Micromechanical Analysis of Hybrid Composites
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The response of hybrid composites to tensile and transverse loads is studied using a micromechanical analysis. Of particular interest are the effects of matrix viscoelasticity and the properties of the interphase region on the material properties and failure initiation. The tensile response of hybrid composites is studied using a statistical model in which the fiber failure strains are represented with Weibull distributions. A shear lag formulation is used to include the contribution of load transfer to broken fibers to the longitudinal modulus. The transverse tensile response is studied using the rule-ofmixtures. Linear viscoelastic matrix properties are incorporated in both analyses. Results from the analysis indicate that the interphase properties have a negligible effect on the longitudinal failure strain and that the effect of matrix viscoelasticity on the longitudinal tensile response is negligible. The longitudinal failure strains decreased with increasing composite length and carbon to glass volume ratios. For transverse tensile loading, the stress rises more rapidly on the stress strain curve when the strain rate is increased and when the interphase moduli are higher.
