0.95 0.9 0.85 0.
Page 187 and 188: In: Developments in Ceramic Materia
Page 189 and 190: Modeling of Thermal Transport in Ce
Page 205 and 206: q x = Modeling of Thermal Transport
Page 211: Modeling of Thermal Transport in Ce
Page 223: Modeling of Thermal Transport in Ce
Page 226 and 227: 212 R. Ramesh, H. Kara, Ron Stevens
Page 234 and 235: 220 ε S 33 R. Ramesh, H. Kara, Ron
Page 256 and 257: 242 Development of Display Technolo
Page 258 and 259: 244 Li Chen technology moved to the
Page 260 and 261: 246 Li Chen The continuing evolutio
Page 262 and 263:
248 Li Chen the back contact cathod
Page 264 and 265:
250 Li Chen Figure 3. Vertical side
Page 266 and 267:
252 Li Chen Figure 6. Molybdenum mi
Page 268 and 269:
254 Li Chen Figure 8(a). I-V curve
Page 270 and 271:
256 Li Chen Figure 9. Life time tes
Page 272 and 273:
258 Figure 11(a). Plasma generated
Page 274 and 275:
260 Li Chen [13] C.A. Spindt, K.R.
Page 276 and 277:
262 S. Ardizzone, C. L. Bianchi, G.
Page 278 and 279:
Page 280 and 281:
Page 282 and 283:
Page 284 and 285:
Page 286 and 287:
Page 288 and 289:
Page 290 and 291:
Page 292 and 293:
Page 295 and 296:
A absorption spectra, 66, 67, 77, 7
Page 297 and 298:
correlation function, 156 corrosion
Page 299 and 300:
group membership, 13, 20, 21, 22, 2
Page 301 and 302:
microstructure(s), x, xi, 73, 74, 2
Page 303 and 304:
efraction index, 61 refractive inde
Page 305 and 306:
time, vii, ix, 1, 3, 7, 8, 11, 26,
show all

Developments in Ceramic Materials Research

Create successful ePaper yourself

Delete template?

Save as template?