Vol.2 No.4 (November 2012)
Fatigue Response of Hybrid Ti/APC-2 Nanocomposite Laminates with Single-Edged Cracks
The aims of this study are to fabricate Ti/APC-2 hybrid composite laminates with and without (W/WO) nanoparticles and to investigate the mechanical properties of Ti/APC-2 laminates with single-edged cracks due to ten-sile and cyclic tests. The composite laminates were three layers with one 0.55 mm thick APC-2 lay-ups covered by two 0.5 mm thick Grand 1 titanium alloy sheets. Nanoparticles SiO2 were dispersed uniformly on the interfaces of APC-2 with the optimal amount of 1 wt%. The stacking sequence of APC-2 was cross-ply [0/90]s. The single-edged cracks were cut by electrical discharge machine, such as 1.5 mm, 3.0 mm, 4.5 mm, and 6.0 mm. The mechanical properties, such as ultimate tensile strength, longitudinal stiffness, of plane composite laminates W/WO nanoparticles were ob-tained from the static tensile tests. Next, the load-displacement diagrams were plotted for the laminates with sin-gle-edged cracks. The fracture toughness of hybrid laminates was obtained. The constant stress amplitude tension-ten- sion cyclic tests were carried out by using load-control mode at a sinusoidal loading wave with frequency of 5 Hz and stress ratio R = 0.1. The received fatigue data were plotted in S-N curves for different single-edged cracks. From the results, for different crack lengths both ultimate strengths of Ti/APC-2 composite laminates and nanocomposite lami-nates are very close. Ti/APC-2 cross-ply nanocomposite laminates have better fatigue resistance than that of laminates without nanoparticles. The longer the crack length is, the more their properties are reduced, and also the fatigue lives shortened.
任明华 , 张哲恺 , 林柏全 (2012) 单边裂缝钛合金/碳纤维/聚醚醚酮奈米复材积层板之疲劳破坏及残留性质探讨。 纳米技术， 2， 59-65. doi: 10.12677/NAT.2012.24011
 F. Erdogan, G. C. Sih. Transactions ASME. Journal of Basic Engineering, 1963, 85D(4): 519-527.
 S. K. Maiti. Unstable edge crack extensions during shearing of bars. Ph.D. Thesis, Indian Institute of Technology, Bombay, 1979.
 S. K. Maiti. Prediction of the path of unstable extension of internal and edge cracks. Journal of Strain Analysis, 1980, 15(4): 155-169.
 G. C. Sih. Some basic problems in fracture mechanics and new concepts. Engineering Fracture Mechanics, 1973, 5(2): 364-377.
 H. C. Wu. Dual failure criterion for plain concrete. Journal of Engineering Mechanics, Division ASCE, 1974, 100: 1167-1181.
 R. J. Nuismer. An energy release rate criterion for mixed mode fracture. International Journal of Fracture, 1975, 11(2): 245-250.
 A. Vlot. Historical overview. In: Fibre Metal Laminates; An introduction. Dordrecht: Kluwer Academic Publishers, 2001.
 R. Marissen. Flight simulation behavior of aramid reinforced aluminum laminates (ARALL). Engineering Fracture Mechanics, 1984, 19(2): 261-277.
 R. Marissen, K. H. Trautmann, J. Foth and H. Nowack. Micocrack growth in aramid reinforceed aluminum laminates (ARALL). In: C. J. Beevers, Ed., Fatigue 84, Proceedings of the 2nd International Conference on Fatigue and Fatigue Thresholds, Vol. 2, EMAS Ltd., Warley, 1984: 1081-1089,.
 R. Marissen. Fatigue mechanisms in ARALL, a fatigue resistant hybrid aluminum aramid composite material. In: R. O. Ritchie, E. A. Starke, Eds., Fatigue 87, Proceedings of the 3rd International Conference on Fatigue and Fatigue Thresholds, Vol. 3, EMAS Ltd., Warley, 1987: 1271-1279,.
 C. T. Lin, F. S. Yang and P. W. Kao. Fatigue behavior of carbon fibre-reinforced aluminum laminates. Composites, 1991, 22(2): 135-141.
 T. L. Anderson. Fracture mechanics: Fundamentals and applications (3rd Edition). Boca Raton: CRC Press, 2005.
 刘俊吾. 钛金属/碳纤维/聚醚醚酮复材积层板之研制与机械性值探讨[D]. 国立中山大学机电所, 2009.
 张哲恺. 钛合金/碳纤维/聚醚醚酮奈米复材积层板之研制与机械性值探讨[D]. 国立中山大学机电所, 2010.