Interphase strength of Tl-MMC using a localized stress approach

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This paper determines the fiber/matrix interphase shear strength in a titanium matrix composite using the knowledge of the load corresponding to onset of interface debonding in fiber push-out experiments. Finite element calculations employing an axisymmetric cylinder model of a fiber embedded in the matrix phase are utilized to calculate the interphase stress distribution along the fiber. A region of stress localization along the interface due to geometrical constraints of the fiber push-out test configuration is simulated. The interphase shear strength is defined as the peak of the shear stress localization along the fiber where initial debonding would occur. The calculated strength considers the contribution of the process-induced residual stress field as modified by geometrical constraints of fiber push-out test configuration. Results of the interphase strength obtained using the proposed localized approach are compared with those calculated assuming a uniform distributed shear stress along push-out fibers.

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Composites and functionally graded materials

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