Composite Materials Research Progress

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164 Yuanxin Zhou, Hassan Mahfuz, Vijaya Rangari et al. [31] Xia Y., Wang Y. 2001. An improved dynamic Monte Carlo microscopic numerical constitutive model incorporating thermal-mechanical coupling for unidirectional GRP under tensile impact. Composites Science and Technology 61: 997–1003. [32] Ochiai S., Tokinori K., Osamura K., Nakatani E., Yamatsuta Y. 1991. Stress concentration at a notch-tip in unidirectional metal matrix composites. Metall Trans 22A: 2085–2095. [33] Ochiai S., Osamura K. 1986. Stress distribution in a segmented coating film on metal fiber under tensile loading. Journal of Materials Science 21: 2744-2752. [34] Zhou Y., Jiang D., Xia Y. 2001. Tensile mechanical behavior of T300 and M40J fiber bundles at different strain rates. Journal of Materials Science 36: 919-922. [35] Mahesh S., Hanan J. C., Üstündag E., Beyerlein I. J. 2004. Shear-lag model for a single fiber metal matrix composite with an elasto-plastic matrix and a slipping interface. International Journal of Solids and Structures 41: 4197-4218. [36] Huang W., Nie X., Xia Y. 2003. An experimental study on the in situ strength of SiC fibre in unidirectional SiC/Al composites. Composites Part A: Applied Science and Manufacturing 34: 1161-1166. [37] Zhou Y., Wang Y., Xia Y., Mallick P. K. 2003. An experimental study on the tensile behavior of a unidirectional carbon fiber reinforced aluminum composite at different strain rates. Materials Science and Engineering A, 362: 112-117.
In: Composite Materials Research Progress ISBN: 1-60021-994-2 Editor: Lucas P. Durand, pp. 165-207 © 2008 Nova Science Publishers, Inc. Chapter 5 DAMAGE EVALUATION AND RESIDUAL STRENGTH PREDICTION OF CFRP LAMINATES BY MEANS OF ACOUSTIC EMISSION TECHNIQUES Giangiacomo Minak 1 and Andrea Zucchelli 2 Department of Mechanical Engineering, Alma Mater Studiorum - Università di Bologna, Viale Risorgimento 2, 40135 Bologna, Italia Abstract A new approach that integrates acoustic emission (AE) and the mechanical behaviour of composite materials is presented. Usually AE information is used to evaluate qualitatively the damage progression in order to assess the structural integrity of a wide variety of mechanical elements such as pressure vessels. From the other side, the mechanical information, e.g. the stress-strain curve, is used to obtain a quantitative description of the material behaviour. In order to perform a deeper analysis, a function that combines AE and mechanical information is introduced. In particular, this function depends on the strain energy and on the AE events energy, and it was used to study the behaviour of CFRP composite laminates in different applications: (i) to describe the damage progression in tensile and transversal load testing; (ii) to predict residual tensile strength of transversally loaded laminates (condition that simulates a low velocity impact). Introduction Long fibre reinforced composite laminates are a complex structure at the meso-scale. The fibres embedded in the matrix constitute the lamina and the overlapping of different laminas makes the composite laminate. A consequence of this architecture is the complex behaviour during loading and servicing of components realized by such material, and the multiplicity of different failure mechanisms that determine the damage progression. 1 E-mail address: giangiacomo.minak@unibo.it 2 E-mail address: a.zucchelli@unibo.it
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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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110 W.H. Zhong, R.G. Maguire, S.S.
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112 Reinforcement: Advanced materia
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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
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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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Page 218 and 219: 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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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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