Damage-enhanced creep and rupture in fiber-reinforced composites
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Engineering Science and Mechanics
The time-dependent deformation of uniaxial composites reinforced with continuous stochastic fibers is examined using a one-dimensional model of a viscoelastic-plastic matrix reinforced with continuous viscoelastic fibers. The important effect of successive fragmentation of the stochastic fibers under increasing load is included using a nonlinear constitutive model of the fiber bundle deformation which accurately includes the stochastic failure of fibers and the influence of fiber/matrix slip around fiber breaks. Matrix yielding and/or cracking are also incorporated into the model. Detailed analyses of three special cases particularly applicable to metal and ceramic composites are presented: a viscoelastic-plastic matrix reinforced (i) with elastic fibers and subjected to a step tensile loading; (ii) with elastic fibers and stretched at a constant rate of extension; and (iii) with viscoelastic fibers and subjected to a step tensile loading. Comparisons of the predicted deformations to recent experimental data on titanium matrix composites show reasonable agreement in the creep rates, failure times and general deformation history.
- OSTI ID:
- 389797
- Journal Information:
- Acta Materialia, Vol. 44, Issue 9; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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