Graphite-fiber-reinforced

James M. Whitney, Geometrical Effects of Filament Twist on the Modulus and Strength of Graphite Fiber-Reinforced Composites, Textile Research Journal, September 1966, pp. 765-770. 

Experimental results are presented that show that high doses of electron radiation combined with thermal cycling can significantly change the mechanical and physical properties of graphite fiber-reinforced polymer-matrix composites. Polymeric materials examined have included 121 °C and 177°C cure epoxies, polyimide, amorphous thermoplastic, and semicrystalline thermoplastics. Composite panels fabricated and tested included four-ply unidirectional, four-ply [0,90, 90,0] and eight-ply quasi-isotropic [0/ 45/90]s. Test specimens with fiber orientations of [10] and [45] were cut from the unidirectional panels to determine shear properties. Mechanical and physical property tests were conducted at cold (-157°C), room (24°C) and elevated (121°C) temperatures. 

Bowles, K.J, (1988). The eorrelation of low-vclocity impact resistance of graphite fiber reinforced composites with matrix properties. In Composite Materials Testing and Design (8th Conference), ASTM STP 972 (J.D, Whitcomb ed.), ASTM, Philadelphia, PA, pp. 124-142. 

Poisson s ratio for the off-axis loaded lamina, v y, can also be derived. The relative tensile modulus, E jEi, shear modulus, Gj jGi2, and Poisson s ratio, v y, are plotted as a function of the angle of rotation, 9, for a glass-fiber-reinforced epoxy lamina and a graphite-fiber-reinforced epoxy lamina in Figures 5.120a and 5.120b, respectively. 

Figure 5.120 Elastic constants for unidirectional (a) glass fiber reinforced epoxy and (b) graphite fiber-reinforced epoxy laminae. Reprinled, by permission, from P. C. Powell and A. J. I. Housz, Engineering with Polymers, pp. 222, 223. Copyrighl 1998 by Stanley Thorned Publishers.

Another example of composites in biomedical applications is graphite-fiber-reinforced bone cement. Self-curing poly(methyl methacrylate), PMMA, is used extensively as a bone cement in orthopedic surgery for fixation of endoprostheses... 

The relevant properties of these materials for the torsional-mechanical analysis are listed in Table 8.11. On the basis of specific elastic modulus and specific shear modulus, the best materials are the graphite-fiber-reinforced epoxy resin, followed by either of the alloys, then the Kevlar fiber-reinforced epoxy. The chopped glass sheet molding compound is obviously not a good choice. 

Ultrahigh-modulus graphite-fiber-reinforced epoxy resin 303 7 0.25 0.006 6 1688 18.30 0.36... 

Use the data below for the erosive wear for alnmina particles impacting on a graphite-fiber-reinforced epoxy resin composite material to determine the four parameters Uf,Us,vi, and Vp in Eq. (P8.1). You may need to look up some additional data and make appropriate assumptions to solve this problem. You may also find a spreadsheet helpful for solving the fom equations with four unknowns. 

Polymer matrix composites [transverse] Graphite fiber-reinforced 0.044... 

Lewis Research Center) rotary engine parts are made from graphite-fiber-reinforced magnesium- An AZ9IC magnesium alloy is reinforced by 30% (vol) graphite fibers. 

Hsiao, Kuang-Ting, et al., Use of Epoxy/Multiwalled Carbon Nanotubes as Adhesives to Join Graphite Fiber Reinforced Polymer Composites, Nanotechnology, vol. 24, July 2003, pp. 791-793. 

Bowles KJ, Frimpong S. Voids effects on the interlaminar shear strength of imidirectional graphite-fiber-reinforced composites. J. Comp. Mater. 1992 26 10 1487-509. 

Sliney, H.E. and Jacobson, T.P., Graphite-Fiber-Reinforced Polyimide Liners of Various Compositions in Plain Spherical Bearings, Proc. 2nd ASLE Inti. Conf. on Solid Lubrication, Denver, Colorado, (15-18 Aug. 1978) ASLE SP-6, p. 258. 

Graphite fiber reinforced polyimide or epoxy CTE matched to ceramic, patented Boeing process available, can be used as ground plane or heat sink Poor dielectric constant, anisotropy and microcracking problems, relatively thick, vias must be insulated... 

The graphite fiber reinforced triaryl-s-triazine ring (TSTR) cross-linked polyimides with ring-chain structures have good mechanical properties at elevated temperatures. On pyrolysis, the TSTR cross-linked polyimides were converted to refractory type materials which are believed to be graphitic type ladder polymers containing some nitrogen in their cyclic structures. 

Graphite Fiber Reinforced TSTR Polyimide Composites (3). 

The flexural strengths (three-point method) of these two unidirectional HMS graphite fiber reinforced TSTR polyimide composites with or without post curing were measured with a universal Instron machine at room temperature and at 316°C. These results are shown in Table II. 

Figure 5. Bunsen burner burning test of graphite fiber reinforced polyimide composites. Key a, TSTR-XL-PI/GrF specimen before test b, TSTR-XL-PI/GrF specimen after test and c, PMR-15-PI/GrF specimen after test.

Graphite fiber reinforced TSTR cross-linked polyimides have good flexural strength at elevated temperatures (316°C). 

Much of the recent work on the friction and wear behavior of polyimides, with and without graphite fiber reinforcement and/or solid lubricant additives, has been conducted by Fusaro ( 1), who has recently reviewed the field (2). Reduction of friction and wear of polyimides by inclusion of graphite fibers, particularly at elevated temperature, is illustrated in a study by Fusaro and Sliney (3). In... 

Carboxyl-Terminated Butadiene-Acrylonitrile-Modifl Epoxy Resin and Its Graphite Fiber-Reinforced Composite... 

---