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Abstract

The tensile creep behavior of two resins used as matrices in high- performance carbon-fiber-reinforced composites was characterized by using Schapery's nonlinear viscoelastic constitutive equation. The investigation was performed on Poly etheretherketone (PEEK) and a toughened epoxy resin.

Two equations from the micromechanics of composites were modified by involving nonlinear viscoelastic matrix behavior. These modified equations were used to predict the nonlinear creep compliances J ₂₂ and J ₆₆ of carbon-fiber-reinforced composites having the investigated matrices.

The prediction was verified by creep tests on laminates with fiber orientation [90₄]_s and [±45₄]_s.

It was found that the modified equations allow good prediction of the creep compliances J ₂₂ and J ₆₆. The maximum difference between predicted and measured creep strain is less than 12%.

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References

Schapery. R.A. 1966. "A Theory of Nonlinear Thermoviscoelasticity Based on Irreversible Thermodynamics," Proceeding 5th US Nat. Congress. Applied Mechanics. ASME: 511.

Schapery, R.A. 1969. "Further Development of a Thermodynamic Constitutive Theory—Stress Formulation," Purdue University Report No. 69-2 (February).

Lou, Y.C. , R.A. Schapery. 1971. "Viscoelastic Characterization of a Nonlinear Fiber-Reinforced Plastic," J. Composite Materials, 5:208-233.

Mohan, R. and D.F. Adams. 1985. "Nonlinear Creep-Recovery Response of a Polymer Matrix and its Composites," Experimental Mechanics , 9:262-269.

Brinson, D.M. 1981. Creep and Creep Rupture of Laminated Graphite/Epoxy Composites . Virginia Polytechnic Institute and State University Rep. , VPI-E-81-3.

Horoschenkoff, A. , J. Brandt, J. Warnecke and O.S. Brüller . 1988. "Creep Behavior of Carbon-Fiber-Reinforced Potyetheretherketone and Epoxy Resin," New Generation Materials and Processes SAMPE, Milan: Grafische F.B.M.

Brüller, O.S. 1987. ''Nonlinear Characterization of the Long Term Behavior of Potymeric Materials," Polymer Engineering. a. Science, 2:56-90.

Tuttle, M.E. and H.F. Brinson. 1986. "Prediction of the Long-Term Creep Compliance of General Composite Laminates," Experimental Mechanics, 3:89-102.

Schapery, R.A. 1967. "Stress Anaiysis of Viscoelastic Composite Materiats," J. Composite Materials, 1:153-192.

10.

Becker, G.W. , J. Meißner. H. Obert and H. Thum. 1963. Elastische und viskose Eigenschaften von Werkstoffen. Berlin: DVM.

11.

Bardenheier, R. 1982. Mechanisches Versagen von Polymerwerkstoffen. München: Carl Hanser Verlag.

12.

Wellinger, D. 1976. Festigkeitsberechnung. Dortmund: Alfred Kröner Verlag.

Characterization of the Creep Compliances J22 and J66 of Orthotropic Composites with PEEK and Epoxy Matrices Using the Nonlinear Viscoelastic Response of the Neat Resins

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