Effect of interface properties on the elastic response of unidirectional fiber composites

Document Type

Conference Proceeding

Date of Original Version



In most analyses of composite materials, the fiber/matrix interface is assumed to exhibit perfect bond conditions which give rise to traction and displacement continuity at the interface. Actual composites, however, it is known that perfect bonding rarely exists. To explore the effects of imperfect interfacial bonds, a numerical micromechanics model is developed. This model is used to study the effect of interfacial stiffness on the macroscopic composite effective elastic properties. In addition, the effects of interfacial stiffness on the microstructural load transfer mechanisms are also evaluated. The model makes use of the composite cylinders geometry which idealizes the composite microstructure in order to define rigorous boundary value problems. These problems are solved numerically using the finite element method for the case Arisymmetric geometrics and non-axisymmetric (harmonic) loading and displacements. An interface stiffness parameter is defined and an interface element is developed. It is shown that varying the interface stiffness can significantly change the macroscopic composite effective clastic properties and the microstructural load transfer mechanisms.

Publication Title, e.g., Journal

International SAMPE Technical Conference



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