SEDL / STP / STP893-EB / STP35343S

Modified Mircodebonding Test for Direct In Situ Fiber/Matrix Bond Strength Determination in Fiber Composites

Mandell, JF
Principal research associate, graduate student, graduate student and professor, Massachusetts Institute of TechnologyRohr Industries, Inc., CambridgeChula Vista, MACA

Grande, DH
Principal research associate, graduate student, graduate student and professor, Massachusetts Institute of TechnologyRohr Industries, Inc., CambridgeChula Vista, MACA

Tsiang, T-H
Principal research associate, graduate student, graduate student and professor, Massachusetts Institute of TechnologyRohr Industries, Inc., CambridgeChula Vista, MACA

McGarry, FJ
Principal research associate, graduate student, graduate student and professor, Massachusetts Institute of TechnologyRohr Industries, Inc., CambridgeChula Vista, MACA

Pages: 22    Published: Jan 1986

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Abstract

This paper describes a test method for determining the in situ fiber/matrix bond strength of composites. In a sequence of steps, a compressive load is applied to individual fibers oriented normal to a polished surface, and the interface is observed microscopically between loading steps, until debonding occurs. The direct result of a test is the force to produce debonding of a particular fiber. The data are reduced to a nominal interfacial shear strength through a finite-element analysis using a simplified model of the fiber, surrounding matrix, and uniform composite properties beyond the matrix. Bond strength results for a variety of composites range from 23 MPa for E-glass/polyester to 86 MPa for T300/5208 graphite/epoxy. The results are consistent with data available from other test methods.