Matrix cracking in transversely loaded fiber composites with compliant interphases

M. Gosz*, B. Moran, J. D. Achenbach

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

Some preliminary results are presented from a study on the effect of interphases on the transverse strength of unidirectional fiber-reinforced composites. It is assumed that a thin reaction zone (intermolecular bonding at the fiber/matrix interface) defines the bond between the fibers and the matrix. A variationally coupled finite element - boundary element method is employed to obtain the mechanical response of a hexagonal unit cell which contains a center fiber and parts of surrounding fibers. For a given interfacial stiffness, the unit cell is loaded until a critical value of the circumferential stress component in the matrix just outside the interface is reached. Under the same applied load, the problem is then solved with a radial matrix crack of a given length at the critical location. The mixed mode stress intensity factors are extracted by evaluating interaction integrals over a finite element domain surrounding the crack tip, and the direction of crack propagation is predicted by a maximum principal stress criterion. The circumferential stress distributions in the matrix just outside the interfaces are then examined to determine future crack nucleation sites.

Original languageEnglish (US)
Title of host publicationDamage Mechanics in Composites
PublisherPubl by ASME
Pages133-140
Number of pages8
Volume150
ISBN (Print)0791811085
StatePublished - 1992
Externally publishedYes
EventWinter Annual Meeting of the American Society of Mechanical Engineers - Anaheim, CA, USA
Duration: Nov 8 1992Nov 13 1992

Other

OtherWinter Annual Meeting of the American Society of Mechanical Engineers
CityAnaheim, CA, USA
Period11/8/9211/13/92

ASJC Scopus subject areas

  • Mechanical Engineering

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