SYMPOSIA PAPER Published: 01 January 1986

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


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.

Author Information

Mandell, JF
Rohr Industries, Inc., Chula Vista, CA
Grande, DH
Rohr Industries, Inc., Chula Vista, CA
Tsiang, T-H
Rohr Industries, Inc., Chula Vista, CA
McGarry, FJ
Rohr Industries, Inc., Chula Vista, CA
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Developed by Committee: D30
Pages: 87–108
DOI: 10.1520/STP35343S
ISBN-EB: 978-0-8031-4963-2
ISBN-13: 978-0-8031-0447-1