Short-term microdamageability of a fibrous composite with physically nonlinear matrix and microdamaged reinforcement |
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Authors: | L P Khoroshun E N Shikula |
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Institution: | (1) S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of Ukraine, Kiev |
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Abstract: | A structural theory of short-term microdamage is proposed for a fibrous composite with physically nonlinear matrix and microdamaged
reinforcement. The theory is based on the stochastic elasticity equations of a fibrous composite with porous fibers. Microvolumes
of the fiber material are damaged in accordance with the Huber-Mises failure criterion. A balance equation for damaged microvolumes
in the reinforcement is derived. This equation together with the equations relating macrostresses and macrostrains of a fibrous
composite with porous reinforcement and physically nonlinear matrix constitute a closed-form system. This system describes
the coupled processes of physically nonlinear deformation and microdamage that occur in different components of the composite.
Algorithms are proposed for computing the dependences of microdamage on macrostrains and macrostresses on macrostrains. Uniaxial
tension curves are plotted for a fibrous composite with a linearly hardening matrix
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Translated from Prikladnaya Mekhanika, Vol. 42, No. 2, pp. 3–13, February 2006. |
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Keywords: | fibrous composite microdamage of fibers physically nonlinear matrix coupled process of physically nonlinear deformation and microdamage |
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