Composite Materials Research Progress

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128 W.H. Zhong, R.G. Maguire, S.S. Sangari et al. [22] http://www.tc.faa.gov/its/cmd/visitors/data/AAR-430/advanced.pdf [23] http://www.quickstep.com.au [24] http://www.sti.nasa.gov/tto/spinoff2001/ip7.html [25] http://www.acm-fn.de/e_start.htm [26] http://www.egr.msu.edu/cmsc/biomaterials/star/star [27] http://www.hexcel.com/Products/Matrix+Products/Other+FRM/HexMC
In: Composite Materials Research Progress ISBN: 1-60021-994-2 Editor: Lucas P. Durand, pp. 129-164 © 2008 Nova Science Publishers, Inc. Chapter 4 AN EXPERIMENTAL AND ANALYTICAL STUDY OF UNIDIRECTIONAL CARBON FIBER REINFORCED EPOXY MODIFIED BY SIC NANOPARTICLE Yuanxin Zhou a , Hassan Mahfuz b , Vijaya Rangari a and Shaik Jeelani a a Center for Advanced Materials at Tuskegee University, Tuskegee, AL, 36088 b Department of Ocean Engineering, Florida Atlantic University, Boca Raton, FL 33431 Abstract In the present investigation, an innovative manufacturing process was developed to fabricate nanophased carbon prepregs used in the manufacturing of unidirectional composite laminates. In this technique, prepregs were manufactured using solution impregnation and filament winding methods and subsequently consolidated into laminates. Spherical silicon carbide nanoparticles (β-SiC) were first infused in a high temperature epoxy through an ultrasonic cavitation process. The loading of nanoparticles was 1.5% by weight of the resin. After infusion, the nano-phased resin was used to impregnate a continuous strand of dry carbon fiber tows in a filament winding set-up. In the next step, these nanophased prepregs were wrapped over a cylindrical foam mandrel especially built for this purpose using a filament winder. Once the desired thickness was achieved, the stacked prepregs were cut along the length of the cylindrical mandrel, removed from the mandrel, and laid out open to form a rectangular panel. The panel was then consolidated in a regular compression molding machine. In parallel, control panels were also fabricated following similar routes without any nanoparticle infusion. Extensive thermal and mechanical characterizations were performed to evaluate the performances of the neat and nano-phased systems. Thermo Gravimetric Analysis (TGA) results indicate that there is an increase in the degradation temperature (about 7 0 C) of the nano-phased composites. Similar results from Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA) tests were obtained. An improvement of about 5 0 C in glass transition temperature (T g) of nano-phased systems were also seen. Mechanical tests on the laminates indicated improvement in flexural strength and stiffness by about 32% and 20% respectively whereas in tensile properties there was a nominal improvement between 7-10%. Finally, micro numerical constitutive model and damage constitutive equations were derived and an analytical approach combining the modified shear-lag model and Monte Carlo
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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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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 154 and 155: 140 Heat Flow (W/g) Heat Flow (W/g)
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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178 Giangiacomo Minak and Andrea Zu
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188 A B E (MPa) D 250000 200000 150
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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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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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