SEDL / STP / STP1131-EB / STP23716S

Matrix Cracks and Interphase Failure in Transversely Loaded Fiber Composites

Zhu, H
Post-doctoral fellow and professor, Center for Quality Engineering and Failure Prevention, Northwestern UniversityThe University of Tennessee, EvanstonKnoxville, ILTN

Achenbach, JD
Post-doctoral fellow and professor, Center for Quality Engineering and Failure Prevention, Northwestern UniversityThe University of Tennessee, EvanstonKnoxville, ILTN

Pages: 14    Published: Jan 1992

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Abstract

Interphases in a unidirectionally fiber-reinforced composite with hexagonal packing are modeled by the spring-layer model. The composite is subjected to transverse tensile loading. A critical value of the circumferential stress (σ^θ) at the matrix side of the interphase is taken as a criterion for the initiation of radial matrix cracks, while interphase failure is assumed to occur when the interphase strain energy density (U) exceeds a critical value. All numerical calculations have been carried out by the use of the boundary-element method. For a perfect composite, the results show σ^θ and U for various values of the interphase stiffnesses. For a composite that develops radial matrix cracking, U has been computed and the proclivity towards subsequent interphase failure is discussed. Conversely, for a composite that first develops interphase failure, σ^θ has been calculated to determine the tendency towards subsequent radial matrix cracking.