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Creep of Gr/BMI composite laminates in compression



Graduation date: 1994The main source of the time-dependent behavior of fiber-reinforced composites is their polymeric matrix, which causes concerns about their long term durability. Although for composites where organic fibers such as Graphite are used, the fibers are also a contributing factor. A composite material may exhibit an appreciable amount of creep, depending on the state of stress and temperature. Viscoelastic flow in the matrix and internal flaw formation and growth are the main sources of this creep. Thus a study was made on the viscoelastic behavior of GI/BMI fiber reinforced composite.\ud An experimental method for testing a large number of composite materials in compression was developed. The samples were tested according to the test matrix consisting of combinations of static and cyclic loads and temperatures. The fixtures were calibrated to check the validity of measurements and reproducibility of results. Stress gradients were caused by frictional effects between the fixture and samples. The modulus change of samples over a period of time were studied. Bending parameters in samples were measured and analyzed for different stresses, clamping forces, temperatures and time.\ud Mechanical models were used to explain the basic principles behind creep of a viscoelastic material followed by a theoretical explanation and study of creep. The linear and non-linear viscoelastic constants were studied and a methodology to analyze these results was presented. The linear and non-linear constants were used in a prediction model and predictions of a composite creep strain with time were made. Creep data obtained tor [45/0/-45/90]₁₆ for a period of three months were compared to the prediction model

Year: 1994
OAI identifier: oai:ir.library.oregonstate.edu:1957/35897
Provided by: ScholarsArchive@OSU

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  7. (1981). Composite Materials; Mechanics, Mechanical Properties and Fabrication", Applied Science Publishers,
  8. (1988). Composites Design", 4th edition, Think Composites,
  9. (1991). Effects of Elevated Temperature on the Viscoplastic Modeling of Graphite /Polymeric Composites",
  10. (1983). Encyclopedia of Composite Materials and Components", A Wiley-Interscience Publication,
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  12. (1982). Experimental Mechanics of Fiber Reinforced Composite Materials",
  13. Graphpad Software Inc. Version 4.03.
  14. (1981). Hancox,"Fibre composite Hybrid Materials",
  15. (1963). Large Longitudinal Retarded Elastic Deformation of Rubberlike Network Polymers, II : Application ofa General Formulation of Nonliner Response",
  16. (1993). Mechanics of Composite Structures",
  17. (1992). Modeling of Structural Composites for the High Speed Civil Transport", Quarterly Progress Reports I XII submitted to Boeing Commercial Aircraft Company
  18. (1969). On the Characterization of a Nonlinear Viscoelastic Materials", Polymeric Engineering and Science,
  19. (1986). Prediction of the Long-Term Creep Compliance of General Composite Laminates",
  20. (1989). Reference Book for Composite Technology, Editor: S.M. Lee, Technomic Publishers Co.,
  21. (1982). Research Center, "Tough Composite Materials",
  22. (1993). Residual strength Properties of Gr /BMI Composite Laminates After Constant /Cyclic Compression",
  23. (1992). The Nonlinear ViscoelasticlViscoplastic behavior of 1M715260 GraphitelBismaleimide under cyclic loading",
  24. (1983). Viscoelastic behavior of polymer solids",
  25. (1971). Viscoelastic Characterization of a Nonlinear Fiber-Reinforced Plastic",

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