Stress states at neighboring fibers induced by single-fiber interphase defects

H. S. Choi*, J. D. Achenbach

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


A reduced interphase stiffness of a single fiber (the dissimilar fiber) in a unidirectionally reinforced composite gives rise to stress deviations in its own interphase, as well as in the interphases of neighboring fibers, relative to the stresses in a perfect composite. For transverse loading and an arbitrary cross-sectional distribution of the fibers, a general method is presented to calculate these stress deviations, based on solutions by the boundary element method of boundary integral equations for the dissimilar fiber and neighboring fibers. In this method nearest and next-nearest fibers are taken into account. The interphases are represented by the spring layer model. Detailed numerical results are presented for the special case of a hexagonal array composite. Results are compared for calculations taking into account nearest and next-nearest neighbors. Stresses at the matrix sides of the interphases and energy densities in the interphases have been calculated for the dissimilar fiber and for the next-nearest neighbors. These stresses have also been obtained for the case that the dissimilar fiber has interphase flaws.

Original languageEnglish (US)
Pages (from-to)1555-1570
Number of pages16
JournalInternational Journal of Solids and Structures
Issue number11
StatePublished - Jun 1995

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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