Composite Materials Research Progress

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140 Heat Flow (W/g) Heat Flow (W/g) 0.1000 0.0812 0.0625 0.0437 0.0250 0.0062 -0.0125 -0.0313 -0.0500 -0.0688 -0.0815 -0.1063 -0.1250 -0.1438 -0.1625 -0.1812 Yuanxin Zhou, Hassan Mahfuz, Vijaya Rangari et al. -0.2000 50 100 150 200 250 300 350 400 0.0500 0.0188 -0.0816 -0.1563 -0.2250 -0.2938 -0.3625 -0.4312 Temperature (°C) Figure 11. DSC graph of neat prepreg system. -0.5000 50 100 150 200 250 300 350 400 Temperature (°C) Figure 12. DSC graph of 1.5 wt.% SiC nano-phased prepreg system.
An Experimental and Analytical Study of Unidirectional Carbon Fiber… 141 Figure 13. DMA graphs of neat and 1.5 wt.% SiC nano-phased prepreg systems. results, dynamic mechanical analysis (DMA) tests were also carried out under single cantilever test environment. The results indicated the existence of glass transition (Tg) for the nano-phased system which is about 5 0 C higher than the neat counterpart as shown in Figure 13. The increase in Tg may be attributed to a loss in the mobility of chain segments of epoxy resin resulting from the high nanoparticle/matrix interaction. Impeded chain mobility is possible if the nanoparticles are well dispersed in the matrix. The particle surface-to-surface distances (‘matrix bridges’) should then be relatively small and chain segment movement may be restricted. Good adhesion of nanoparticles with the surrounding polymer matrix additionally may have benefited the dynamic modulus by hindering molecular motion to some extend. The hard particles incorporated into the polymer may also have acted as additional virtual ‘‘network nodes’’. In either situation it can be deduced that Tg increased as a result of more number of cross-linked polymer chains and restricted mobility of the chain segments in the presence of SiC nanoparticles. Thermo Gravimetric Analysis Thermo gravimetric analysis (TGA) has been carried out to find the degradation temperature or to estimate the thermal stability of neat and 1.5 wt.% nano-phased prepreg systems. Figure 14 shows that in as-fabricated neat system, the resin decomposed at about 390 0 C which is represented by the peak of the derivative curve. The TGA curve shown in Figure 15 indicated that the decomposition temperature of the nano-phased system was about 397 0 C, which is almost 7 0 C higher than the neat counterpart. From the results it is clear that in nano-phased systems, epoxy was amply cross-linked and had minimum particle-to-particle interaction,
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COMPOSITE MATERIALS RESEARCH PROGRE
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Copyright © 2008 by Nova Science P
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vi Contents Chapter 9 Recent Advanc
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viii Lucas P. Durand scale transiti
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x Lucas P. Durand machine. In paral
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In: Composite Materials Research Pr
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Multi-scale Analysis of Fiber-Reinf
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T300 fibers (Soden et al., 1998; Ag
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1 I L = L : r v Multi-scale Analysi
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I E ⎡0 ⎢ ⎢0 ⎢ ⎢ ⎢ ⎢0
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Applied macroscopic load Correspond
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Optimization of Laminated Composite
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⎧σ x ⎫ ⎡ mE ⎪ ⎪ ⎢ x
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and γ 2 γ 0 Optimization of Lamin
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4 x 10 5 4 3 2 1 Compliance (Nmm) 0
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Page 124 and 125: 110 W.H. Zhong, R.G. Maguire, S.S.
Page 126 and 127: 112 Reinforcement: Advanced materia
Page 144 and 145: 130 Yuanxin Zhou, Hassan Mahfuz, Vi
Page 158 and 159: 144 Material Yuanxin Zhou, Hassan M
Page 160 and 161: 146 SEM Analysis Yuanxin Zhou, Hass
Page 164 and 165: 150 Governing Equation For the fibe
Page 166 and 167: 152 ⎧ UU = ⎨ ⎩ ⎧ UD = ⎨
Page 170 and 171: 156 Stress (MPa) 120 80 40 0 Yuanxi
Page 180 and 181: 166 Giangiacomo Minak and Andrea Zu
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190 D D 1.0 0.9 0.8 0.7 0.6 0.5 0.4
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192 Giangiacomo Minak and Andrea Zu
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204 Conclusion Giangiacomo Minak an
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Research Directions in the Fatigue
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Bending force [N] Research Directio
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Damage Variables in Impact Testing
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F peak [kN] 16 14 12 10 8 6 4 2 0 D
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Eletromechanical Field Concentratio
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MV/m. Eletromechanical Field Concen
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276 S.C. Tjong developed in the pas
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278 S.C. Tjong ultrasonic waves gen
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280 S.C. Tjong applications. Goujon
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282 S.C. Tjong nanoparticles were p
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284 S.C. Tjong where DL is lattice
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286 S.C. Tjong stress is temperatur
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288 S.C. Tjong threshold stress res
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290 S.C. Tjong NC Al, and the NC Al
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292 S.C. Tjong (a) (b) Figure 19. T
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294 S.C. Tjong Apart from forming u
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296 S.C. Tjong [29] Saravanan, M.;
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298 braids, 115 broadband, 211 bubb
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300 endothermic, 139 endurance, 32
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302 isostatic pressing, 279, 288 It
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304 piezoelectricity, 261 pitch, 12
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306 67, 69, 70, 71, 72, 73, 84, 94,
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Composite Materials Research Progress

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