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Composite structures having a single continuous skin may be formed using automated fiber placement methods. These composite structures include frameless aircraft fuselage components offering an increased interior cabin width over conventional fuselage components. The composite structures may be cons

Composite structures having a single continuous skin may be formed using automated fiber placement methods. These composite structures include frameless aircraft fuselage components offering an increased interior cabin width over conventional fuselage components. The composite structures may be constructed of multiple layers of fibers and other materials placed on a fiber placement tool that includes a mandrel body surrounded by a bladder or an integral bladder/caul sheet having expansion spaces created within the caul sheet section. Uncured composite structures may be created by placing fibers around the fiber placement tool in a plurality of discontinuous segments that are capable of moving or sliding in relation to each other so that the uncured composite structure is expandable from within. Fluid openings may be provided in the outer surface of the mandrel body for the application of vacuum and/or fluid pressure to secure the bladder to the mandrel body and to assist in the removal of the bladder from the mandrel body, respectively. Uncured composite structures may be sealed between the bladder and is clam shell molds. The uncured structures may be expanded against the inner surface of the molds by creating a vacuum between the bladder and molds.

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Composite structures having a single continuous skin may be formed using automated fiber placement methods. These composite structures include frameless aircraft fuselage components offering an increased interior cabin width over conventional fuselage components. The composite structures may be cons

Composite structures having a single continuous skin may be formed using automated fiber placement methods. These composite structures include frameless aircraft fuselage components offering an increased interior cabin width over conventional fuselage components. The composite structures may be constructed of multiple layers of fibers and other materials placed on a fiber placement tool that includes a mandrel body surrounded by a bladder or an integral bladder/caul sheet having expansion spaces created within the caul sheet section. Uncured composite structures may be created by placing fibers around the fiber placement tool in a plurality of discontinuous segments that are capable of moving or sliding in relation to each other so that the uncured composite structure is expandable from within. Fluid openings may be provided in the outer surface of the mandrel body for the application of vacuum and/or fluid pressure to secure the bladder to the mandrel body and to assist in the removal of the bladder from the mandrel body, respectively. Uncured composite structures may be sealed between the bladder and is clam shell molds. The uncured structures may be expanded against the inner surface of the molds by creating a vacuum between the bladder and molds. rs Squibb Company), Warsaw (1977). Atkinson, J.R. et al., "Silane cross-linked polyethylene for prosthetic applications. Part I. Certain physical and mechanical properties related to the nature of the material", Biomaterials, 4:267 (1983). Atkinson, J.R. et al., "Silane cross-liked polyethylene for prosthetic applications. Part II. Creep and wear behavior and a preliminary moulding test", Biomaterials, 5:326 (1984). Bartel, D.L. et al., "The Effect of Comformity, Thickness, and Material on Stresses In Ultra-High Molecular Weight Components for Total Hip Replacement", J. Bone & Joint Surgery, 68-A(7):1041 (1986). Bhateja, S.K., "Radiation-Induced Crystallinity Changes In Pressure-Crystallized Ultra-High Molecular Weight Polyethylene", J. Macromol. Sci. Phys., B22(1): 159 (1983). Bhateja, S.K. et al., "Radiation-Induced Crystallinity Changes in Linear Polyethylene", J. Polym. Sci. Polym. Phys. Ed., 21: 523 (1983). Bhateja, S.K. et al., "Radiation-Induced Crystallinity Changes in Polyethylene Blends", J. Mater. Sci., 20: 2839 (1985). Birkinshaw, C. et al., "The Melting Behavior of Irradiated Polymers", Thermochimica Acta, 117: 365 (1987). Bloebaum, R.D. et al., "Investigation of Early Surface Delamination Observed in Retrieved Heat-Pressed Tibial Inserts", Clin. Orthop., 269: 120 (1991). Bremmer, T. et al., "Peroxide Modification of Linear Low-Density Polyethylene: A Comparison of Dialkyl Peroxides", J. Appl. Polym. Sci., 49 : 785 (1993). Brown, K. J. et al., "The Wear of Ultra-High Molecular Weight Polyethylene with Reference to Its Use in Prostheses", Plastics in Medicine & Surgery Plastics & Rubber Institute, London, 2.1 (1975). Chen, C.J. et al., "Radiation-Induced crosslinking: II. Effect on the crystalline and amorphous densitiies of polyethylene", Coll. & Polym. Sci., 269: 469 (1991). Chen, Y.L. et al., "Photocrosslinking of Polyethylene I. Photoinitiators, Crosslinking Agent, and Reaction Kinetics", J. Polym. Sci., Part A: Polym. Chem. 27: 4051 (1989). Chen, Y.L. et al., "Photocrosslinking of Polyethylene. II. Properties of Photocrosslinked Polyethylene", J. Polym. Sci., Part A; Polym. Chem., 27: 4077 (1989). Connelly, G.M. et al., "Fatigue Crack Propagation Behavior of Ultrahigh Molecular Weight Polyethylene", J. Orthop. Res., 2: 119 (1984). deBoer, A.P. et al., "Polyethylene Networks Crosslinked in Solution: Preparation, Elastic Behavior, and Oriented Crystallization. I. Crosslinking In Solution", J. Polym. Sci., Polym. Phys. Ed., 14: 187 (1976). deBoer, J. et al., "Crosslinking of Ultra-High Molecular Weight Polyethylene in the Melt by Means of 2,5-dimethyl-2,5-bis (tert-butyldioxy)-3-hexyne", Makromol. Chem. Rapid Commun., 2: 749 (1981). deBoer, J. et al., "Crosslinking of Ultra-High Molecular Weight Polyethylene in the Melt by Means of 2,5-dimethyl-2,5-bis (tert-butyldioxy)-3-hexyne: 2. Crystallization Behavior and Mechanical Properties", Polymer, 23: 1944 (1982). deBoer, J. et al., "Crosslinking of Ultra-High Molecular Weight Polyethylene in the Oriented State with Dicumylperoxide", Polymer, 25: 513 (1984). Dijkstra, D.J. et al., "Cross-linking of ultra-high molecular weight polyethylene in the melt by means of electron bean irradiation", Polymer, 30: 866 (1989). Ding Z.Y. et al., "Model Filled Polymers. VI. Determination of the Crosslink Density of Polymeric Beads by Swelling," J. Polym. Sci., Part B: Poly. Phys., 29: 1035 (1991). Eyerer, P. et al., "Property changes of UHMW polyethylene hip cup endoprostheses during implantation", J. Biomed. Materials Res., 18: 1137 (1984). Eyerer, P., "Polyethylene", Concise Encyclopedia of Medical and Dental Implant Materials, Pergamon Press, Oxford, 271 (1990). Ferris, B.D., "A quantitiative study of the tissue reaction and its relationship to debris production from a joint implant", J. Exp. Path., 71: 367 (1990). Gielenz G. et al., "Crystalline and supermolecular structures in linear polyethylene irradiated with fast electrons", Colloid & Polymer Sci., 260: 742 (1982). Grobbelaar, C.J., et al., "The Radiation improvement of Polyethylene Prosthesis", J. Bone & Joint Surgery, 60-B(3): 370-374 (1978). Grood, E.S. et al., "Analysis of retrieved implants: Crystallinity changes in ultrahigh molecular weight polyethylene", J. Biomedical Materials Res., 16: 399 (1982). Huang, D.D. et al., "Cyclic Fatigue Behaviors of UHMWPE and Enhanced UHMWPE", Trans. 38thAnn. Mtg., Orthop. Res. Soc., 403 (1992). Kamel, I. et al., "A Model for Radiation-Induced Changes in Ultrahigh-Molecular-Weight-Polyethylene", J. Polym. Sci., Polym. Phys. Ed., 23:2407 (1985). Kampouris, E.M. et al., "Benzyl Peroxide as a Crosslinking Agent for Polyethylene", J. Appl. Polym. Sci., 34: 1209 (1987). Kao, Y.H., "Crystallinity in chemically crosslinked low density polyethylenes: 1 Structural and fusion studies", Polymer, 27: 1669 (1986). Katq, K. et al., "Structural Changes and Melting Behavior of γ-Irradiated Polyethylene", Japanese J. Appl. Phys., 20: 691 (1981). Kunert, K.A. et al., "Structural investigation of chemically crosslinked low density polyethylene", Polymer, 22: 1355 (1981). Kurth, M. et al., "Effects of Radiation Sterilization on UHMW-Polyethylene", Trans. Third World Biomaterials Congress, 589 (1988). Landy, M.M. et al., "Wear of Ultra-high-molecular-weight Polyethylene Components of 90 Retrieved Knee Prostheses", J. Arthroplasty, Supplement, 3: S73 (1988). Lem, K. et al., "Rheological Properties of Polyethylenes Modified with Dicumyl Peroxide", J. Appl. Polym. Sci., 27: 1367 (1982). Li, S. et al., "Characterization and Description of an Enhanced Ultra High Molecular Weight Polyethylene for Orthopaedic Bearing Surfaces", Trans. 16thAnn. Soc. Biomaterials Meeting, Charleston, SC, 190 (1990). Manley, T.R. et al., "The effects of varying peroxide concentration in crosslinked linear polyethylene", Polymer, 12:176 (1971). McKellop, H. et al., "Friction, Lubrication and Wear of Polyethylene Metal and Polyethylene/Ceramic Hip Prostheses on a Joint Simulator", Fourth World Biomaterials Congress, Berlin, Apr., 118 (1992). Minkova, L., "DSC of γ-irradiated ultra-high molecular weight polyethylene and high density polyethylene of normal molecular weight", Colloid & Polymer Sci., 266: 6 (1988). Minkova, L. et al., "Blends of normal high density and ultra-high molecular weight polyethylene, γ-irradiated at a low dose", Colloid & Polymer Sci., 268: 1018 (1990). Nagy, E.V. et al., "A Fourier transform infrared technique for the evaluation of polyethylene orthopaedic bearing materials", Trans. 16thAnn. Soc. For Biomaterials Meeting, Charleston, SC 109 (1990). Narkis, M. et al., "Structure and Tensile Behavior of Irradiation-and Peroxide-Crosslinked Polyethylene", J. Macromol. Sci.-Phys., B26(1): 37 (1987). Nusbaum, H. J. et al., "The Effects of Radiation Sterilization on the Properties of Ultrahigh Molecular Weight Polyethylene", J. Biomed. Materials Res., 13: 557 (1979). Oonishi, H. et al., "Improvement of Polyethylene by Irradiation in Artificial Joints", Radiat, Phys. Chem., 39: 495 (1992). Oonishi, H. et al., "In Vivo and In Vitro Wear Behavior on Weightbearing Surfaces of Polyethylene Sockets Improved by Irradiation in Total Hip Prostheses", Surface Modification Technologies V, 101-115 (1992), Sudarsahn T.S. et al., ed. The Institute of Materials. Painter, P.C., et al., "The Theory of Vibrational Spectroscopy and its Application to Polymeric Materials", Ed. John Wiley & Sons, New York, U.S.A., (1982). Paul, J. P., "Forces Transmitted by Joints in the Human Body", Proc. Instn. Mech. Engrs. 181, Part 3J, Paper 8 (1966). Qu, B.J. et al., "Photocross-linking of Low Density Polyethylene. I Kinetics and Reaction Parameters", J. Appl. Polym. Sci., 48: 701 (1993). Qu, B.J. et al., "Photocross-linking of Low Density Polyethylene. II Structure and Morphology", J. Appl. Polym. Sci., 48: 711 (1993). Rimnac, C.M. et al., "Chemical and Mechanical Degradation of UHM